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Celiac Disease & Gluten-Free Diet Forums

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Celiac Disease & Gluten-Free Diet Blogs

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  • Research on South African Celiac Tours
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  • Keating's Not-so-Glutenfree life
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  • Coeliac, or just plain unlucky?
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  • Searchin for a Primary Care Dr. In Redlands That is Knowledgeable about Celiac disease
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  • Celiac-Positive
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  • I love my plant Cactus <3
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  • Living in Japan with Ceoliac Disease
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  • HONG KONG GLUTEN, WHEAT FREE PRODUCTS
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  • Healthy Food Healthy You
  • SydneyT1D - Diabetic and Celiac YouTuber!
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  • SMAS: www.celiac.com
  • gardener1's Blog
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  • JordanBattenSymons' Blog
  • JillianC
  • Sugar's Blog
  • Blanche22's Blog
  • Jason's Blog
  • Gluten-Free Sisters :)
  • Eab12's Celiac Blog
  • ohiodad's Blog
  • Newly Self Diagnosed?
  • misscorpiothing's Blog
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  • Petroguy
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  • WhoKnew?'s Blog
  • Soap Opera Central
  • nurcan's Blog
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  • Mr J's Blog
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  • deetee's Blog
  • CAC's Blog
  • EmilyLinn7's Blog
  • Teri Kiefer's Blog
  • happyasabeewithceliac's Blog
  • quietmorning01's Blog
  • jaimekochan's Blog
  • Cheryl
  • Seosamh's Blog
  • donna mae's Blog
  • Colleen's blog
  • DawnJ's Blog
  • Gluten Challenge
  • twins2's Blog
  • just trying to feel better's Blog
  • Celiac Teen
  • MNBelle blog
  • Gabe351's Blog
  • moosemalibu's Blog
  • Coeliac Disease or Coeliac Sprue or Non Tropical Sprue
  • karalto's Blog
  • deacon11's Blog
  • Nyxie's Blog
  • Swpocket's Blog
  • threeringfilly's Blog
  • Madison Papers: Living Gluten-Free in a Gluten-Full World
  • babinsky's Blog
  • prettycat's Blog
  • Celiac Diagnosis at Age 24 months in 1939
  • Sandy R's Blog
  • mary m's Blog
  • Jkrupp's Blog
  • Oreo1964's Blog
  • keyboard
  • Louisa's Blog
  • Guts & Brains
  • Gluten Free Betty
  • Jesse'sGirl's Blog
  • NewMom's Blog
  • Connie C.'s Blog
  • garden girl's Blog
  • april anne's Blog
  • 4xmom's Blog
  • benalexander60's Blog
  • missmyrtle's Blog
  • Jersey Shore wheat no more's Blog
  • swezzan's Blog
  • aheartsj's Blog
  • MeltheBrit's Blog
  • glutenfreecosmeticcounter
  • Reasons Why Tummy tuck is considered best to remove unwanted belly fat?
  • alfgarrie's Blog
  • SmidginMama's Blog
  • lws' Blog
  • KMBC2014's Blog
  • Musings and Lessons Learned
  • txwildflower65's Blog
  • Uncertain
  • jess4736's Blog
  • deedo's Blog
  • persistent~Tami's Blog
  • Posterboy's Blog
  • jferguson
  • tiffjake's Blog
  • KCG91's Blog
  • Yolo's Herbs & Other Healing Strategies
  • scrockwell's Blog
  • Sandra45's Blog
  • Theresa Marie's Blog
  • Skylark's Blog
  • JessicaB's Blog
  • Anna'sMommy's Blog
  • Skylark's Oops
  • Jehovah witnesses
  • Celiac in Seattle's Blog
  • March On
  • honeybeez's Blog
  • The Liberated Kitchen, redux
  • onceandagain's Blog
  • JoyfulM's Blog
  • keepingmybabysafe's Blog
  • To beer, with love...
  • nana b's Blog
  • kookooto's Blog
  • SunnyJ's Blog
  • Mia'smommy's Blog
  • Amanda's Blog
  • jldurrani's Blog
  • Why choosing Medical bracelets for women online is the true possible?
  • Carriefaith's Blog
  • acook's Blog
  • REAGS' Blog
  • gfreegirl0125's Blog
  • Gluten Free Recipes - Blog
  • avlocken's Blog
  • Thiamine Thiamine Thiamine
  • wilbragirl's Blog
  • Gluten and Maize-Free (gluten-free-MF)
  • Elimination Diet Challenge
  • DJ 14150
  • mnsny's Blog
  • Linda03's Blog
  • GFinDC's Blog
  • Kim UPST NY's Blog
  • cmc's Blog
  • blog comppergastta1986
  • JesikaBeth's Blog
  • Melissa
  • G-Free's Blog
  • miloandotis' Blog
  • Confessions of a Celiac
  • Know the significance of clean engine oil
  • bobhayes1's Blog
  • Robinbird's Blog
  • skurtz's Blog
  • Olivia's Blog
  • Jazzdncr222's Blog
  • Lemonade's Blog
  • k8k's Blog
  • celiaccoach&triathlete's Blog
  • Gluten Free Goodies
  • cherbourgbakes.blogspot.com
  • snow dogs' Blog
  • Rikki Tikki's Blog
  • lthurman1979's Blog
  • Sprue that :)'s Blog
  • twinkletoes' Blog
  • Ranking the best gluten free pizzas
  • Gluten Free Product
  • Wildcat Golfer's Blog
  • Becci's Blog
  • sillyker0nian's Blog
  • txplowgirl's Blog
  • Gluten Free Bread Blog
  • babygoose78's Blog
  • G-freegal12's Blog
  • kelcat's Blog
  • Heavy duty 0verhead crane
  • beckyk's Blog
  • pchick's Blog
  • NOT-IN-2gluten's Blog
  • PeachPie's Blog
  • Johny
  • Breezy32600's Blog
  • Edgymama's Gluten Free Journey
  • Geoff
  • audra's Blog
  • mfrklr's Blog
  • 2 chicks
  • I Need Help With Bread
  • the strong one has returned!
  • sabrina_B_Celiac's Blog
  • Gluten Free Pioneer's Blog
  • Theanine.
  • The Search of Hay
  • Vanessa
  • racecar16's Blog
  • JCH13's Blog
  • b&kmom's Blog
  • Gluten Free Foodies
  • NanaRobin's Blog
  • mdrumr8030's Blog
  • Sharon LaCouture's Blog
  • Zinc, Magnesium, and Selenium
  • sao155's Blog
  • Tabasco's Blog
  • Amanda Smith
  • mmc's Blog
  • xphile1121's Blog
  • golden exch
  • kerrih's Blog
  • jleb's Blog
  • RUGR8FUL's Blog
  • Brynja's Grain Free Kitchen
  • schneides123's Blog
  • Greenville, SC Gluten-Free Blog
  • ramiaha's Blog
  • Kathy P's Blogs
  • rock on!'s Blog
  • Carri Ninja's Blog
  • jerseygirl221's Blog
  • Pkhaselton's Blog
  • Hyperceliac Blog
  • abbiekir's Blog
  • Lasister's Thoughts
  • bashalove's Blog
  • Steph1's Blog
  • Etboces
  • Rantings of Tiffany
  • GlutenWrangler's Blog
  • kalie's Blog
  • Mommy Of A Gluten Free Child
  • ready2go's Blog
  • Maureen
  • Floridian's Blog
  • Bobbie41972's Blog
  • Everyday Victories
  • Intolerance issue? Helpppp!
