Induction of graft versus host-associated immunodeficiency by CD4+ T cell clones.

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Abstract
Previous studies have shown that the injection of parental T cells into MHC class II mismatched F1 recipient mice can lead to graft-vs-host (GvH) reaction that manifests itself by multiple symptoms. The objective of our study was to analyze GvH reactivity induced by a single T cell clone specific for host I-A or I-E alloantigen. The T cell clones tested for GvH potential were CD4+, with or without cytolytic activity in vitro and with a lymphokine pattern that classifies them as Th1 cells. The inoculation of a single T cell clone induced a severe, but transient immunodeficiency in the host that was independent of its cytolytic activity, as demonstrated by the failure to generate a CTL response to third party allogeneic cells in vitro. Induction of immunodeficiency in the recipients required preactivation of the clones in vitro by rIl-2 and the presence of the stimulator class II alloantigen in the host. Spleen cells from these mice lacked suppressor cells, they were deficient in Il-2 secretion and exhibited a decrease in the number of CD4+ T cells. In addition, I-E expression was reduced, however, without any changes in the macrophage population and an increase in surface Ig and the B cell marker B220. Simultaneous to the immunodeficiency, the clone-injected mice produced elevated antibody titers to ssDNA.

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