Oct 15, 1989

Rejection of skin allografts by CD4+ T cells is antigen-specific and requires expression of target alloantigen on Ia- epidermal cells

The Journal of Immunology : Official Journal of the American Association of Immunologists
A S RosenbergA Singer

Abstract

The effector mechanism of skin allograft rejection has been characterized as Ag specific, rejecting cells that express the target alloantigen but sparing those that do not. However, the rejection of MHC class II disparate skin grafts, in which very few cells (Langerhans cells) actually express the target Ia Ag could conceivably proceed by either one of two distinct rejection mechanisms. One possibility is that Ia- cells are destroyed by a sequence of events in which CD4+ T cells, activated by Ia+ LC, elaborate soluble factors that are either directly cytolytic or that recruit and activate non-specific effector cells. The alternative possibility is that activated CD4+ T cells elaborate soluble factors which induce Ia expression on Ia- cell populations, and that these Ia+ cells are subsequently destroyed by effector cells specific for the induced Ia alloantigens. We found that rejection of Ia+ LC was not of itself sufficient to cause rejection of skin grafts, indicating that skin allograft rejection is contingent on the destruction not only of LC but of other graft cell populations as well. We then investigated whether CD4+ T cells rejected allogeneic skin grafts in an antigen specific fashion. To do so, we engrafted immunoincomp...Continue Reading

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Mentioned in this Paper

T-Lymphocyte
H2-Bl
TC2 Cells
Allograft Rejection Pathway
Keratinocyte
Antigenic Specificity
House mice
Genes, MHC Class II
Mice, Inbred C3H
Dermal Dendritic Cells

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