  • Feisty
  • In the Beginning...
  • Cheri46's Blog
  • Acne after going gluten free
  • sissSTL's Blog
  • Elizabeth19's Blog
  • LindseyR's Blog
  • sue wiesbrook's Blog
  • I'm Hungry's Blog
  • badcasper's Blog
  • M L Graham's Blog
  • Wolicki's Blog
  • katiesalmons' Blog
  • CBC and celiac
  • Kaycee's Blog
  • wheatisbad's Blog
  • beamishmom's Blog
  • Celiac Ninja's Blog
  • scarlett54's Blog
  • GloriaZ's Blog
  • Holly F's Blog
  • Jackie's Blog
  • lbradley's Blog
  • TheSandWitch's Blog
  • Ginger Sturm's Blog
  • The Struggle is Real
  • whataboutmary's Blog
  • JABBER's Blog
  • morningstar38's Blog
  • Musings of a Celiac
  • Celiacchef's Blog
  • healthygirl's Blog
  • allybaby's Blog
  • MGrinter's Blog
  • LookingforAnswers15's Blog
  • Lis
  • Alilbratty's Blog
  • 3sisters' Blog
  • MGrinter's Blog
  • Amanda
  • felise's Blog
  • rochesterlynn's Blog
  • mle_ii's Blog
  • GlamourGetaways' Blog
  • greendog's Blog
  • Tabz's Blog
  • Smiller's Blog
  • my vent
  • newby to celiac?'s Blog
  • siren's Blog
  • myraljo's Blog
  • Relieved and confused
  • carb bingeing
  • scottish's Blog
  • maggiemay832's Blog
  • Cristina Barbara
  • ~~~AnnaBelle~~~'s Blog
  • nikky's Blog
  • Suzy-Q's Blog
  • mfarrell's Blog
  • Kat-Kat's Blog
  • Kelcie's Blog
  • cyoshimit's Blog
  • pasqualeb's Blog
  • My girlfriend has celiacs and she refuses to see a doctor
  • Ki-Ki29's Blog
  • mailmanrol's Blog
  • Sal Gal
  • WildBillCODY's Blog
  • Ann Messenger
  • aprilz's Blog
  • the gluten-free guy
  • gluten-free-wifey's Blog
  • Lynda MEADOWS's Blog
  • mellajane's Blog
  • Jaded's Celiac adventures in a non-celiac world.
  • booboobelly18's Blog
  • Dope show
  • Classic Celiac Blog
  • Keishalei's Blog
  • Bada
  • Sherry's blurbs
  • addict697's Blog
  • MIchael530btr's Blog
  • Shawn C
  • antono's Blog
  • Undiagnosed
  • little_d's Blog
  • Gluten, dairy, pineapple
  • The Fat (Celiac) Lady Sings
  • Periomike
  • Sue Mc's Blog
  • BloatusMaximus' Blog
  • It's just one cookie!
  • Kimmy
  • jacobsmom44's Blog
  • mjhere's Blog
  • tlipasek's Blog
  • You're Prescribing Me WHAT!?!
  • Kimmy
  • nybbles's Blog
  • Karla T.'s Blog
  • Young and dealing with celiacs
  • Celiac.com Podcast Edition
  • LCcrisp's Blog
  • ghfphd's allergy blog
  • https://www.bendglutenfree.com/
  • Costume's and GF Life
  • mjhere69's Blog
  • dedeadge's Blog
  • CeliacChoplin
  • Ravenworks' Blog
  • ahubbard83's Blog
  • celiac<3'sme!'s Blog
  • William Parsons
  • Gluten Free Breeze (formerly Brendygirl) Blog
  • Ivanna44's Blog
  • Daily Life and Compromising
  • Vonnie Mostat
  • Aly'smom's Blog
  • ar8's Blog
  • farid's Blog
  • Sandra Lee's Blog
  • Demertitis hepaformis no Celac
  • Vonnie Mostat, R.N.
  • beetle's Blog
  • Sandra Lee's Blog
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  • totalallergyman's Blog
  • Kim
  • Vhips
  • twinsmom's Blog
  • Newbyliz's Blog
  • collgwg's Blog
  • Living in the Gluten Free World
  • lisajs38's Blog
  • Mary07's Blog
  • Treg immune celsl, short chain fatty acids, gut bacteria etc.
  • questions
  • A Blog by Yvonne (Vonnie) Mostat, RN
  • ROBIN
  • covsooze's Blog
  • HeartMagic's Blog
  • electromobileplace's Blog
  • Adventures of a Gluten Free Mom
  • Fiona S
  • bluff wallace's Blog
  • sweetbroadway's Blog
  • happybingf's Blog
  • Carla
  • jaru24's Blog
  • AngelaMH's Blog
  • collgwg's Blog
  • blueangel68's Blog
  • SimplyGF Blog
  • Jim L Christie
  • Debbie65's Blog
  • Alcohol, jaundice, and celiac
  • kmh6leh's Blog
  • Gluten Free Mastery
  • james
  • danandbetty1's Blog
  • Feline's Blog
  • Linda Atkinson
  • Auntie Lur: The Blog of a Young Girl
  • KathyNapoleone's Blog
  • Gluten Free and Specialty Diet Recipes
  • Why are people ignoring Celiac Disease, and not understanding how serious it actually is?
  • miasuziegirl's Blog
  • KikiUSA's Blog
  • Amyy's Blog
  • Pete Dixon
  • abigail's Blog
  • CHA's Blog
  • Eczema or Celiac Mom?'s Blog
  • Thoughts
  • International Conference on Gastroenterology
  • Deedle's Blog
  • krackers' Blog
  • cliniclfortin's Blog
  • Mike Menkes' Blog
  • Juanita's Blog
  • BARB OTTUM
  • holman's Blog
  • It's EVERYWHERE!
  • life's Blog
  • writer ann's Blog
  • Ally7's Blog
  • Gluten Busters: Gluten-Free Product Alerts by Celiac.com
  • K Espinoza
  • klc's Blog
  • Pizza&beer's Blog
  • CDiseaseMom's Blog
  • sidinator's Blog
  • Dr Rodney Ford's Blog
  • How and where is it safe to buy cryptocurrency?
  • lucedith's Blog
  • Random Thoughts
  • Kate
  • twin#1's Blog
  • myadrienne's Blog
  • Nampa-Boise Idaho
  • Ursa Major's Blog
  • bakingbarb's Blog
  • Does Celiac Cause Sensitivites To Rx's?
