The Journal of Immunology, Vol 155, Issue 1 275-284, Copyright © 1995 by American Association of Immunologists

ARTICLES

Two waves of gamma delta T cells expressing different V delta genes are recruited into schistosome-induced liver granulomas

M Sandor, AI Sperling, GA Cook, JV Weinstock, RG Lynch and JA Bluestone
Department of Pathology, College of Medicine, University of Iowa, Iowa City 52242, USA.

Isolated granulomas provide a unique model to study T cells in the site of inflammation. Schistosoma mansoni-infected mice develop liver granulomas in response to schistosome egg deposition and the granulomas contain gamma delta T cells that appear to be activated (Pgp-1high and L-selectin low). Analysis of kinetics and TCR gene usage of granuloma gamma delta T cells revealed a limited TCR repertoire restricted to V gamma 1.1, V delta 4, and V delta 6 genes, suggesting that the occurrence of gamma delta T cells in the granuloma is influenced by TCR V gene usage. The V delta 4+, but not the V delta 6+, gamma delta T cells expressed CD69, a marker of recent activation. To determine if there was a preferred order of accumulation of the gamma delta T cells in granulomas, s.c. sponge grafts were implanted into schistosome- infected mice, schistosome eggs were injected into the grafts, and accumulated T cells were sequentially analyzed. The earliest gamma delta T cell immigrants expressed V delta 6 and later immigrants expressed V delta 4 V genes. Additional evidence for a role of TCR specificity in the accumulation of gamma delta T cells in granulomas is their absence from schistosome granulomas in TCR transgenic mice that express only a single MHC-specific gamma delta TCR. Finally, gamma delta T cell recruitment into the granulomas did not require beta 2- microglobulin, since gamma delta T cells were present in liver granulomas of beta 2-microglobulin gene-disrupted mice. The analysis of the influx of gamma delta T cells into schistosome-induced, liver granulomas and schistosome egg-containing sponges provides a model system to investigate the role, if any, of gamma delta T cells in schistosome infections.

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