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Thrombospondin 1 Suppresses Insulin Signaling in C2C12 Myotubes.
Kobe Journal of Medical Sciences 2016 June 17
Thrombospondin 1 (TSP-1) is abundantly expressed in visceral adipose tissue and this expression is up-regulated in obese humans and rodents. Recent studies showed that genetic deletion of TSP-1 protects mice from diet-induced insulin resistance. However, the molecular mechanism is largely unknown. In this study, we examined the effect of recombinant TSP-1 on insulin signaling in cultured cells from insulin sensitive tissues to investigate whether TSP-1 could act as an adipokine. Here we show that treatment with recombinant TSP-1 suppressed insulin signaling in cultured muscle cells, which was accompanied by the activation of stress signaling such as JNK, p38, and IKK. These results suggest that TSP-1 acts as an adipokine which is involved in the pathogenesis of obesity-induced insulin resistance. Thus, TSP-1 could be a potential target for the treatment of insulin resistance and metabolic disease related to insulin resistance.
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