  • delana6303's Blog
  • psychologygrl25's Blog
  • Alcohol and Celiac Disease
  • How do we get it???
  • cooliactic_BOOM's Blog
  • GREAT GF eating in Toronto
  • Gluten-free Food Recommendations!
  • YAY! READ THIS!!
  • BROW-FREE DIET BLOG
  • carib168's Blog
  • A Healing Kitchen
  • Shawn s
  • AZ Gal's Blog
  • mom1's Blog
  • The Beginning - The Diagnosis
  • PeweeValleyKY's Blog
  • solange's Blog
  • Cate K's Blog
  • Layered Vegetable Baked Pasta (gluten-free Vegetarian Lasagna)
  • Gluten Free Teen by Ava
  • mtdawber's Blog
  • sweeet_pea's Blog
  • DCE's Blog
  • Infertility and Celiac Disease
  • What to do in the Mekong Delta in 1 Day?
  • glutenfreenew's Blog
  • Living in the Garden of Eden
  • toddzgrrl02's Blog
  • redface's Blog
  • Gluten Free High Protein
  • Ari
  • Great Harvest Chattanooga's Blog
  • CeliBelli's Blog
  • Aboluk's Blog
  • redface's Blog
  • Being in Control of Your Gluten-Free Diet on a Cruise Ship
  • jayshunee's Blog
  • lilactorgirl's Blog
  • Yummy or Yucky Gluten-Free Foods
  • Electra's Blog
  • Cocerned husband's Blog
  • lilactorgirl's Blog
  • A Little History - My Celiac Disease Diagnosis
  • How to line my stomach
  • sewfunky's Blog
  • Oscar's Blog
  • Chey's Blog
  • The Fun of Gluten-free Breastfeeding
  • Dawnie's Blog
  • Sneaky gluten free goodness!
  • Chicago cubs shirts- A perfect way of showing love towards the baseball team!
  • Granny Garbonzo's Blog
  • GFzinks09's Blog
  • How do I get the Celiac.com podcast on my mp3 player?
  • quantumsugar's Blog
  • Littlebit's Blog
  • Kimberly's Blog
  • Dayz's Blog
  • Swimming Breadcrumbs and Other Issues
  • Helen Burdass
  • celiacsupportnancy's Blog
  • Life of an Aggie Celiac
  • kyleandjra.jacobson's Blog
  • Hey! I'm Not "Allergic" to Wheat!
  • FoOdFaNaTic's Blog
  • Wendy Cohan, RN's Gluten-Free and Dairy-Free Cooking Classes
  • Lora Derry
  • Dr. Joel Goldman's Blog
  • The Ultimate Irony
  • Lora Derry
  • ACK514's Blog
  • katinagj's Blog
  • What Goes On, Goes In (Gluten in Skin Care Products)
  • cannona3's Blog
  • citykatmm's Blog
  • Adventures in Gluten-Free Toddling
  • tahenderson67's Blog
  • The Dinner Party Drama—Two Guidelines to Assure a Pleasant Gluten-Free Experience
  • sparkybear's Blog
  • justbikeit77's Blog
  • To "App" or Not to "App": The Use of Gluten Free Product List Computer Applications
  • Onangwatgo
  • Raine's Blog
  • lalla's Blog
  • To die for Cookie Crumb Gluten-Free Pie Crust
  • DeeTee33's Blog
  • http://glutenfreegroove.com/blog/
  • David2055's Blog
  • Gluten-Free at the Fancy Food Show in San Francisco
  • Kup wysokiej jakości paszporty, prawa jazdy, dowody osobiste
  • Janie's Blog
  • Managing Hives & Gluten Allergies
  • Bogaert's Blog
  • Janie's Blog
  • RaeD's Blog
  • Dizzying Disclaimers!
  • Dream Catcher's Blog
  • PinkZebra's Blog
  • Hibachi Food and Hidden Gluten Hazards (How to Celebrate Gluten-Free)
  • jktenner's Blog
  • OhSoTired's Blog
  • PinkZebra's Blog
  • gluten-free Lover's Blog
  • Gluen Free Health Australia
  • Melissamb21's Blog
  • Andy C's Blog
  • halabackgirl9129's Blog
  • Liam Edwards' Blog
  • Celiac Disease in Africa?
  • Suz's Blog
  • Gluten-Free Fast Food
  • Eldene Goosen
  • mis_chiff's Blog
  • gatakat's Blog
  • macocha's Blog
  • Newly Diagnosed Celiacs Needed for Study in Chicago
  • Elaine Anne
  • Poor Baby's Blog
  • the loonie celiac's Blog
  • jenlex's Blog
  • Sex Drive/Testosterone can be Depleted by Certain Foods
  • Sharon
  • samantha79's Blog
  • 21 Months into the Gluten-free Diet
  • WashingtonLady's Blog-a-log
  • James S. Reid's Blog
  • Living with a Gluten-Free Husband
  • Diane King
  • runner girl's Blog
  • kp3972's Blog
  • ellie_lynn's Blog
  • trayne91's Blog
  • Gluten-free Lipstick!
  • Debado
  • Nonna2's Blog
  • Schar Chocolate Hazelnut Bar (Gluten-Free)
  • Diane
  • pnltbox27's Blog
  • Live2BWell's Blog
  • melissajohnson's Blog
  • nvsmom's Blog
  • Diagnosed with Celiac Disease and Still Sick
  • Coming out having gluten intolerance and celiac disease
  • snowcoveredheart's Blog
  • Gluten Free Nurse
  • Gluten-Free Frustration!
