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- ArticleShelepov VP, Davydova SIa, Shapot VS.Biokhimiia. 1978 Mar;43(3):539-44.Plasma membranes (PM) of helathy rats as well as those hepatomas and PM of tumor-bearing rats were found (radioreceptor assay) to have apparently two groups of receptors for insulin with a high and low affinity for the hormone respectively and different insulin-binding capacities. Kass values of the receptors with a high affinity for insulin are drastically decreased in the PM of ascites Zajdela hepatoma (AZH) and of solid hepatoma 27 (SH-27) as well as in the liver of SH-27-bearing animals, but not in the liver of the AZH-bearing rats. Kass values of the receptors with a low affinity for insulin in the PM of AZH and in those of the liver of AZH-bearing rats appear nearly normal. In contrary, above Kass the receptors in the PM of SH-27 and SH-27-bearing animals are significantly decreased. The insulin-binding capacity of the receptors with a high affinity for the hormone in the PM of SH-27, AZH and the liver of both tumor-bearing rats is shown to be significantly higher than that in the PM of normal animals. The same property of the receptors with a low is affinity in the PM of the hepatomas and theliver of their hosts is also increased, especially in the PM of SH-27 and of the liver of SH-27-carring rats.