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• W2049402214 endingPage "4840" @default.
• W2049402214 startingPage "4830" @default.
• W2049402214 abstract "The post-translational regulation of aromatase has not been well characterized as compared with transcriptional regulation. Several studies of post-translational regulation have focused on decreases in catalytic activity following phosphorylation. We report here dual post-translational regulation of aromatase, at the catalytic activity and protein levels. Microsomal aromatase prepared from JEG-3 cells was rapidly inactivated and subsequently degraded in the presence of a cytosolic fraction with calcium, magnesium, and ATP. In a reconstituted system consisting of microsomal and cytosolic fractions, aromatase was protected from protein degradation by treatment with alkaline phosphatase, whereas degradation was enhanced by treatment with calcineurin inhibitors (FK506 and cyclosporin A). Furthermore, aromatase was protected from degradation by treatment with kinase inhibitors, especially the calcium/calmodulin kinase inhibitors KN62 and KN93. Similarly to the reconstituted system, aromatase in cultured JEG-3 cells was protected from degradation by KN93, whereas FK503 increased degradation in the presence of cycloheximide, although cellular aromatase mRNA levels were unchanged by these reagents. Knockdown of calcineurin and calcium/calmodulin kinase II (CaMKII) with small interfering RNAs resulted in a dose-dependent increase in aromatase degradation and protection from degradation, respectively. The cytosol fraction-dependent phosphorylation of microsomal aromatase was inhibited by calcineurin, KN62, and KN93, and promoted by CaMKII and FK506. These results indicate that aromatase is regulated acutely at the catalytic activity level and subsequently at the enzyme content level by CaMKII/calcineurin-dependent phosphorylation/dephosphorylation." @default.
• W2049402214 created "2016-06-24" @default.
• W2049402214 creator A5015103500 @default.
• W2049402214 creator A5070386484 @default.
• W2049402214 date "2014-09-15" @default.
• W2049402214 modified "2023-10-05" @default.
• W2049402214 title "Post-translational dual regulation of cytochrome P450 aromatase at the catalytic and protein levels by phosphorylation/dephosphorylation" @default.
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• W2049402214 doi "https://doi.org/10.1111/febs.13021" @default.
• W2049402214 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25158681" @default.
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