  • Jordan23
  • Melody A's Blog
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Found 19 results

  1. Celiac.com 08/08/2022 - Celiac disease is triggered by digestion-resistant gluten peptides that carry immunogenic epitopes. Sourdough fermentation has shown promise in reducing the concentration of gluten peptides within food. However, researchers don't know much about the effect of partial sourdough fermentation on immunogenic gluten. A team of researchers recently set out to examine the effect of a single sourdough culture, much like those commonly consumed in commercial products, on the digestion of immunogenic gluten peptides. The research team included Olivia J. Ogilvie; Juliet A. Gerrard; Sarah Roberts; Kevin H. Sutton; Nigel Larsen; and Laura J. Domigan. They are variously affiliated with the School of Biological Sciences, University of Canterbury, 20 Kirkwood Avenue, Upper Riccarton, Christchurch in New Zealand; the Riddet Institute, Massey University, Private Bag in Palmerston North, New Zealand; the School of Biological Sciences, University of Auckland, Private Bag in Auckland, New Zealand; The New Zealand Institute for Plant & Food Research Limited, Private Bag in Christchurch Mail Centre, Christchurch 8140, New Zealand; and the Department of Chemical and Materials Engineering, University of Auckland, Private Bag Auckland 1142, New Zealand. The team used the INFOGEST protocol to digest sourdough bread. Across the entire the digestion process, they used quantitative and discovery mass spectrometry to model the kinetic release profile of key immunogenic peptides, and to profile novel peptides, while using ELISA to assess the allergenicity of gluten. Additionally, they performed macrostructural studies. As it turns out, sourdough fermentation changed the protein structure, in vitro digestibility, and immunogenic peptide release profile of certain peptides. Interestingly, sourdough fermentation did not reduce overall concentration of immunogenic peptides, but it did change the in vitro digestion profile of certain peptides. The team's effort shows that partial sourdough fermentation can change immunogenic gluten digestion. Theirs is the first study to assess the in vitro kinetic profile of immunogenic gluten peptides from sourdough bread. The idea that the celiac immune reaction to immunogenic gluten peptides can be reduced using sourdough fermentation is an intriguing one. Stay tuned for more on this and related stories. Read more in Nutrients 2021, 13(6), 1906
  2. Celiac.com 02/10/2008 - Researchers have found a 10mer durum wheat peptide capable of shifting a Th1 gluten-intolerant T cell response to a Th2 gluten-tolerant T cell response in intestinal T cell cultures derived from celiac disease children and incubated with deamidated gliadin peptides. Durum wheat peptides could potentially treat celiac disease by causing celiac disease associated T cells to react tolerantly to gluten. In the study, incubation of the T cell cultures with deamidated gliadin peptides resulted in a significant increase in T cell proliferation and interferon-gamma release. Simultaneous exposure to duram wheat peptides totally abolished the cell proliferation and cytokine release while maintaining an elevated release of interleukin-10 (IL-10). The workings of the immune system are too complex to discuss here in detail. Basically when a "pre-helper" CD4-type T cell is presented with an epitope from an antigen (gliadin), the T cell becomes activated and responds to the stimulus by becoming either a type 1 or type 2 helper T cell which in turn releases different subsets of cytokines. The Th1 path promotes mucosal tissue destruction in celiac disease while the Th2 path initiates proliferation of gluten and tTGase antibodies. Th1 and Th2 cytokines each have properties which act in a feedback loop to suppress, limit, and regulate each other's cytokine secretions, i.e. Th1 cytokines suppress Th2 cytokine secretion and vice vesa. Overactivity of either a Th1 or a Th2 response can result in an autoimmune condition. Researchers theorize that balancing Th1/Th2 response can ameliorate and control symptoms and disease progression in at least some autoimmune diseases. Th1 response includes release of the cytokine interferon-gamma which differentiates and activates macrophages. Th2 response can include the release of IL-10, a cytokine which suppresses inflammation and promotes antigen tolerance. Various molecules have been demonstrated to shift Th1/Th2 response in various autoimmune disorders. In the durum wheat study, the presence of the durum wheat peptide in the gliadin peptide incubated celiac intestinal T cell culture increased Th2 IL-10 release and stopped T cell proliferation and Th1 interferon-gamma release. Hence, this durum wheat peptide may be useful as a celiac disease therapy. How effective this treatment may be is unknown at this time. Below is an example of sodium benzoate being used to shift Th1 to Th2 response in a mouse model of multiple sclerosis which improved symptoms and disease progression when fed to the mice orally. This suggests that the durum wheat peptide could potentially treat celiac disease by simply being administered as an oral supplement. However, if a probiotic bacteria could be genetically engineered to continuously secrete a form of this durum wheat peptide in the gut, this could result in essentially a "cure" for celiac disease if the durum wheat peptide proves effective. ---------- Am J Clin Nutr. 2008 Feb;87(2):415-23. A 10-residue peptide from durum wheat promotes a shift from a Th1-type response toward a Th2-type response in celiac disease. Silano M, Di Benedetto R, Maialetti F, De Vincenzi A, Calcaterra R, Trecca A, De Vincenzi M. Division of Food Science, Human Nutrition and Health, Istituto Superiore di Sanita, Rome, Italy. http://www.ajcn.org/cgi/content/abstract/87/2/415 ---------- J Immunol. 2007 Jul 1;179(1):275-83. Sodium benzoate, a food additive and a metabolite of cinnamon, modifies T cells at multiple steps and inhibits adoptive transfer of experimental allergic encephalomyelitis. Brahmachari S, Pahan K. Department of Neurological Sciences, Rush University Medical Center, 1735 West Harrison Street, Chicago, IL 60612, USA. http://www.jimmunol.org/cgi/content/abstract/179/1/275 * * *

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  4. Celiac.com 05/08/2007 - One of the strategies for developing alternative therapies for treating celiac disease centers on the identification of antagonist peptides that might inhibit the abnormal immune response caused by gliadin peptides in celiac disease. A recent study published in the journal Pediatric Research indicates that a peptide that occurs naturally in durum wheat may protect against the effects of celiac disease by acting as an antagonist against gliadin peptides associated with abnormal immune response. The study was conducted by a team of Italian researchers made up of Drs. Marco Silano, Rita DiBenedetto, Antonello Trecca, Gioachhino Arrabiato, Fabiana Leonardi, Massimo De Vincenzi. The research team set out to assess the antagonistic effects of 10mer, a decapeptide (sequence QQPQDAVQPF) from the alcohol–soluble protein portion of durum wheat, and to evaluate its prospects for preventing gliadin peptides from activating celiac peripheral blood lymphocytes. The team extracted peripheral blood mononuclear cells from children with celiac disease who tested DQ2-positive, and from a healthy control group. These samples were then incubated with the peptic-tryptic digest of bread wheat gliadin (GLP) and peptide 62-75 from [alpha]-gliadin, both alone and separately with 10mer. PBMC proliferation, release of pro-inflammatory Th1 cytokines interferon-[gamma] and tumor necrosis factor-[alpha], release of immuno-regulatory cytokine IL-10, and analysis of CD25 expression as indexes of lymphocytes activation were performed. Exposure to wheat gliadin peptide and peptide 62-75 from [alpha] gliadin both showed increased activation of lymphocytes. However, the incubation samples with 10mer showed inhibited lymphocyte action. The study indicates that naturally occurring peptide 10mer in durum wheat may protect against lymphocyte activity in patients with celiac disease, and that further study and evaluation of these findings is warranted. Pediatric Research. 61(1):67-71, January 2007.
