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• W4210537845 endingPage "21.2022" @default.
• W4210537845 startingPage "ENEURO.0409" @default.
• W4210537845 abstract "The antidiabetic drug metformin has been shown to reduce pain hypersensitivity in preclinical models of chronic pain and in neuropathic pain in humans. Multiple intracellular pathways have been described as metformin targets. Among them, metformin is an activator of the adenosine 5′-monophosphate protein kinase that can in turn modulate the activity of the E3 ubiquitin ligase NEDD4-2 and thus post-translational expression of voltage-gated sodium channels (Na_Vs). In this study, we found that the bulk of the effect of metformin on Na1.7 is dependent on NEDD4-2. In HEK cells, the expression of Na_V1.7 at the membrane fraction, obtained by a biotinylation approach, is only reduced by metformin when cotransfected with NEDD4-2. Similarly, in voltage-clamp recordings, metformin significantly reduced Na_V1.7 current density when cotransfected with NEDD4-2. In mouse dorsal root ganglion (DRG) neurons, without changing the biophysical properties of Na_V1.7, metformin significantly decreased Na_V1.7 current densities, but not in <i>Nedd4L</i> knock-out mice (<i>SNS-Nedd4L</i>^−/−). In addition, metformin induced a significant reduction in NEDD4-2 phosphorylation at the serine-328 residue in DRG neurons, an inhibitory phosphorylation site of NEDD4-2. In current-clamp recordings, metformin reduced the number of action potentials elicited by DRG neurons from <i>Nedd4L^fl/fl</i>, with a partial decrease also present in <i>SNS-Nedd4L</i>^−/− mice, suggesting that metformin can also change neuronal excitability in an NEDD4-2-independent manner. We suggest that NEDD4-2 is a critical player for the effect of metformin on the excitability of nociceptive neurons; this action may contribute to the relief of neuropathic pain." @default.
• W4210537845 created "2022-02-08" @default.
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• W4210537845 date "2022-02-07" @default.
• W4210537845 modified "2023-10-14" @default.
• W4210537845 title "The Antidiabetic Drug Metformin Regulates Voltage-Gated Sodium Channel Na_V1.7 via the Ubiquitin-Ligase NEDD4-2" @default.
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• W4210537845 doi "https://doi.org/10.1523/eneuro.0409-21.2022" @default.
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