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- W2000748530 abstract "Studies on the subcellular distribution of protein kinase activity in popped estrous follicles from rabbit ovaries revealed that 15% of the total cellular protein kinase activity was compartmentalized in the nuclear, mitochondrial, and microsomal fractions. About 50% of the particulate protein kinase activity was unaffected by the heat-stable protein kinase inhibitor and was thus cAMP-independent. The majority of cellular protein kinase activity was identified in the 105,000 X g supernatant fraction as cAMP-dependent. hCG- or coital-induced ovulation and subsequent corpus luteum (CL) formation, and hCG-induced luteal regression promoted changes and a redistribution of protein kinase activity among the subcellular fractions. In follicles, hCG promoted a transient decline of nuclear protein kinase activity as well as transient increases of the relative amount of protein kinases localized in the microsomal fractions before ovulation. In CL induced by a fertile mating, the specific activity as well as the total amount of protein kinases in the nuclear fraction were reduced 2-fold. Mitochondrial protein kinase activity from CL of pseudopregnancy and pregnancy was reduced 2-fold. The relative amount of protein kinase activity in microsomes of CL was increased 2-fold, but the specific activity was not affected. hCG-induced luteal regression resulted in a transient decline of the nuclear protein kinase activity in CL of 4-day pseudopregnant rabbits. In interstitial tissue, the specific activity of the nuclear protein kinase was increased over luteal levels, the mitochondrial-specific protein kinase remained at the reduced luteal levels, and the microsomal and cytosol protein kinase specific activities increased 2-fold. Studies with the heat-stable protein kinase inhibitor revealed that the hCG- or coital-induced redistribution of intracellular protein kinase affected both the cAMP-dependent and cAMP-independent activity to a similar degree and no changes of the relative distribution of cAMP-dependent vs. cAMP-independent activity were observed. These results indicate that the intracellular distribution and enzymatic activity of cAMP-dependent protein kinases in ovarian structures are subject to regulation by LH (hCG) and depend upon the various reproductive stages of the rabbit." @default.
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- W2000748530 date "1978-08-01" @default.
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- W2000748530 title "Rabbit Ovarian Protein Kinases. I. Effect of an Ovulatory Dose of Human Chorionic Gonadotropin or Luteinizing Hormone on the Subcellular Distribution of Follicular and Luteal Protein Kinases*" @default.
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- W2000748530 doi "https://doi.org/10.1210/endo-103-2-420" @default.
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