  5. Celiac.com 08/15/2019 - Does the cystic fibrosis transmembrane conductance regulator play a pathogenic role in celiac disease? Usually, when people consume dietary proteins, their guts prevent local inflammatory and immune responses, and encourage oral tolerance to the proteins. However, for about one out of a hundred people worldwide, gluten and related cereals trigger an HLA DQ2/8-restricted TH immune and antibody response, which develops into celiac disease, if untreated. Prior epithelial stress and innate immune activation are required to break oral tolerance to gliadin. How gliadin subverts host intestinal mucosal defenses remains elusive. Does the cystic fibrosis transmembrane conductance regulator play a pathogenic role in celiac disease? A team of researchers recently set out to shed some light on the way gliadin subverts host intestinal mucosal defenses. The research team included Valeria R Villella, Andrea Venerando, Giorgio Cozza, Speranza Esposito, Eleonora Ferrari, Romina Monzani, Mara C Spinella, Vasilis Oikonomou, Giorgia Renga, Antonella Tosco, Federica Rossin, Stefano Guido, Marco Silano, Enrico Garaci, Yu-Kai Chao , Christian Grimm, Alessandro Luciani, Luigina Romani, Mauro Piacentini, Valeria Raia, Guido Kroemer & Luigi Maiuri. Their team demonstrated that the a-gliadin-derived LGQQQPFPPQQPY peptide (P3–43) inhibits the function of cystic fibrosis transmembrane conductance regulator (CFTR), an anion channel pivotal for epithelial adaptation to cell-autonomous or environmental stress. P3–43 binds to, and reduces ATPase activity of, the nucleotide-binding domain- (NBD) of CFTR, thus impairing CFTR function. This creates epithelial stress, tissue transglutaminase and inflammasome activation, NF-jB nuclear translocation and IL-5 production, that all can be prevented by potentiators of CFTR channel gating. The CFTR potentiator VX-770 reduces gliadin-induced inflammation and promotes tolerance in gluten-sensitive mice and cells from patients with celiac disease. The team's results show that CFTR plays an early and crucial role in guiding gliadin activities, and reveals a new therapeutic possibility for treating celiac disease. Stay tuned for more developments on this and related stories. Read more at the EMBO Journal (209) 38: e000 The researchers are variously affiliated with the European Institute for Research in Cystic Fibrosis, San Raffaele Scientific Institute, Milan, Italy; the Department of Comparative Biomedicine and Food Science, University of Padova, Padova, Italy; the Department of Molecular Medicine, University of Padova, Padova, Italy; the Department of Health Sciences, University of Eastern Piedmont, Novara, Italy; the Department of Experimental Medicine, University of Perugia, Perugia, Italy; the Pediatric Unit, Department of Translational Medical Sciences, Regional Cystic Fibrosis Center, Federico II University Naples, Naples, Italy; the Department of Biology, University of Rome “Tor Vergata”, Rome, Italy; Department of Chemical, Materials and Production Engineering, Federico II University Naples, Naples, Italy; the Department of Food Safety, Nutrition and Veterinary Public Health, Istituto Superiore di Sanità, Roma, Italy; University San Raffaele and 21 IRCCS San Raffaele, Rome, Italy; Department of Pharmacology and Toxicology, Faculty of Medicine, University of Munich (LMU), Munich, Germany; the Institute of Physiology CH, University of Zurich, Zurich, Switzerland; the National Institute for Infectious Diseases IRCCS “L. Spallanzani”, Rome, Italy; the Centre de Recherche des Cordeliers, Equipe11 labellisée Ligue Nationale Contrele Cancer, Paris, France; the Centre de Recherche des Cordeliers, INSERM U1138, Paris, France; the Université Paris Descartes, Paris, France; the Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France; the Pôle de Biologie, Hôpital Européen Georges Pompidou, AP-HP, Paris, France; and the Department of Women’s and Children’s Health, Karolinska Institute, Karolinska University Hospital, Stockholm, Sweden.
  6. Celiac.com 03/14/2019 - Researchers still don’t know much about the mechanisms driving inflammatory responses against certain antigens in food. To get more information, a team of researchers recently set out to see if p31-43 peptide (p31-43) from α-gliadin can trigger an innate immune response in the gut, and whether this might trigger pathological adaptive immunity. The research team included María Florencia Gómez Castro, Emanuel Miculán, María Georgina Herrera, Carolina Ruera, Federico Perez, Eduardo Daniel Prieto, Exequiel Barrera, Sergio Pantano, Paula Carasi, and Fernando Gabriel Chirdo. They are variously affiliated with the Instituto de Estudios Inmunológicos y Fisiopatológicos (CONICET), Universidad Nacional de La Plata, La Plata, Argentina, the Instituto de Fisicoquímica y Químicas Biológicas, Dr. Alejandro Paladini (CONICET), Universidad de Buenos Aires, Buenos Aires, Argentina, the Laboratorio de Nanoscopía y Fisicoquímica de Superficies (CONICET), Universidad Nacional de La Plata, La Plata, Argentina, and the Biomolecular Simulations Group, Institut Pasteur de Montevideo, Montevideo, Uruguay. Researchers do not currently understand the receptors and mechanisms responsible for the induction of innate immunity by p31-43. In their recent paper on the subject, the research team offers evidence that conformational changes in the peptide may allow it to activate the NLRP3 inflammasome. When researchers treated normal mice with p31-43, but not with scrambled or inverted peptides, the mice developed enteropathy in the proximal small intestine, which is associated with higher levels of type I interferon and mature IL-1β. P31-43 demonstrated a sequence-specific spontaneous ability to form structured oligomers and aggregates in vitro and to activate the ASC speck complex. The enteropathy caused by p31-43 in live mice occurred only in the presence of NLRP3 or caspase 1, and was restricted by treatment with caspase 1 inhibitor Ac-YVAD-cmk. Together, the data show that p31-43 gliadin naturally forms oligomers, which trigger the NLRP3 inflammasome. Moreover, this pathway is necessary for intestinal inflammation and pathology when p31-43 is given orally to mice. This innate activation of the NLRP3 inflammasome could play a key role in the early stages of celiac disease development. Read more at Front Immunol. 2019

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  8. Celiac.com 02/26/2019 - Researchers don't have much good information on gastrointestinal (GI) hormone response as it relates to appetite and glucose metabolism in celiac patients. To get some answers, a team of researchers recently set out to assess appetite sensation, glycaemia and hormone response induced by a complex meal in patients with celiac disease. The research team included Paola Vitaglione, Fabiana Zingone, Nicolina Virgilio, and Carolina Ciacci. They are variously affiliated with the Department of Agricultural Sciences, University of Naples “Federico II," in Portici, Italy; the Department of Surgery, Oncology, and Gastroenterology, University of Padua, in Padua, Italy; and the Department of Medicine, Surgery, and Dentistry, “Scuola Medica Salernitana” University of Salerno, in Fisciano, Italy. For their single day intervention study, the team enrolled twenty-two women with celiac disease, nine at celiac diagnosis (CeDD), thirteen celiacs following a gluten-free diet (CeDGF), and ten healthy subjects. For the study, each subject ate a gluten-free test meal, recorded their appetite sensations, and gave a blood specimen more than three hours after eating. The after meal data showed less hunger reduction in celiac patients, compared to gluten-free celiacs and healthy subjects. Reported fullness and satiety was about the same for all three groups. The diagnosed celiac group showed lower insulin and glucose-dependent insulinotropic polypeptide (GIP) than the gluten-free celiac group the healthy control subjects. Both the diagnosed celiac group and the gluten-free celiac group showed a lower glucose response post-eating than healthy subjects. The results of this study suggest that people with celiac disease have glucose absorption problems, even after more than a year on a gluten-free diet. Increases in postprandial glucose-dependent insulinotropic polypeptide (GIP) may play a significant role in appetite cues and insulin response to a complex gluten-free meal. The takeaway here is that whether they are eating gluten-free or not, people with celiac disease show a lower glucose response after meals than healthy subjects. Moreover, celiacs who are not gluten-free show less hunger reduction after gluten-free meals than gluten-free celiacs and healthy subjects. Celiac disease definitely influences appetite and gastrointestinal hormone response to a gluten-free meal, but more and larger studies are needed to better understand the implications of these findings. Read more at: Nutrients, 2019 Jan; 11(1): 82. doi: 10.3390/nu11010082
