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- W2023270735 abstract "Plasma membranes from liver of control rats or from chemical-induced hepatoma were prepared. The basal activity of adenylate cyclase was increased significantly in the rat plasma membranes of DEN-induced hepatoma compared to normal tissue. The glucagon-induced response on the cellular effector systems via guanine nucleotide-binding regulatory proteins (G proteins) was inhibited in hepatoma plasma membranes. These findings suggest that in hepatoma membranes, unlike normal hepatic membranes, the response to hormonal stimuli through regulatory G proteins results in a loss of response to glucagon, as well as to GTP plus glucagon or to GTPγS. However, the activating effects of forskolin, which catalyses the formation of cyclic AMP from ATP acting on the catalytic subunit, were to some extent retained. The methyltransferase-I behaved in the opposite direction to the adenylate cyclase, showing a decreased activity in hepatoma plasma membranes compared to control membranes. In contrast, the activity of the ecto-5′-nucleotidase was significantly increased in hepatoma. These enzymatic changes have been found to influence the membrane fluidity and to be responsible for the ultrastructural modifications of hepatoma plasma membranes which are induced by chemical carcinogens." @default.
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- W2023270735 date "1995-12-01" @default.
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- W2023270735 title "Enzymatic, biophysical and ultrastructural changes of plasma membranes in chemical-induced rat hepatoma" @default.
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- W2023270735 doi "https://doi.org/10.1002/cbf.290130406" @default.
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