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We studied the in vivo and in vitro effect of p-chlorophenoxyisobutyrate (CPIB) on insulin binding and glucose transport in isolated rat adipocytes. In the in vitro study, adipocytes were incubated with 1mM of CPIB for 2 h at 37 degrees C, pH 7.4, and then insulin binding (37 degrees C, 60 min) and 3-0-methylglucose transport (37 degrees C, 2s) were measured. Incubation with CPIB did not affect either insulin binding or glucose transport in the cells. The addition of insulin (10 ng/ml) with CPIB to the incubation media also did not affect the following insulin binding and glucose transport. In the in vivo study, rats were fed a high sucrose-diet containing 0.25% CPIB for 7 days. Serum cholesterol, plasma free fatty acid, and insulin levels were significantly decreased in the CPIB-treated rats. The treated rats demonstrated an almost 2 fold increased maximal binding capacity for insulin (189,000 sites/cell for treated vs 123,000 sites/cell for control cells). Basal glucose transport (glucose transport in the absence of insulin) significantly decreased in the CPIB-treated rats, although insulin-stimulated glucose transport was comparable in treated and control cells. Thus, CPIB might have no direct effect on glucose transport and insulin binding, as determined by the in vitro studies. Furthermore, a relatively short-term in vivo treatment with CPIB, such as 7 days, did not stimulate glucose transport.

In vivo and in vitro effect of p-chlorophenoxyisobutyrate on insulin binding and glucose transport in isolated rat adipocytes.