Abstract
Myotube cultures from patients with type 2 diabetes mellitus (T2DM) represent an experimental in vitro model of T2DM that offers a possibility to perform gene expression studies under standardized conditions. During a time-course of insulin stimulation (1 microM) at 5.5 mM glucose for 0 (no insulin), 0.5, 1, 2, 4, 8, and 24 h, mRNA contents were analyzed in human myotubes for each time point using Affymetrix DNA chip technology. Insulin treatment induced an inflammatory and pro-angiogenic response in the myotubes, with expression of early response factors followed by inflammatory chemokines, metabolic enzymes, and finally cell cycle regulating genes. One-hundred-forty-four genes were differentially expressed in myotubes from donors with type 2 diabetes compared with control subjects, including HSP70, apolipoprotein D/E, tropomyosin, myosin, and actin previously reported from in vivo studies of diabetic skeletal muscle. We conclude, (i) that insulin induces a time-dependent inflammatory and pro-angiogenic transcriptional response in cultured human myotubes, (ii) that myotubes in vitro retain a gene expression pattern specific for type 2 diabetes and sharing five genes with that of type 2 diabetic skeletal muscle in vivo, and (ii...Continue Reading
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