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- W7520862 abstract "Kidney cortex, red medulla and white medulla were separated into nuclei, mitochondria, microsomal and 105000g supernatant fractions. Assay of RNAase (ribonuclease) activity at pH7.8 revealed that, for each subcellular fraction, activity was much greater in cortex than in red or white medulla; this was true for both free RNAase and total (free plus latent) RNAase. For example, the free RNAase activity in the 105000g supernatant of cortex was 5 and 8 times higher than in red and white medulla respectively. No latent RNAase activity was found in any particulate fraction. Latent supernatant RNAase activities (suggesting presence of bound RNAase inhibitor) were similar in cortex and medulla. The cortex supernatant contained minimal free RNAase inhibitor, whereas that of the red and white medulla showed about one-third and one-tenth respectively of the inhibitor activity measured in liver. Adrenalectomy did not change RNAase activity in any fraction nor the content of free RNAase inhibitor in the kidney supernatant, but did decrease the liver RNAase inhibitor content by 40%. In supernatants from mouse kidney, both free and total RNAase activities of both cortex and red medulla were similar to those of rat red medulla. Mouse cortex contained appreciably higher amounts of free RNAase inhibitor than rat cortex. The difference between the rat and mouse cortical RNAase activity and inhibitor content may help explain the relative ease with which satisfactory renal polyribosome profiles were obtained from mouse kidneys. Our results, as well as those of Kline & Liberti [(1973) Biochem. Biophys. Res. Commun.52, 1271–1277], showing that renal red and white medulla are more active than cortex in protein synthesis, are consistent with the hypothesis that the RNAase–RNAase-inhibitor system may participate in the regulation of protein synthesis." @default.
- W7520862 created "2016-06-24" @default.
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- W7520862 date "1977-05-15" @default.
- W7520862 modified "2023-10-14" @default.
- W7520862 title "Regional differences in ribonuclease content of rat and mouse kidney" @default.
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- W7520862 doi "https://doi.org/10.1042/bj1640371" @default.
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