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We investigated the influence of dendritic cell (DC) CD40 expression on Th2 and Th1 development by in vivo transfer of Ag-pulsed bone marrow-derived DC generated from wild-type (WT) or CD40(-/-) mice. Contrary to expectation, CD40(-/-) DC primed with Ag that inherently induce a Th2 response (soluble egg Ag from Schistosoma mansoni) failed to induce a Th2 response or any compensatory Th1 response, whereas CD40(-/-)DC primed with Ag that inherently induce a Th1 response (Propionibacterium acnes) generated a competent Th1 response. Thus, DC expression of CD40 is a prerequisite for initiation of Th2, but not Th1, responses by these Ag. Consistent with this, CD154(-/-) mice, unlike WT mice, failed to mount a Th2 response when directly injected with schistosome eggs but mounted a normal Th1 response after challenge with P. acnes. CD40-CD154 interaction can therefore play a major role in Th2 response induction.

Cutting Edge: Th2 Response Induction by Dendritic Cells: A Role for CD40