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The Journal of Immunology, Vol 135, Issue 3 1698-1701, Copyright © 1985 by American Association of Immunologists

ARTICLES

Inhibition of humoral immunity in vivo by monoclonal antibody to L3T4: studies with soluble antigens in intact mice

D Wofsy, DC Mayes, J Woodcock and WE Seaman

Monoclonal antibody (MAb) to the mouse "helper" T cell antigen L3T4 inhibits the T cell response to class II major histocompatibility antigens on antigen-presenting cells in vitro and in thymectomized mice. To examine the effect of MAb to L3T4 on humoral immunity in euthymic mice, we treated BALB/c mice with 1 mg of anti-L3T4 i.p. at the time of immunization with either bovine serum albumin (BSA) or chicken egg ovalbumin (OA) in complete Freund's adjuvant. Administration of MAb to L3T4 selectively depleted greater than 90% of L3T4+ cells from the blood, spleen, and lymph nodes, but it had little effect on thymocytes. Mice treated with anti-L3T4 were unable to generate an IgG response to either BSA or OA. Treatment with anti-L3T4 also prevented the antigen-specific IgM response to these antigens, although it did not prevent nonspecific stimulation of IgM anti-BSA and anti-OA antibodies induced by adjuvant in the absence of antigen. Humoral immunity was inhibited even when treatment was delayed until 48 hr after immunization. These findings indicate that T cell help for humoral immunity can be abrogated in intact mice by MAb to L3T4.


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