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- W1492589327 abstract "Hepatic ornithine aminotransferase (EC 2.6.1.13) (OAT) is a mitochondrial matrix enzyme that plays a role in amino acid catabolism and in gluconeogenesis. In rats, the synthesis of hepatic OAT is regulated by glucagon, dietary protein, and glucose. Serum-free primary cultures of adult rat hepatocytes were used to demonstrate that glucagon, cyclic AMP, and glucose are able to alter OAT synthesis by a direct action on hepatocytes. The rates of OAT synthesis were measured by immunoprecipitation of pulse-labeled OAT with an affinity-purified monospecific antibody. Ten hours after cyclic AMP addition to the culture medium, the relative rate of OAT synthesis reached a peak value that was six- to eightfold above the control rate. OAT activity accumulated more slowly, reaching a level that was approximately threefold above the control by 24 h. The inclusion of glucose in the culture medium inhibited the increases in OAT synthesis and activity in a dose-dependent manner. Although synthesized as a precursor (pOAT), no pOAT was detected under control, induced, or carbohydrate-inhibited conditions; this suggests that pOAT processing may not be a regulatory site of OAT expression. By following the loss of labeled OAT, a half-life of 34 h in these cultures under all of the above conditions was observed. Regulation of OAT levels in cultured hepatocytes appears to be achieved primarily through changes in the rate of OAT synthesis." @default.
- W1492589327 created "2016-06-24" @default.
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- W1492589327 date "1988-01-01" @default.
- W1492589327 modified "2023-10-14" @default.
- W1492589327 title "Diagnostic enzymology" @default.
- W1492589327 doi "https://doi.org/10.1016/0307-4412(88)90035-0" @default.
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