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NO is a cytotoxic and immunomodulatory cytokine produced by macrophages and dendritic cells. We show that stimulation of murine and human macrophages with the heat shock proteins gp96 and hsp70 results in induction of inducible NO synthase and the production of NO. The release of NO by monocytes exposed to hsp60 has been documented previously. Immature, but not mature, dendritic cells respond in the same manner. The activity of heat shock proteins is relatively unaffected by an antagonist of LPS, and is abrogated by heat denaturation. Macrophages have been shown previously to produce NO in response to stimulation with IFN-gamma; stimulation of macrophages with mixtures of IFN-gamma and gp96 or hsp70 leads to a synergistic production of NO. The present observations extend the roles of these heat shock proteins in innate immune responses to another potent and highly conserved function of APC.

Heat Shock Proteins gp96 and hsp70 Activate the Release of Nitric Oxide by APCs