Celiac.com Sponsor (A1):



Celiac.com Sponsor (A1-m):


  • You've found your Celiac Tribe! Join our like-minded, private community and share your story, get encouragement and connect with others.

    💬

    • Sign In
    • Sign Up
  • Jefferson Adams

    Live Fluorescence Imaging of Exogenous Enzyme Action in the Gastrointestinal Tract

    Jefferson Adams
    0
    Reviewed and edited by a celiac disease expert.

    Photo: CC-timbrauhn
    Caption: Photo: CC-timbrauhn

    Photo: CC-timbrauhnCeliac.com 09/12/2011 - Exogenous enzymes are enzymes that are created outside of the body. Doctors use exogenous enzymes, usually orally, to treat several diseases, such as pancreatic insufficiency and lactose intolerance.

    Because these enzymes are protein-based, they can be inactivated and/or digested in the gastrointestinal (GI) tract.



    Celiac.com Sponsor (A12):






    Celiac.com Sponsor (A12-m):




    A research team recently established a convenient fluorescence-based test to measure the activity of therapeutic enzymes live and in real time in the GI tract.

    The research team included Gregor Fuhrmann and Jean-Christophe Leroux. They are affiliated with the Department of Chemistry and Applied Biosciences, Institute of Pharmaceutical Sciences in Zurich, Switzerland.

    To establish proof of their principle, the team applied their assay to proline-specific endopeptidases (PEPs), a group of enzymes recently proposed as adjuvant therapy for celiac disease, which is a very common immunogenetic enteropathy.

    To do so, they took a short PEP-specific peptide sequence from larger immunotoxic sequences of gluten. They then labeled each sequence with a fluorescent dye and a corresponding quencher.

    Once the enzyme sequence split, they dequenched the fluorescence emission and then used an live imaging system to detect the result.

    The team then evaluated PEPs originating from Flavobacterium meningosepticum (FM) and Myxococcus xanthus (MX) after oral administration in rats.

    While MX PEP could not split the peptide in the stomach, FM PEP showed significant gastric activity reaching 40–60% of the maximal live signal intensity. However, both enzymes produced similar fluorescence signals in the small intestine.

    Using an antacid significantly enhanced MX PEP’s gastric activity due to increased pH and/or inhibition of stomach proteases. By using this simple method, the team was able to observe differences in the live performance of PEPs, which could not be identified under laboratory conditions.

    This imaging method could be used for live study other oral enzymes and may prove useful in improving current treatments.


    Source:


    0

    User Feedback

    Recommended Comments

    There are no comments to display.



    Join the conversation

    You are posting as a guest. If you have an account, sign in now to post with your account.
    Note: Your post will require moderator approval before it will be visible.

    Guest
    Add a comment...

    ×   Pasted as rich text.   Restore formatting

      Only 75 emoji are allowed.

    ×   Your link has been automatically embedded.   Display as a link instead

    ×   Your previous content has been restored.   Clear editor

    ×   You cannot paste images directly. Upload or insert images from URL.


  • About Me

    Jefferson Adams is Celiac.com's senior writer and Digital Content Director. He earned his B.A. and M.F.A. at Arizona State University, and has authored more than 2,500 articles on celiac disease. His coursework includes studies in science, scientific methodology, biology, anatomy, medicine, logic, and advanced research. He previously served as SF Health News Examiner for Examiner.com, and devised health and medical content for Sharecare.com. Jefferson has spoken about celiac disease to the media, including an appearance on the KQED radio show Forum, and is the editor of the book "Cereal Killers" by Scott Adams and Ron Hoggan, Ed.D.


  • Celiac.com Sponsor (A17):
    Celiac.com Sponsor (A17):





    Celiac.com Sponsors (A17-m):




  • Related Articles

    Scott Adams
    Journal of Clinical Gastroenterology 2003; 36(3):219-221
    Celiac.com 03/28/2003 - A study by Antonio Tursi, M.D, et al, was recently conducted to evaluate the correlation between the degree of histologic intestinal damage in celiac patients and their level of positivity (serum value) to anti-tissue transglutaminase antibodies (anti-tTG). The study looked at 119 adult celiac patients who were diagnosed consecutively (47 men and 72 women; mean age, 28 years; range, 22-51 years), and were stratified for histologic damage according to Marsh classification. The final step was to compare their Marsh histologic intestinal damage classification with...

    Jefferson Adams
    Celiac.com 03/22/2010 - The main cause for gluten intolerance continues to puzzle scientists, but pathogenesis theories include both genetic susceptibility and environmental triggers, like a virus or infection.
    For the first time, scientists working with the Academy of Finland’s Research Program on Nutrition, Food, and Health have found genes in the body that are associated both with the immune system and with the body's ability to properly digest gluten in the intestinal tract.
    Gluten intolerance arises from an autoimmune reaction in the small intestine to the gluten protein found in wheat, barley and rye. Academy Research Fellow Paivi Saavalainen, ...

    Tina Turbin
    Celiac.com 06/28/2010 - Studies on the genetic links to celiac disease are leading to more research which may lead to new and more effective ways to treat the disease, an exciting  prospect for celiacs who may want to enjoy some gluten now and then.  Celiac disease is an autoimmune disease, the source of this being gluten, a protein found in wheat, rye, and barley, affecting about 1% of the population and 300 million Americans. The disease attacks the villi,the finger-like structure which line the small intestine, leading to stomach troubles and malabsorption of nutrients. Left untreated, it can cause severe health conditions and complications such as a...

    Jefferson Adams
    Celiac.com 06/03/2015 - Although dietary gluten is the trigger for celiac disease, risk is strongly influenced by genetic variation in the major histocompatibility complex (MHC) region.
    A team of researchers recently set out to fine map the MHC association signal to identify additional celiac disease risk factors independent of the HLA-DQA1 and HLA-DQB1 alleles. The researchers included J. Gutierrez-Achury, A. Zhernakova, S.L. Pulit, G. Trynka, K.A. Hunt, J. Romanos, S. Raychaudhuri, D.A. van Heel, C. Wijmenga, and P.I. de Bakker.
    Their team fine mapped the MHC association signal looking for risk factors other than the HLA-DQA1 and HLA-DQB1 alleles...