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• W2060763806 abstract "Muscarinic receptors subserve many functions in both peripheral and central nervous systems. Some of these processes depend on increases in protein synthesis, which may be achieved by activation of mammalian target of rapamycin (mTOR), a kinase that regulates protein translation capacity. Here, we examined the regulation of mTOR-dependent signaling pathways by muscarinic receptors in SK-N-SH human neuroblastoma cells, and in human embryonic kidney (HEK) cell lines transfected with individual muscarinic receptor subtypes. In SK-N-SH cells, the acetylcholine analog carbachol stimulated phosphorylation of the ribosomal S6 protein, a downstream target of mTOR. The sensitivity of the response to subtype-selective muscarinic receptor antagonists indicated that it was mediated by M3 receptors. Carbachol-evoked S6 phosphorylation was blocked by the mTOR inhibitor rapamycin, but was independent of phosphoinositide 3-kinase activation. The response was significantly reduced by the mitogen-activated protein kinase kinase (MEK) inhibitor U0126, which also inhibited carbachol-evoked S6 phosphorylation in HEK cells expressing M2 receptors, but was ineffective in M3 receptor-expressing HEK cells, although carbachol activated MAPK in both transfected lines. The p90 ribosomal S6 kinase has been implicated in mTOR regulation by phorbol esters, but was not activated by carbachol in any of the cell lines tested. The protein kinase C inhibitor bisindolylmaleimide I reduced carbachol-stimulated S6 phosphorylation in SK-N-SH cells, and in HEK cells expressing M3 receptors, but not in HEK cells expressing M2 receptors. The results demonstrate that multiple muscarinic receptor subtypes regulate mTOR, and that both MAPK-dependent and -independent mechanisms may mediate the response in a cell context-specific manner." @default.
• W2060763806 created "2016-06-24" @default.
• W2060763806 creator A5043095398 @default.
• W2060763806 creator A5086674512 @default.
• W2060763806 date "2008-08-01" @default.
• W2060763806 modified "2023-10-06" @default.
• W2060763806 title "Differential regulation of mTOR-dependent S6 phosphorylation by muscarinic acetylcholine receptor subtypes" @default.
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• W2060763806 doi "https://doi.org/10.1002/jcb.21745" @default.
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