Immunology 87(3): 396-401
Oxidative stress triggers tyrosine phosphorylation in B cells through a redox- and inflammatory cytokine-sensitive mechanism.
Abstract
Exposure to oxidants such as hydrogen peroxide (H2O2) and gamma-ray irradiation has been recently shown to trigger tyrosine phosphorylation in B cells as does cross-linking surface immunoglobulin (sIg) by antigens or anti-immunoglobulins. We studied the mechanism by which H2O2 induced tyrosine phosphorylation in B cells and compared it with the mechanism utilized by sIg. Both anti-immunoglobulin M (anti-IgM) and H2O2 induced tyrosine phosphorylation through protein tyrosine kinase (PTK) activation. However, the tyrosine phosphorylation caused by H2O2 but not that induced by anti-IgM, was modulated by agents affecting cellular thiols and glutathione contents including dithiothreitol, 2-mercaptoethanol, and buthionine sulphoximine. Moreover, the tyrosine phosphorylation caused by the oxidant but not that induced by anti-IgM was markedly augmented by two inflammatory cytokines, tumour necrosis factor-alpha and interleukin-1 alpha, although these agents by themselves did not stimulate PTK activity nor induce tyrosine phosphorylation. These findings demonstrate that oxidative stress but not surface IgM (sIgM) ligation triggers tyrosine phosphorylation through a mechanism that is sensitive to cellular thiols and these inflammatory cytokines.
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