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- W2082582109 abstract "Abstract: We have investigated the role of protracted phosphatase inhibition and the consecutive protracted protein phosphorylation on neuronal viability. We found that in primary cultures of cerebellar granule neurons, the protracted (24-h) inhibition of the serine/threonine protein phosphatases 1 and 2A (EC 3.1.3.16) by treatment of the cultures with okadaic acid (OKA; 5–20 nM) caused neurotoxicity that could be inhibited by the protein kinase inhibitor l-(5-isoquinolinylsulfonyl)-2-methylpiperazine (H7) or by the previous down-regulation of the neuronal protein kinase C (PKC; ATP:protein phosphotransferase; EC 2.7.1.37). PKC was down-regulated by exposure of the cultures for 24 h to 100 nM phorbol 12-myristate 13-acetate (TPA). The effect of the drugs used in the viability studies on the pattern of protein phosphorylation was measured by quantitative autoradiography. In particular, the 50- and 80-kDa protein bands showed dramatic changes in the degree of phosphorylation: increase by OKA and brief TPA treatment; decrease by H7 or 24 h of TPA treatment; and inhibition of the OKA-induced increase by H7 or 24 h of TPA treatment. The results suggest that the protracted phosphorylation, in particular that mediated by PKC, may lead to neuronal death and are in line with our previous suggestion that prolonged PKC translocation is operative in glutamate neurotoxicity." @default.
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- W2082582109 date "1992-10-01" @default.
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- W2082582109 title "Pathological Phosphorylation Causes Neuronal Death: Effect of Okadaic Acid in Primary Culture of Cerebellar Granule Cells" @default.
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- W2082582109 doi "https://doi.org/10.1111/j.1471-4159.1992.tb08474.x" @default.
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