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. 1992 Aug 15;89(16):7762–7766. doi: 10.1073/pnas.89.16.7762

Induction of immunity and oral tolerance with polymorphic class II major histocompatibility complex allopeptides in the rat.

M H Sayegh 1, S J Khoury 1, W W Hancock 1, H L Weiner 1, C B Carpenter 1
PMCID: PMC49791  PMID: 1502196

Abstract

We studied the immunogenicity and tolerogenicity of class II major histocompatibility complex (MHC) allopeptides in the rat. Inbred LEW (RT1l) rats, used as responders, were immunized in the foot pad with a mixture of eight synthetic class II MHC allopeptides emulsified in complete Freund's adjuvant. These sequences represent the full-length second domain of RT1.Bu and RT1.Du (WF) beta chains. In vitro, responder lymphocytes harvested from popliteal and inguinal lymph nodes of immunized animals exhibited significant proliferation to the MHC allopeptide mixture. In addition, these responder lymphocytes had significantly increased proliferation to allogeneic WF (RT1u) stimulator cells, when compared to naive controls in the standard one-way mixed lymphocyte response. In vivo, peptide-immunized LEW animals were challenged in the ear 2 weeks after immunization with the allopeptide mixture, the individual allopeptide sequences, or allogeneic WF splenocytes. When compared to controls, these animals had significant delayed-type hypersensitivity responses to the allopeptide mixture, to the beta-pleated sheet allopeptide sequences, and to allogeneic WF splenocytes but not to the alpha-helix allopeptide sequences, to syngeneic LEW splenocytes, or to third party allogeneic BN splenocytes. Oral administration of the allopeptide mixture to LEW responder rats daily for 5 days before immunization effected significant reduction of delayed-type hypersensitivity responses both to the allopeptide mixture and to allogeneic splenocytes. This reduction was antigen-specific, since there was no reduction of delayed-type hypersensitivity responses to mycobacterium tuberculosis. These data demonstrate that lymphocytes from animals immunized with polymorphic class II MHC allopeptides can recognize and proliferate to the same amino acid sequences on allogeneic cell surface MHC molecules. In addition, oral administration of these peptides down-regulates the systemic cell-mediated immune response in a specific fashion. Synthetic MHC allopeptides should allow the study of alloimmunity in vivo, including induction of immune tolerance.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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