Zusammenfassung
Eine fehlende klinische Reaktion der Mukosa auf Nahrungsantigene überwiegt in der Mehrheit der Bevölkerung. Zusätzlich bestehen klinische und experimentelle Beweise für eine orale Toleranz beim Menschen. Der Zeitpunkt der Antigen- bzw. Nahrungszufuhr ist ein wichtiger Faktor in der Entwicklung einer Nahrungsmittelallergie. Die Induktion einer Toleranz wird oft als Th2-vermittelte Reaktion angesehen, die auf der einen Seite vor schädlichen mukosalen Immunreaktionen schützt, auf der anderen Seite jedoch zu überschießenden Abwehrreaktionen bei anfälligen Individuen beiträgt. Die primären Mechanismen der Toleranz schließen T-Zell-Zerstörung, Anergie, Suppression, "Ignoranz" und Apoptose ein. Th1-zellvermittelte verzögerte Hypersensitivitätsreaktionen, die an der Pathogenese von autoimmunen und gastrointestinalen Entzündungen beteiligt sind, sind besonders stark unterdrückt.
Die Ereignisse während der Induktion von oraler Toleranz (oder Sensibilisierung) sind zur Zeit auf molekularer Ebene noch unklar. Die Balance zwischen Toleranz (Suppression) and Sensibilisierung (Priming) ist abhängig von verschiedensten Faktoren: genetischer Hintergrund, Art und Dosis des Antigens, Häufigkeit der Aufnahme, Alter bei erster Antigenexposition, immunologischer Status (z. B. Virusinfektion), Exposition der Mutter, Antigentransmission über Muttermilch, bakterielle Besiedlung und andere Faktoren.
Abstract
Clinical non-responsiveness to food antigens is the mucosal default mechanism in the majority of the population. Good clinical and experimental evidence suggests that oral tolerance exists in humans. The timing of antigen (food) administration is an important factor in the development of food allergic sensitisation and disease. Induction of tolerance is often seen as a Th2 skewed response, which on the one hand may prevent harmful mucosal immune reactions but on the other may contribute to adverse responses in the susceptible individual. The primary mechanisms by which tolerance may be mediated include T-cell deletion, anergy, suppression, "ignorance" and apoptosis. Cell-mediated delayed hypersensitivity reactions (Th1), which are implicated as a pathogenetic principle in the development of autoimmune and gastrointestinal inflammation, are particularly well suppressed.
Regulatory events during the induction of tolerance (or sensitisation) are not well understood at the molecular level. The balance between tolerance (suppression) and sensitisation (priming) is dependent on several factors such as genetic background, nature and dose of antigen, frequency of administration, age at first antigen exposure, immunological status of the host (e.g. virus infection), dietary exposure of the mother, antigen transmission via breast milk, bacterial colonization and other factors.
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Acknowledgments
I would like to acknowledge the Deutsche Forschungsgemeinschaft (DFG), the Medical Research Council (MRC) and Nestec SA, which in part supported the work cited in this article. I also would like to thank A. Mowat and. A. Afuwape for stimulating discussions.
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Strobel, S. Understanding primary oral tolerance induction: the end of the beginning. Monatsschr Kinderheilkd 151 (Suppl 1), S10–S16 (2003). https://doi.org/10.1007/s00112-003-0801-3
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DOI: https://doi.org/10.1007/s00112-003-0801-3