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• W2061528086 abstract "Transient receptor potential melastatin 7 (TRPM7) is a Ca2+- and Mg2+-permeable nonselective cation channel that contains a unique carboxyl-terminal serine/threonine protein kinase domain. It has been reported that reactive oxygen species associated with hypoxia or ischemia activate TRPM7 current and then induce Ca2+ overload resulting in neuronal cell death in the brain. In this study, we aimed to investigate the molecular mechanisms of TRPM7 regulation by hydrogen peroxide (H2O2) using murine TRPM7 expressed in HEK293 cells. Using the whole-cell patch-clamp technique, it was revealed that the TRPM7 current was inhibited, not activated, by the application of H2O2 to the extracellular solution. This inhibition was not reversed after washout or treatment with dithiothreitol, suggesting irreversible oxidation of TRPM7 or its regulatory factors by H2O2 under whole-cell recording. Application of an electrophile, N-methylmaleimide (NMM), which covalently modifies cysteine residues in proteins, also inhibited TRPM7 current irreversibly. The effects of H2O2 and NMM were dependent on free [Mg2+]i; the inhibition was stronger when cells were perfused with higher free [Mg2+]i solutions via pipette. In addition, TRPM7 current was not inhibited by H2O2 when millimolar ATP was included in the intracellular solution, even in the presence of substantial free [Mg2+]i, which is sufficient for TRPM7 inhibition by H2O2 in the absence of ATP. Moreover, a kinase-deficient mutant of TRPM7 (K1645R) was similarly inhibited by H2O2 just like the wild-type TRPM7 in a [Mg2+]i- and [ATP]i-dependent manner, indicating no involvement of the kinase activity of TRPM7. Thus, these data suggest that oxidative stress inhibits TRPM7 current under pathological conditions that accompany intracellular ATP depletion and free [Mg2+]i elevation." @default.
• W2061528086 created "2016-06-24" @default.
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• W2061528086 date "2014-07-01" @default.
• W2061528086 modified "2023-10-04" @default.
• W2061528086 title "Mg2+- and ATP-dependent inhibition of transient receptor potential melastatin 7 by oxidative stress" @default.
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• W2061528086 doi "https://doi.org/10.1016/j.freeradbiomed.2014.04.015" @default.
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• W2061528086 hasPublicationYear "2014" @default.
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