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. 1998 Oct;106(Suppl 5):1179–1184. doi: 10.1289/ehp.98106s51179

Impact of oxidative stress on signal transduction control by phosphotyrosine phosphatases.

C M Krejsa 1, G L Schieven 1
PMCID: PMC1533353  PMID: 9788895

Abstract

Phosphotyrosine phosphatases (PTPs) serve as important regulators of cellular signal transduction pathways. PTPs are sensitive targets of oxidative stress and may be inhibited by treatments that induce intracellular oxidation. The effects of PTP inactivation under oxidizing conditions are amplified by the redox-linked activation of key protein tyrosine kinases (PTKs), thus leading to the initiation of phosphotyrosine-signaling cascades that are no longer under normal receptor control. These ligand-independent signals result in the accumulation of protein phosphotyrosine, the generation of second messengers, the activation of downstream kinases, and the nuclear translocation of nuclear factor kappa B (NF-kappa B). In this review we consider the relative contribution of oxidative stress to the effects of PTP inhibition by vanadium-based compounds in lymphocytes. Although the inactivation of PTPs can lead to NF-kappa B mobilization in the presence of antioxidants, the other effects noted appear to require a threshold of intracellular oxidation. The combined effects of oxidative stress on signal transduction cascades reflect a synergy between the initiation of signals by PTKs and the loss of control by PTPs. This suggests a mechanism by which environmental agents that cause oxidative stress may alter the course of cellular responses through induction or enhancement of signaling cascades leading to functional changes or cell death.

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