  9. Celiac.com 10/29/2018 - Researchers Emma L. Smith with UCB Pharma Ltd., Slough, United Kingdom, and Mark Peakman from the Department of Immunobiology, King’s College London, London, United Kingdom recently set out to catalog clinical advances in peptide immunotherapy for Type 1 diabetes. Autoimmune and allergic diseases occur when a person’s body has an incorrect immune response to an antigen from the person’s own body, or to an innocuous antigen from outside the body. This triggers a pathogenic T-cell response which causes damage to certain tissues and organs. In Type 1 diabetes, this process results in the destruction of the insulin-secreting β cells, which leads to permanent need for recombinant insulin to make up for the loss. The best way to restore immune homeostasis and prevent further tissue damage is to reduce or cease the pathogenic T-cell response by using antigen-specific peptide immunotherapy. Smith and Peakman found that recent clinical advances with peptide therapy approaches in both Type 1 diabetes and other diseases are beginning to show encouraging results. New treatments that target peptides specific to certain cell types are also moving from the development stages into clinical use. Drug developers still face numerous hurdles in reaching full clinical use, including determining optimal dose and dosing frequency, but peptide immunotherapy for Type 1 diabetes is clearly becoming a very active field of drug development. Read their full report: Front Immunol. 2018; 9: 392.Published online 2018 Feb 28. doi: &nbsp;10.3389/fimmu.2018.00392PMCID: PMC5836708PMID: 29541078
  10. Celiac.com 08/20/2015 - Celiac disease is frequently mis-diagnosed. Even when patients received endoscopy, celiac disease is often missed or not detected. A team of researchers recently assessed the accuracy of finger prick-based point-of-care tests in the detection of celiac disease, and developed an algorithm for diagnosis. The research team included PD Mooney, SH Wong, AJ Johnston, M Kurien, A Avgerinos, and DS Sanders. They are variously affiliated with the Royal Hallamshire Hospital, Sheffield, United Kingdom and the University of Sheffield, Sheffield, United Kingdom. Their team conducted a prospective study of two groups of celiac disease patients evaluated at the Royal Hallamshire Hospital in Sheffield UK from March 2013 through February 2014. In group one, the team evaluated 55 patients at high risk for celiac disease, and who tested positive for endomysial antibody, using the Biocard test (BHR Pharmaceuticals, Nuneaton, UK) and the Celiac Quick Test (Biohit Healthcare UK, Ellesmere Port, UK), which measure antibodies to tissue transglutaminase (anti-tTG), and the Simtomax test (Tillotts Pharma, Rheinfelden, Switzerland), which measures deamidated gliadin peptide antibodies (DGP). Group 2 included 508 consecutive patients who received an endoscopy for any reason, received the DGP test, and also were evaluated using a diagnostic algorithm that incorporated results from the DGP test and data on symptoms. For both groups, point-of-care tests were administered at the time of endoscopy, and the results compared against results from histologic analyses of duodenal biopsy specimens from all patients. In group 1, the DGP test identified patients with celiac disease with 94.4% sensitivity, the Celiac Quick Test identified patients with 77.8% sensitivity (P = .03 vs the DGP test), while the Biocard test identified patients with 72.2% sensitivity (P = .008 vs the DGP test). In group 2, the DGP test identified patients with celiac disease with 92.7% sensitivity (95% confidence interval, 83.0-97.3), 85.2% specificity (95% confidence interval, 81.5-88.3), a positive predictive value of 49.2% (95% confidence interval, 40.3-58.2), and a negative predictive value of 98.7% (95% confidence interval, 96.8-99.5). Measurement of serum anti-tTG identified patients with celiac disease with 91.2% sensitivity (95% confidence interval, 81.1-96.4), 87.5% specificity (95% confidence interval, 84.0-90.4), a positive predictive value of 53.0% (95% confidence interval, 43.6-62.2), and a negative predictive value of 98.5% (95% confidence interval, 96.5-99.4). The algorithm identified patients with celiac disease with 98.5% sensitivity, and has the potential to reduce duodenal biopsies by 35%. In this prospective study, the test for DGP identified celiac patients with comparable sensitivity and specificity as standard serologic analysis of anti-tTG. Conducting the DGP test before endoscopy might increase the accuracy of the diagnosis of celiac disease. These results look promising, but further study is needed, in lower-prevalence populations, to more accurately determine the potential benefits of the DGP test in celiac screening. Source: Clin Gastroenterol Hepatol. 2015 Jul;13(7):1278-1284.e1. doi: 10.1016/j.cgh.2015.01.010. Epub 2015 Jan 26.
  11. Celiac.com 01/29/2015 - Testing for tissue transglutaminase antibodies (TGA) is currently a common part of attempting to diagnose celiac disease. A research team wanted to find out if determination of antibodies to synthetic deamidatedgliadin peptides (anti-DGP) might work as an alternative or complement to TGA testing. To find out, the team assessed the performance of a time-resolved immunofluorometry (TR-IFMA) based anti-DGP assay in the diagnosis of celiac disease in children, and also retrospectively analyzed the appearance of anti-DGP antibodies before TGA seroconversion. The research team included A. Lammi, P. Arikoski, S. Simell, T. Kinnunen, V. Simell, S. Paavanen-Huhtala, A. Hinkkanen, R. Veijola, M. Knip, J. Toppari, O. Vaarala, O. Simell, and J. Ilonen. They are variously affiliated with the Department of Clinical Microbiology and the A.I. Virtanen Institute for Molecular Sciences at the University of Eastern Finland in Kuopio, Finland, the Department of Pediatrics at Kuopio University Hospital and University of Eastern Finland, Kuopio, Finland, the Department of Pediatrics at the University of Oulu and Oulu University Hospital in Oulu, Finland, the Children's Hospital, and the Institute of Clinical Medicine at the University of Helsinki in Helsinki, Finland, the Folkhälsan Research Center in Helsinki, Finland, the Department of Pediatrics at Tampere University Hospital in Tampere, Finland, the Immunogenetics Laboratory, and the Department of Physiology at the University of Turku, and with the Department of Pediatrics and Adolescent Medicine at the University of Turku and Turku University Hospital in Turku, Finland. For their study, the team assessed 92 children with biopsy-confirmed celiac disease. The team took blood samples at the time of, or just prior to, clinical diagnosis. The team also assessed a control group of 82 TGA-negative children who were positive for HLA-DQ2 or -DQ8. Based on receiver operating characteristics (ROC) curves, they found that the optimal cut-off value for IgA anti-DGP positivity was 153 arbitrary units (AU) with a sensitivity of 92.4% and specificity of 97.6%, while the optimal cut-off value for IgG anti-DGP 119 AU, with a sensitivity of 97.8% and specificity of 97.6%. They found that all 92 children with celiac disease tested positive for either IgA or IgG anti-DGP at the time of diagnosis. Blood results from 48 children with celiac disease, analyzed retrospectively before the diagnosis, showed that anti-DGP antibodies preceded TGA positivity in 35 of 48 celiac disease children and appeared an average of one year earlier. From these results, the TR-IFMA test for detecting anti-DGP antibodies shows high sensitivity and specificity for celiac disease in children. For most of the patients, anti-DGP seropositivity preceded TGA positivity, which means that monitoring anti-DGP antibodies frequently in genetically susceptible children might allow doctors to spot celiac disease earlier than allowed by current tests. Source: J Pediatr Gastroenterol Nutr. 2014 Dec 16.
