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Skeletal muscle handles ~80-90% of the insulin-induced glucose uptake. In skeletal muscle, insulin binding to its cell surface receptor triggers redistribution of intracellular glucose transporter GLUT4 protein to the cell surface, enabling facilitated glucose uptake. In adipocytes, the eight-protein exocyst complex is an indispensable constituent in insulin-induced glucose uptake, as it is responsible for the targeted trafficking and plasma membrane-delivery of GLUT4. However, the role of the exocyst in skeletal muscle glucose uptake has never been investigated. Here we demonstrate that the exocyst is a necessary factor in insulin-induced glucose uptake in skeletal muscle cells as well. The exocyst complex colocalizes with GLUT4 storage vesicles in L6-GLUT4myc myoblasts at a basal state and associates with these vesicles during their translocation to the plasma membrane after insulin signaling. Moreover, we show that the exocyst inhibitor endosidin-2 and a heterozygous knockout of Exoc5 in skeletal myoblast cells both lead to impaired GLUT4 trafficking to the plasma membrane and hinder glucose uptake in response to an insulin stimulus. Our research is the first to establish that the exocyst complex regulates insulin-induced GLUT4 exocytosis and glucose metabolism in muscle cells. A deeper knowledge of the role of the exocyst complex in skeletal muscle tissue may help our understanding of insulin resistance in type 2 diabetes.
Pubmed ID: 31593505 RIS Download
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This unknown targets IgG
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View all literature mentionsThis polyclonal targets EXOC5
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View all literature mentionsThis polyclonal targets EXOC1
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View all literature mentionsCell line L6-GLUT-4myc is a Transformed cell line with a species of origin Rattus norvegicus (Rat)
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View all literature mentionsThis polyclonal secondary targets IgG
View all literature mentionsThis monoclonal targets beta-Actin
View all literature mentionsCell line L6-GLUT-4myc is a Transformed cell line with a species of origin Rattus norvegicus (Rat)
View all literature mentionsThis unknown targets IgG
View all literature mentionsThis unknown targets IgG
View all literature mentionsThis unknown targets IgG
View all literature mentionsThis unknown targets IgG
View all literature mentionsThis polyclonal targets IgG
View all literature mentionsThis unknown targets IgG
View all literature mentionsThis polyclonal secondary targets IgG
View all literature mentionsThis polyclonal targets GLUT1
View all literature mentionsThis polyclonal targets ATP1A1
View all literature mentionsThis monoclonal targets ATP1A1, ATP1A2, ATP1A3
View all literature mentionsThis monoclonal targets myosin, sarcomere (MHC)
View all literature mentionsThis monoclonal targets p-ERK 1/2 (pT202/pY204.22A)
View all literature mentionsThis monoclonal targets Phospho-AKT (Ser473)
View all literature mentionsThis monoclonal targets MYC tag
View all literature mentionsThis monoclonal targets GAPDH
View all literature mentionsThis monoclonal targets Exo70 (D-6)
View all literature mentionsThis polyclonal targets EXOC5
View all literature mentionsThis polyclonal targets EXOC1
View all literature mentionsThis monoclonal targets
View all literature mentionsThis polyclonal targets Dystrophin
View all literature mentionsThis monoclonal targets COX IV (3E11) Rabbit mAb
View all literature mentionsThis monoclonal targets beta-Actin
View all literature mentionsThis monoclonal targets MYC tag
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