title: In vivo effects of ovalbumin-conjugated muramyl peptides on the anti-ovalbumin IgE and IgG responses in mice.
abstract: The effects of pretreatments of BALB/c mice with several conjugates of MDP and MDP-Lys to ovalbumin before immunization with ovalbumin (OA) were tested on the anti-OA IgE responses. Pretreatment with MDP-Lys-OA, but not with MDP-OA, induced an inhibition of the anti-OA primary and secondary responses, as measured by passive cutaneous anaphylaxis (PCA) and also by mast cell degranulation. The inhibition by pretreatment with MDP-Lys-OA was obtained whether it was administered in Freund's incomplete adjuvant (FIA) or in saline. This IgE suppression was accompanied by an enhancement of IgG2a and IgG2b anti-OA antibodies, with no change in the specific IgG1 levels. Loss of antigenicity of OA, detected by the lack of degranulation of peritoneal mast cells sensitized by IgE anti-OA, was observed in the MDP-Lys-OA but not in the MDP-OA conjugates. This loss of antigenicity appears to correlate with the ability of the conjugate to induce suppression of the specific IgE response.
mesh_terms: D000119:Acetylmuramyl-Alanyl-Isoglutamine / Q000031:analogs & derivatives / Q000276:immunology*; D000818:Animals; D000906:Antibodies / Q000032:analysis; D000917:Antibody Formation / Q000187:drug effects; D003594:Cytoplasmic Granules / Q000187:drug effects; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D007114:Immunization; D007073:Immunoglobulin E / Q000096:biosynthesis*; D007074:Immunoglobulin G / Q000096:biosynthesis*; D008297:Male; D008407:Mast Cells / Q000648:ultrastructure; D051379:Mice; D008807:Mice, Inbred BALB C; D008811:Mice, Inbred DBA; D010047:Ovalbumin / Q000276:immunology*; D013997:Time Factors
chemical_list: D000906:Antibodies; D007074:Immunoglobulin G; D007073:Immunoglobulin E; D000119:Acetylmuramyl-Alanyl-Isoglutamine; D010047:Ovalbumin