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- W2213248838 abstract "Autophagically mediated proteolysis in the perfused rat liver is under complex multiphasic control by a small group of amino acids dominated by leucine. Because there have been no prior reports of such regulation in the isolated hepatocyte, our goal was to determine whether it is a manifestation of interactions between diverse cells in the intact liver or, alternatively, the expression of a unique control mechanism within a single population of cells. Hepatocytes were isolated from livers of ad libitum-fed rats and incubated with cycloheximide at low density (approximately 10(6) cells/ml) for the determination of valine release. As in perfusion experiments with synchronously fed rats, proteolytic responses to leucine in cells from fed rats were mediated through two inhibitory mechanisms that alternated randomly on a day-to-day basis. The first (L) represented a typical multiphasic dose-response with low- and high-concentration inhibition separated by a sharp zonal loss of inhibition that could be abolished by alanine. The second (H) mediated inhibition only at high concentrations. It disappeared after 24 h of starvation, leaving L as the prevailing mode. The findings indicate that both macroautophagy and the multiphasic mechanism for regulating it coexist in a single population of hepatocytes, making the cells suitable for studies aimed at defining the putative plasma membrane site of leucine recognition." @default.
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- W2213248838 date "1994-02-01" @default.
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- W2213248838 title "Multiphasic control of proteolysis by leucine and alanine in the isolated rat hepatocyte" @default.
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- W2213248838 doi "https://doi.org/10.1152/ajpcell.1994.266.2.c455" @default.
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