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Induction and regulation of casein kinase II during B lymphocyte activation.

M DeBenedette and E C Snow
J Immunol November 1, 1991, 147 (9) 2839-2845;
M DeBenedette
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E C Snow
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Abstract

This study evaluates the regulation of casein kinase II (CK II) activity in resting B cells induced to enter the cell cycle. The induction of B cell cycle progression PMA and ionomycin results in an oscillatory expression of CK II. This kinase activity is also elicited after direct physical interaction between B cells and activated, fixed Th cells, indicating that the increase seen in CK II activity is probably associated with the delivery of the competence-inducing signal to resting B cells. The selective inhibition of ornithine decarboxylase (ODC), the rate-limiting enzyme for polyamine biosynthesis, during PMA and ionomycin-induction of B cell cycle progression, inhibits the expression of CK II activity. The addition of polyamines to cytosolic preparations recovered from cells in which ODC is inhibited results in the appearance of CK II activity, showing that the ODC inhibitor does not directly inhibit the kinase. The treatment of B cells with cycloheximide results in the appearance of CK II activity within 15 min, and this induction is partially explainable by a cycloheximide-elicited increase in cellular levels of polyamines. The artificial elevation of cellular levels of cAMP simultaneous with the addition of PMA and ionomycin results in a 150 to 200% increase in detectable CK II levels, suggesting that the cAMP-dependent signaling cascade may participate during the early regulation of CK II. In contrast, the inhibition of protein kinase C does not adversely influence the early expression of CK II, while actually enhancing kinase activity by 18 h poststimulation.

  • Copyright © 1991 by American Association of Immunologists

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The Journal of Immunology
Vol. 147, Issue 9
1 Nov 1991
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Induction and regulation of casein kinase II during B lymphocyte activation.
M DeBenedette, E C Snow
The Journal of Immunology November 1, 1991, 147 (9) 2839-2845;

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Induction and regulation of casein kinase II during B lymphocyte activation.
M DeBenedette, E C Snow
The Journal of Immunology November 1, 1991, 147 (9) 2839-2845;
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Print ISSN 0022-1767        Online ISSN 1550-6606