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[Effect of partial hepatectomy on the invertor mechanism of regulation of the Na+,K+-ATPase activity in hepatocytes of rats of various ages].

Age peculiarities of partial hepatectomy effect on the hepatocytes plasma membrane Na+, K(+)-ATPase activity and its insulin-induced stimulation has been studied. It has been shown that partial hepatectomy does not change basal Na+, K(+)-ATPase activity in adult rats. In old partial hepatectomised rats Na+, K(+)-ATPase activity is slightly higher than in control old rats, although this increase is not statistically significant. At the same time, partial hepatectomy acts differently on the insulin-induced Na+, K(+)-ATPase activation in adult and old rats. Insulin activates Na+, K(+)-ATPase at the same extent both in control and partial hepatectomized adult animals. In old hepatectomized rats, but not in old control animals, insulin stimulates Na+, K(+)-ATPase activity as well as. Thus hepatectomy "rejuvenates" old hepatocytes and results in recovery of invertor mechanism of Na+, K(+)-ATPase activation.