  12. Celiac.com 03/09/2011 - A team of researchers recently identified a novel immunomodulatory gliadin peptide that triggers interleukin-8 release in a chemokine receptor CXCR3-dependent manner only in patients with celiac disease. The research team included Karen M. Lammers; Sunaina Khandelwal; Fatima Chaudhry; Debby Kryszak; Elaine L. Puppa; Vincenzo Casolaro; and Alessio Fasano. The same research team had previously reported that the chemokine receptor CXCR3 serves as a receptor for specific gliadin peptides that trigger zonulin release and increase in intestinal permeability. This mechanism plays an important role in the adverse immune reaction to gluten-containing grains that is central to the classic celiac disease response. To examine the role of CXCR3 in the immune response to gliadin, the researchers incubated peripheral blood mononuclear cells of both celiac patients and healthy controls with either pepsin-trypsin-digested gliadin or 11 α-gliadin synthetic peptides in the presence or absence of a blocking anti-CXCR3 monoclonal antibody. The team then analyzed supernatants for interleukin-6 (IL-6), IL-8, IL-10, IL-13, IP-10 (CXCL10), tumour necrosis factor-α and interferon-γ. Gliadin triggered cytokine production regardless of clinical condition. However, only small number of individuals showed IL-8 production. In those individuals, cells originating from white blood cells were the main source of IL-8 production. The team used one of a comprehensive panel of synthetic α-gliadin peptides to reproduce the induction of IL-8. They were able to cease the process by blocking CXCR3 before stimulation with either gliadin or this peptide in the celiac group, but not in the control group. This suggests that gliadin-induced IL-8 production is CXCR3-dependent only in people with celiac disease. Source: Immunology, Volume 132, Number 3, March 2011 , pp. 432-440(9)
  13. Celiac.com 03/25/2010 - A team of researchers recently set out to compare the diagnostic performance of IgG anti-deamidated gliadin peptide antibody assays against IgA anti-tTG in celiac disease. The team included P. Vermeersch, K. Geboes, G. Mariën, I. Hoffman, M. Hiele, X. Bossuyt, all associated with the department of Laboratory Medicine, Immunology of University Hospitals at the Catholic University of Leuven, Belgium. Using IgG anti-deamidated gliadin peptide antibody assays to test for celiac disease is more sensitive and more specific for celiac disease than detection of IgG antibodies against native gliadin. The team compared assessed the technical performance and accuracy (sensitivity and specificity) of commercial IgG anti-DGP assays from Euroimmun, Inova, Phadia and The Binding Site against other serologic assays for celiac disease, such as 3IgA and 2IgG anti-tTG assays, 1IgA and 1IgG anti-gliadin assay, 1IgA anti-DGP assay. For the study, they tested 86 patients with clinically proven celiac disease and 741 healthy control subjects. Technical performance of IgG anti-DGP assays as gauged by linearity, interference and imprecision, was within acceptable levels. IgG anti-DGP assay sensitivity ranged between 76.7% and 83.7% at the manufacturer's recommended cut-off, and between 74.4% and 84.9% at a cut-off that corresponded to a 98% specificity level. Specificity ranged between 97.3% and 99.3%. The diagnostic accuracy of the IgG anti-DGP assays was comparable to the diagnostic accuracy of the IgA anti-tTG assays. IgG anti-DGP assays showed significantly better than sensitivity than the IgG anti-tTG assays (p<0.05) and and significantly better specificity than IgA and IgG anti-gliadin assays (p<0.05). The four IgG anti-DGP assays all performed within acceptable limits, and diagnosed celiac disease with comparable accuracy as did the three IgA anti-tTG assays. Source: Clin Chim Acta. 2010 Feb 19.
  14. A team of researchers recently to examine the design of new high affinity peptide ligands for HLA-DQ2 using a positional scanning peptide library. The research team included U. Jüse, Y. van de Wal, F. Koning, L. M. Sollid, B. Fleckenstein with the Centre for Immune Regulation, Institute of Immunology, Oslo University Hospital-Rikshospitalet, Oslo, Norway. HLA-DQ2 (DQA1*0501/DQB1*0201) is associated with several immune disorders including celiac disease, which results from an inappropriate T-cell response to gluten. Researchers hope that interference with peptide presentation by HLA-DQ2, perhaps through the use of of peptide blockers, might lead to new treatment strategy for such HLA associated disorders. For such strategies to work, it will be necessary to identify ligands that bind much better to HLA-DQ2 than the disease related epitopes. The team used a positional scanning nonapeptide library to determine the optimal amino acids for each position of the HLA-DQ2 binding frame. By combining the optimal residues in each position, the team was able to design high affinity binders to HLA-DQ2. Interestingly, the decapeptide with highest affinity was composed of the most favorable residues in each position. This sequence bound 50-fold better than the immunodominant gluten epitope DQ2-alpha-I-gliadin what makes it an interesting lead compound for the development of blockers. The correlation between measured and predicted affinities was poorer for some natural HLA-DQ2 ligands, but notably these peptides did not have optimal amino acids at all positions. The team's method offers a straightforward approach for developing high affinity binders to HLA class II molecules. Source: Hum Immunol. 2010 Jan 24.
