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- W2089672387 abstract "The intracisternal injection of either all-trans-retinoic acid or [α]-difluoromethylornithine (DFMO) into the brain of 9-day-old mice blocked (90%) phorbol ester-induced ornithine decarboxylase (ODC, EC 4.1.1.17) activity in a concentration-dependent fashion; this inhibition was not evident with the use of the biologically impotent furyl analog of retinoic acid. In a similar manner, retinoic acid reduced the soluble protein kinase-C (PK-C) activity by 60% as well as total EGTA-sensitive kinase activity (66%) associated with the plasma membrane. Sixty-six percent of the retinoic acid-induced loss of PK-C activity in the soluble fraction could be accounted for by the translocation of PK-C to the plasma membrane as measured by the specific binding of 12-O-[3H]tetradecanylphorbol-13-acetate (TPA). DFMO and furyl-retinoic acid were not effective in altering PK-C activity or TPA binding to PK-C. In the presence of retinoic acid, however, there was a 2.3-fold increase in specific [3H] TPA binding in the plasma membrane fraction, which was 3.4-fold greater than that lost from the cytosol. Because retinoids do not directly affect TPA binding to PK-C, the data suggest that (i) the presence of retinoic acid results in the exposure of heretofore cryptic TPA-binding sites in the membrane, where this binding is most likely related to the alteration of membrane structure and (ii) de novo ODC induction is not required for retinoid-dependent inhibition of PK-C, although the TPA induction of PK-C appears to be necessary with regard to ODC induction." @default.
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- W2089672387 date "2004-07-01" @default.
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- W2089672387 title "P4-175 The proteasome regulates presenilin 1 levels during apoptosis" @default.
- W2089672387 doi "https://doi.org/10.1016/s0197-4580(04)81733-0" @default.
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