Termination of insulin-induced hexose transport in adipocytes.

The hexose transport of insulin-pretreated (80 pM) adipocytes remained elevated for at least 45 min when the cells were depleted of ATP by treatment with dinitrophenol. On the other hand, the half-time of deactivation of hexose transport in insulin-pretreated cells was of the same magnitude as that of dissociation of receptor-bound insulin both in the absence and presence of glucose (about 8 min). Thus, a high ATP-level, but not ongoing glucose metabolism appears to be important for termination of the insulin effect shortly after dissociation of insulin from its receptor.