  15. Celiac.com 09/30/2009 - Are non-inflammatory gluten peptide analogs effective as biomarkers for celiac disease? Recent research indicates that they just might represent an effective new tool in the management of celiac disease. In the August 28th issue of Chemical Biology, a team of researchers from Stanford University's Department of Biochemistry issues a call for new tools to manage celiac disease, a lifelong immune disease of the small intestine. Non-inflammatory gluten peptide analogs may be one of the important new tools in that effort. The research team is made up of M. T. Bethune, M. Crespo-Bosque, E. Bergseng, K. Mazumdar, L. Doyle, K. Sestak, L. M. Sollid, and C. Khosla. They note that current drug trials are sparking a researchers to seek non-invasive biomarkers of gluten-induced intestinal change. They note also that they have synthesized and characterized non-inflammatory gluten peptide analogs in which Asn or His replace key Gln residues. As with their pro-inflammatory associates, these genetic markers resist gastrointestinal proteases, are susceptible to glutenases, and permeable across enterocyte barriers. In contrast with gluten peptides, however, the markers are not commonly acknowledged by transglutaminase, HLA-DQ2, or disease-specific T cells. In vitro and animal tests prove that the biomarkers can reveal shifts in intestinal permeability as well as glutenase-catalyzed gastric detoxification of gluten. As a result, they call for controlled clinical studies to assess the use of these peptides as markers for abnormal intestinal permeability in celiac patients and for the effectiveness of glutenase in clinical trial and treatment of celiac disease. Chem Biol. 2009 Aug 28;16(8):868-81.
  16. Celiac.com 04/24/2009 - Currently, one of the more promising areas of celiac disease research looks to be in peptide-based therapies. One of the keys to creating an effective peptide-based therapy for celiac disease lies in identifying the gluten peptides that trigger intestinal T cell responses when people with celiac disease consume wheat, rye, or barley. A team of Italian researchers recently set out to do just that. The team was made up of A. Camarca, R.P. Anderson, G. Mamone, O. Fierro , A. Facchiano, S. Costantini, D. Zanzi, J. Sidney, S. Auricchio, A. Sette, R. Troncone, and C. Gianfrani. Their efforts were supported by the Institute of Food Sciences-National Research Council, Avellino, Italy. Their research carries strong implications for a peptide-based therapy in celiac disease. Presently, several gluten peptides are known to be active in celiac disease. The identification of additional gluten peptides eliciting intestinal T cell responses is critical for designing a successful peptide-based immunotherapy for celiac disease. In their study, the research team assessed the recognition profile of gluten immunogenic peptides in adult HLA-DQ2(+) celiac patients. They did so by creating several lines of polyclonal, gliadin-reactive T cells from jejunal mucosa. They then tested for both proliferation and IFN-gamma production in reaction to 21 peptides from wheat glutenins and alpha-, gamma-, and omega-gliadins. They then conducted a magnitude analysis of the IFN-gamma responses to determine the spectrum of individual peptide activity, and to rank them accordingly. Notably, 12 of the 14 patients responded to a different array of peptides. All alpha-gliadin stimulatory peptides mapped the 57-89 N-terminal region, thus affirming the importance of the known polyepitope 33-mer, although only 50% of subjects recognized 33-mer. By contrast, 11 of 14 celiac subjects, nearly 80%, responded to gamma-gliadin peptides. A 17-mer variant of 33-mer, QLQPFPQPQLPYPQPQP, posessing only a single copy of DQ2-alpha-I and DQ2-alpha-II epitopes, displayed the same potency as 33-mer in triggering intestinal T cell responses. One particular peptide from omega-gliadin, QPQQPFPQPQQPFPWQP, though structurally related to the alpha-gliadin 17-mer, is a separate epitope and activated in 5 out of 14 subjects. The team's data reveal that intestinal T cells respond to a wide array of peptides, and that this heterogeneity emphasizes the relevance of gamma- and omega-gliadin peptides in celiac disease pathogenesis. Their findings indicate that, in DQ2(+) celiac patients, the most active gluten peptides are alpha-gliadin (57-73), gamma-gliadin (139-153), and omega-gliadin (102-118). J Immunol. 2009 Apr 1;182(7):4158-66.
  17. July 2000 - Chemistry In Britain Summarized by Linda Blanchard Celiac.com 01/10/2001 - The article states that Oxford physicians and scientists did an experiment in which celiac patients who were previously on a gluten-free diet were fed a series of human-made peptides that are copies of portions of the peptide chains that are found in the gliadin portion of wheat. The hope was that by feeding those in the study overlapping partial chains, and then testing their blood for T-cells afterward, they could find which specific portion of the wheat protein set off the immune reaction in celiacs. One single peptide did trigger the reaction. Now that it has been identified, it is hoped that some solutions to the problems caused by celiac disease may become available. Two approaches seem to involve "turning off" the reaction -- its thought that offering a megadose of the particular peptide might turn the immune reaction off. Another method would involve offering a peptide that was very similar to the offending piece of wheat protein -- but just enough different that it might "turn off" the reaction. Another possibility is, of course, genetically modified wheat. It should be possible for scientists to develop a wheat that has a different peptide in the place of the offender, which would hopefully look, taste, and act as wheat does in normal baking without triggering celiac reactions.
  18. Nat Med 2000;6:337-342. (March 1, 2000) see also: BMJ 2000;320:736 (March 18, 2000) (Celiac.com 03/17/2000) Researchers in Britain have identified a dominant epitope of the A-gliadin protein of wheat that is linked to the cause of celiac disease. The findings could eventually influence the diagnosis and treatment of the disease. With the new information Wheat could be genetically engineered to be non-toxic for celiacs, according to Dr. Robert P. Anderson. Also, modified versions of T cell epitopes can have unique antagonistic effects that switch off particular immune responses. The identification of this peptide could be used to develop a blood tests to better diagnose celiac disease, and could also be used to better test food for celiac toxicity. Dr. Anderson and his University of Oxford colleagues used a series of 15 amino acid peptides along the A-gliadin sequence (alpha gluten) to stimulate in patients with celiac disease their peripheral blood mononuclear cells, or PBMCs. The peptides were either unmodified or were treated with tissue transglutaminase, which, in the presence or absence of lysine, will convert glutamine to glutamate. Researchers successfully stimulated PBMCs in celiac patients who were in remission due to a gluten-free diet with a gluten challenge. Patients were fed wheat bread for either a half day, 3 days, or 10 days, and healthy, non-celiac patients that were fed wheat bread each day for 4 weeks were used as controls. The researchers successfully produced PBMCs from the celiac disease group, who secreted interferon-gamma 6-8 days later, in response to a particular pool of A-gliadin peptides, which had been treated with tissue transglutaminase. A 17-amino-acid peptide, corresponding to the partially deamidated peptide of A-gliadin amino acids 57-73, was optimal for inducing the interferon-gamma secretion, and the responses were restricted to those with HLA-DQ2. According to Dr. Anderson: On a more general level, the finding that a host enzyme modifies peptides that are then recognized by the immune system suggests that searching for epitopes important in disease may be more complex than simply reading off protein sequences from sequenced genes. Further, modification of the peptide by tissue transglutaminase that is present in the intestinal lining increases binding of the peptide to HLA-DQ. The researchers also point out that T cells that are responsive to the same A-gliadin peptide are readily induced in celiac disease despite many years of following a gluten-free diet, which indicates a persistence of memory T cells that could be caused by continuing exposure to trace amounts of gluten. The researchers only looked at the A-gliadin peptide, and point out that there is a possibility that other peptides that are structurally unrelated to A-gliadin are also important in celiac disease.
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