Abstract
Soluble HLA class I molecules (sHLAs) have been identified in the serum of patients with inflammatory diseases, allografts and autoimmune diseases and in serum of healthy individuals. The biological significance of these molecules, particularly after allogeneic organ transplantation, has been enigmatic. Here we show that primary alloreactive CD8 T cells interact with sHLA and undergo apoptosis in the absence of a second signal. Ligation of CD28 rescued T cells from death, implying that sHLAs induce apoptosis through selective stimulation of the T–cell receptor. CD95–L was upregulated after cytotoxic T lymphocytes were incubated with sHLAs, and cell death was blocked by a neutralizing anti–CD95–L antibody, suggesting that sHLAs induce endogenous mutual killing of activated T cells. These results provide a molecular basis for the capacity of sHLAs to downregulate T–cell responses, which may be especially relevant to organ transplantation.
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Zavazava, N., Krönke, M. Soluble HLA class I molecules induce apoptosis in alloreactive cytotoxic T lymphocytes. Nat Med 2, 1005–1010 (1996). https://doi.org/10.1038/nm0996-1005
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DOI: https://doi.org/10.1038/nm0996-1005
