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Previously, we reported that treatment of T cells with the 60-kDa heat shock protein (HSP60) inhibits chemotaxis. We now report that treatment of purified human T cells with recombinant human HSP60 or its biologically active peptide p277 up-regulates suppressor of cytokine signaling (SOCS)3 expression via TLR2 and STAT3 activation. SOCS3, in turn, inhibits the downstream effects of stromal cell-derived-1alpha (CXCL12)-CXCR4 interaction in: 1) phosphorylation of ERK1/2, Pyk2, AKT, and myosin L chain, required for cell adhesion and migration; 2) formation of rear-front T cell polarity; and 3) migration into the bone marrow of NOD/SCID mice. HSP60 also activates SOCS3 in mouse lymphocytes and inhibits their chemotaxis toward stromal cell-derived factor-1alpha and their ability to adoptively transfer delayed-type hypersensitivity. These effects of HSP60 could not be attributed to LPS or LPS-associated lipoprotein contamination. Thus, HSP60 can regulate T cell-mediated inflammation via specific signal transduction and SOCS3 activation.

the journal of immunology/the journal of immunology

Heat Shock Protein 60 Activates Cytokine-Associated Negative Regulator Suppressor of Cytokine Signaling 3 in T Cells: Effects on Signaling, Chemotaxis, and Inflammation