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- W2019957809 abstract "The metabolism of inositol 1,4,5-trisphosphate and inositol 1,3,4,5-tetrakisphosphate in homogenates and sub-fractions from normal rat liver and premalignant liver nodules was investigated. The activities of 5-phosphatase, expressed as pmol converted substrate per minute and mg protein, were equal when using the two substrates, and did not differ between normal and nodular homogenates. Subcellular fractions were purified by sequential steps of differential centrifugation and density gradient fractionation procedures. The total phosphatase activity was found to be distributed between cytosol (15%) and membraneous fractions (75%), with most of the enzyme activity residing in the plasma membranes. A doubling of phosphatase specific activity was seen in the nodular low density membrane fraction, containing Golgi apparatus and endosomes, as compared with normal liver. Inositol 1,4,5-trisphosphate 3-kinase activity was found to be exclusively cytosolic. No difference in this enzyme was seen between the two tissue types studied. Vasopressin (0.2 or 2 microM) had no effect either on phosphatase or kinase activity. The compartmentalization of inositol polyphosphate 5-phosphatase activity presents a possible explanation of earlier findings that premalignant liver tissue was able to respond with inositol 1,4,5-trisphosphate, but not inositol 1,3,4,5-tetrakisphosphate formation after agonist stimulation." @default.
- W2019957809 created "2016-06-24" @default.
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- W2019957809 date "1997-12-01" @default.
- W2019957809 modified "2023-09-25" @default.
- W2019957809 title "Inositol 1,4,5-trisphosphate turnover enzymes--activities and subcellular distribution in hepatocarcinogenesis" @default.
- W2019957809 doi "https://doi.org/10.1093/carcin/18.12.2447" @default.
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