Microtubule network is required for insulin-induced signal transduction and actin remodeling.
Both microtubule and actin are required for insulin-induced glucose uptake. However, the roles of these two cytoskeletons and their relationship in insulin action still remain unclear. In this work, we examined the morphological change of microtubule/actin and their involvement in insulin signal transduction using rat skeletal muscle cells. Insulin rapidly led to microtubule clustering from ventral to dorsal surface of the cell. Microtubule filaments were rearranged to create space where new actin structures formed. Disruption of microtubule prevented insulin-induced actin remodeling and distal insulin signal transduction, with reduction in surface glucose transporter isoform 4 (GLUT4) and glucose uptake. Though microtubule mediated actin remodeling through PKCζ, reorganization of microtubule depended on tyrosine phosphorylation of insulin receptor, the mechanism is different from insulin-induced actin remodeling, which relied on the activity of PI3-kinase and PKCζ. We propose that microtubule network is required for insulin-induced signal transduction and actin remodeling in skeletal muscle cells.
T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T1 T20 T21 T22 T23 T24 T25 T26 T2 T3 T4 T5 T6 T7 T8 T9
GENE-N GENE-N GENE-Y GENE-N GENE-N GENE-N GENE-N GENE-Y GENE-Y GENE-N CHEMICAL GENE-Y GENE-Y GENE-N GENE-N GENE-N GENE-Y GENE-Y CHEMICAL CHEMICAL CHEMICAL GENE-N GENE-N GENE-Y GENE-N GENE-N
insulin Insulin insulin actin insulin actin insulin glucose transporter isoform 4 GLUT4 actin glucose PKCζ insulin receptor insulin actin PI3-kinase PKCζ insulin glucose glucose tyrosine insulin actin insulin actin actin