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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Alterations of protein kinase C isozyme and substrate proteins in mouse brain after electroconvulsive seizures.

Protein kinase C (PKC) activity, Western blot analysis of PKC alpha, beta, gamma, epsilon and zeta with isozyme-specific antibodies, endogenous substrate protein phosphorylation, and Western blot analysis of neuromodulin, were studied in mouse brain after repeated electroconvulsive shock. The PKC isozymes and endogenous substrates in the crude cytosolic and membrane fractions were partially purified on DE-52 columns eluted with buffer containing 100 or 200 mM KCl. The kinase activity assayed by phosphorylation of exogenous histone was increased in the 200 mM KCl eluates of both the cytosol and membrane fractions from electroshocked mice. Further analysis by immunoblotting demonstrated that this increased activity was due to an increase in the PKC gamma isozyme. The level of the novel type isozymes, epsilon and zeta, was not altered in electroshocked mice. An in vitro phosphorylation study showed that the endogenous substrate, 17 kDa neurogranin, was mostly eluted by 100 mM KCl. In contrast, the 43 kDa neuromodulin only appeared in the 200 mM KCl eluate, according to autoradiography, SDS-PAGE and Western blot analysis; its level was found to be increased in the membrane fraction of electroshocked mice, as demonstrated by in vitro phosphorylation studies. Therefore, an increase in both PKC gamma and neuromodulin contributed to the increased phosphorylation of neuromodulin during electroshock seizure.[1]


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