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• W2041760028 abstract "The effects of glucagon on the subacinar distribution of hepatic transmembrane potentials were studied in the perfused fasted rat liver. The livers were perfused with a Krebs-Henseleit buffer, and membrane potentials of matched periportal and pericentral hepatocytes were determined using glass microelectrodes. Lactate- and pyruvate-induced glucose production and O2 uptake were potentiated by 10−8 M glucagon. Twenty-five micromoles 8-bromoadenosine 3′,5′cyclic monophosphate (8-BrcAMP) exhibited stimulatory effects similar, in terms of glucose production and O2 uptake to those of glucagon. Octanol (0.1 and 0.5 mM) had no effect on glucose production but reversibly increased O2 uptake by 16% to 30% over all experiments. Under basal conditions (no exogenous substrate) hepatocyte membrane potentials averaged approximately −27 mV, and no gradients were found between periportal and pericentral hepatocytes. Addition of lactate and pyruvate produced hyperpolarization in all hepatocytes. However, there was a small but statistically significant gradient produced across the hepatic acinus in membrane potential, i.e., the hyperpolarization was higher in the periportal region compared with the pericentral region. Glucagon and 8-BrcAMP induced marked hyperpolarization in periportal and pericentral hepatocytes with no gradients across the acinus. Although no changes were found under basal and lactate plus pyruvate, 0.5 mM octanol induced heterogeneity of membrane potential during glucagon and 8-BrcAMP stimulation. Our findings suggest that glucagon-induced homogeneity of membrane potential may be mediated by increased gap junctional coupling. In addition, cAMP may be responsible for the increase in the intercellular communication during glucagon stimulation." @default.
• W2041760028 created "2016-06-24" @default.
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• W2041760028 date "2004-07-01" @default.
• W2041760028 modified "2023-09-24" @default.
• W2041760028 title "GLUCAGON INCREASES GAP JUNCTIONAL INTERCELLULAR COMMUNICATION VIA cAMP IN THE ISOLATED PERFUSED RAT LIVER" @default.
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• W2041760028 doi "https://doi.org/10.1097/01.shk.0000129196.08094.e3" @default.
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