Oral tolerance is the phenomenon of systemic, antigen specific, immunological hyporesponsiveness that results from oral administration of a protein. The mechanism by which tolerance is generated depends on the amount of antigen administered; low doses favor induction of regulatory T cells while high
Oral tolerance: immune mechanisms and treatment of autoimmune diseases
β Scribed by Howard L. Weiner
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 909 KB
- Volume
- 18
- Category
- Article
- ISSN
- 0167-5699
No coin nor oath required. For personal study only.
β¦ Synopsis
ral tolerance describes the observation that a state of hyporesponsiveness follows immunization with a previously fed protein. It was first described in 1911 when Wells fed hen egg proteins to guinea-pigs and found them resistant to anaphylaxis when challengedL In 1946, Chase fed guinea-pigs the contact-sensitizing agent dinitrochlorobenzene (DNCB) and observed that animals had decreased skin reactivity to DNCB (Ref. 2). Furthermore, numerous investigators showed that animals fed proteins such as ovalbumin (OVA) or sheep red blood cells do not respond as well to these antigens when subsequently immunized, but do respond normally to other antigens 3. The phenomenon P11S0, 67-5699( 97) 01053-0 J U L Y I 9 9 7 REVIEW IMMUNOLOGY TODAY ' !Oral administration of antigen GALT / ",.. Low dose High dose Induction of Th2 (IL-4/IL-10)-Deletion or anergy of and Th3 (TGF-~)-secreting Thl and Th2 cells regulatory ceils Active suppression Clonal deletion/anergy \ ./
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