IL-16- and other CD4 ligand-induced migration is dependent upon protein kinase C

Cellular Immunology
N A ParadaD M Center

Abstract

Human interleukin-16, previously known as lymphocyte chemoattractant factor, is a CD4+ T cell competence growth factor initially described as a chemotactic factor for CD4+ cells. The interaction between IL-16 and its receptor CD4 leads to an increase in intracytoplasmic calcium and inositol triphosphate. Because of the association of intracellular shifts in protein kinase C (PKC) enzyme activity with production of these secondary messengers and the participation of PKC in transducing certain receptor-mediated migratory signals, we investigated the role of PKC in the CD4-mediated migratory response by IL-16. Recombinant IL-16 induces rapid translocation of PKC from the cytosol to the membrane in three separate CD4+ cell types: normal blood T cells, SUPT1 cells, and THP1 cells. PKC inhibitors H7, calphostin C, chelerythrine, and bisindolylmaleimide completely block IL-16-induced lymphocyte migration as well as the motile response induced by HIV-1 gp120 and anti-CD4 antibodies. Taken together, these data suggest a role for PKC in CD4-mediated migratory responses.

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