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It has been previously shown that Subetta (a drug containing released-active forms of antibodies to the insulin receptor β-subunit and antibodies to endothelial nitric oxide synthase) stimulated insulin-induced adiponectin production by mature human adipocytes in the absence of insulin. Therefore, it was assumed that Subetta could activate the insulin receptor. To confirm this hypothesis, the capacity of Subetta to activate the insulin receptor in mature human adipocytes in the absence or presence of the insulin was investigated. Cells were incubated either with Subetta or with vehicle, or with basal medium for 3 days. Then, adipocytes were treated with water or insulin (100 n m ) for 15 min. Following treatment, lysates were prepared and phosphorylation of insulin receptor β-subunits was analyzed by western blot analysis. It was shown that Subetta significantly increased ( P <0.001) the ‘phosphorylated-insulin receptor β-subunit/total insulin receptor β-subunit' ratios in both the presence and the absence of insulin. These results support previously published data and indicate that Subetta could activate the insulin receptor through the effect on its β-subunits, whose conformational state is essential for insulin receptor activation. This action might serve as one of the primary mechanisms of the drug's antidiabetic effect.

Subetta increases phosphorylation of insulin receptor β-subunit alone and in the presence of insulin