The Journal of Immunology, Vol 155, Issue 10 4844-4853, Copyright © 1995 by American Association of Immunologists

ARTICLES

Early IL-4 production by non-CD4+ cells at the site of antigen deposition predicts the development of a T helper 2 cell response to Schistosoma mansoni eggs

EA Sabin and EJ Pearce
Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA.

Cytokines play a major role in promoting naive Th cells to differentiate into Th1 or Th2 cells. While IL-4 is recognized as the primary pro-Th2 inducing cytokine, the identity of its cellular sources during the development of a Th2 response remains unclear. We have used Schistosoma mansoni eggs, potent stimulators of Th2 responses both during the natural progression of murine schistosomiasis and when experimentally isolated and injected into normal mice, to examine IL-4 production early in the evolution of an Ag-driven Th2 response. Analysis of peritoneal exudate cells by IL-4 specific reverse transcriptase-PCR and ELISPOT, at times following i.p. egg injection in naive C57BL/6 mice, revealed a marked, transient elevation in IL-4 production at 2 to 12 h after Ag exposure. This response was temporally accompanied by eosinophil and neutrophil infiltration and mast cell disappearance. The pattern of early IL-4 production and peritoneal cell infiltration was observed in egg-injected CD4+ cell-depleted and nude C57BL/6 mice, strongly suggesting that a non-T cell is the source of early IL-4 and that the stimulus leading to the egg-induced changes in cellular composition are T cell independent. In addition to IL-4 transcripts, peritoneal exudate cells from egg-injected T cell replete or deficient mice contained IFN-gamma and IL-12 transcripts. Control i.p. PBS injections led to no or minimal cytokine gene transcription. Early IL-4 was predictive of subsequent Th2 response development since, in contrast to C57BL/6 mice, egg-injected BALB/c mice demonstrated no detectable IL-4 production at 12 h and mounted a comparatively weak egg Ag-specific Th2 response.

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