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  • Lanner, JT, et al. (författare)
  • The role of Ca2+ influx for insulin-mediated glucose uptake in skeletal muscle
  • 2006
  • Ingår i: Diabetes. - : American Diabetes Association. - 0012-1797 .- 1939-327X. ; 55:7, s. 2077-2083
  • Tidskriftsartikel (refereegranskat)abstract
    • The involvement of Ca2+ in insulin-mediated glucose uptake is uncertain. We measured Ca2+ influx (as Mn2+ quenching or Ba2+ influx) and 2-deoxyglucose (2-DG) uptake in single muscle fibers isolated from limbs of adult mice; 2-DG uptake was also measured in isolated whole muscles. Exposure to insulin increased the Ca2+ influx in single muscle cells. Ca2+ influx in the presence of insulin was decreased by 2-aminoethoxydiphenyl borate (2-APB) and increased by the membrane-permeable diacylglycerol analog 1-oleyl-2-acetyl-sn-glycerol (OAG), agents frequently used to block and activate, respectively, nonselective cation channels. Maneuvers that decreased Ca2+ influx in the presence of insulin also decreased 2-DG uptake, whereas increased Ca2+ influx was associated with increased insulin-mediated glucose uptake in isolated single cells and whole muscles from both normal and insulin-resistant obese ob/ob mice. 2-APB and OAG affected neither basal nor hypoxia- or contraction-mediated 2-DG uptake. 2-APB did not inhibit the insulin-mediated activation of protein kinase B or extracellular signal–related kinase 1/2 in whole muscles. In conclusion, alterations in Ca2+ influx specifically modulate insulin-mediated glucose uptake in both normal and insulin-resistant skeletal muscle. Moreover, the present results indicate that Ca2+ acts late in the insulin signaling pathway, for instance, in the GLUT4 translocation to the plasma membrane.
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