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• W2041824073 abstract "The insulin signal transduction cascade provides a number of sites downstream of the insulin receptor (IR) for cross-talk from other signaling pathways. Tyrosine phosphorylation of the IR substrates IRS-1/2 and metabolic insulin-mimetic activity in insulin-responsive cells can be provoked by soluble phosphoinositolglycans (PIG), which trigger redistribution from detergent-insoluble glycolipid-enriched raft domains (DIGs) to other areas of the plasma membrane and thereby activation of nonreceptor tyrosine kinases (NRTK) [Müller, G., Jung, C., Wied, S., Welte, S., Jordan, H., and Frick, W. (2001) Mol. Cell. Biol. 21, 4553-4567]. Here we describe that stimulation of glucose transport in isolated rat adipocytes by a different stimulus, the sulfonylurea glimepiride, is also based on IRS-1/2 tyrosine phosphorylation and downstream insulin-mimetic signaling involving activation of the NRTK, pp59(Lyn), and pp125(Fak), as well as tyrosine phosphoryation of the DIGs component caveolin. As is the case for PIG 41, glimepiride causes the concentration-dependent dissociation of pp59(Lyn) from caveolin and release of this NRTK and the glycosyl-phosphatidylinositol-anchored (GPI) proteins, Gce1 and 5'-nucleotidase, from total and anti-caveolin-immunoisolated DIGs. This results in their movement to detergent-insoluble raft domains of higher buoyant density (non-DIGs areas). IRS-1/2 tyrosine phosphorylation and glucose transport activation by both glimepiride and PIG are blocked by introduction into adipocytes of the caveolin scaffolding domain peptide which mimicks the negative effect of caveolin on pp59(Lyn) activity. Tyrosine phosphorylation of the NRTK, IRS-1/2, and caveolin as well as release of the NRTK and GPI proteins from DIGs and their redistribution into non-DIGs areas in response to PIG is also inhibited by treatment of intact adipocytes with either trypsin plus salt or N-ethylmaleimide (NEM). In contrast, the putative trypsin/salt/NEM-sensitive cell surface component (CIR) is not required for glimepiride-induced glucose transport, IRS-1/2 tyrosine phosphorylation, and redistribution of GPI proteins and NRTK. The data suggest that CIR is involved in concentrating signaling molecules at DIGs vs detergent-insoluble non-DIGs areas. These inhibitory interactions are relieved in response to putative physiological (PIG) or pharmacological (sulfonylurea) stimuli via different molecular mechanisms (dependent on or independent of CIR, respectively) thereby inducing IR-independent positive cross-talk to metabolic insulin signaling." @default.
• W2041824073 created "2016-06-24" @default.
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• W2041824073 date "2001-11-07" @default.
• W2041824073 modified "2023-10-03" @default.
• W2041824073 title "Insulin-Mimetic Signaling by the Sulfonylurea Glimepiride and Phosphoinositolglycans Involves Distinct Mechanisms for Redistribution of Lipid Raft Components" @default.
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• W2041824073 doi "https://doi.org/10.1021/bi0108352" @default.
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