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Role of phosphoinositide-derived second messengers in mediating anti-IgM-induced growth arrest of WEHI-231 B lymphoma cells.

D M Page and A L DeFranco
J Immunol June 1, 1988, 140 (11) 3717-3726;
D M Page
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A L DeFranco
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Abstract

Anti-IgM irreversibly inhibits the growth of WEHI-231 B lymphoma cells and induces phosphoinositide hydrolysis--producing diacylglycerol, which activates protein kinase C, inositol 1,4,5-trisphosphate, which induces the release of calcium from intracellular storage sites into the cytoplasm, and other inositol polyphosphates. The roles of two of the possible second messengers, cytoplasmic free calcium and diacylglycerol, in mediating the action of anti-IgM on WEHI-231 cells were assessed by elevating [Ca2+]i with ionomycin and by activating protein kinase C with phorbol 12,13-dibutyrate (PdBu). The combination of 250 nM ionomycin and 4 to 7 nM PdBu was found to cause growth arrest and cell volume decrease responses in WEHI-231 cells which were similar to those caused by anti-IgM, although clearly slower. Both anti-IgM and the combination of mimicking reagents induced growth arrest of WEHI-231 cells in the G1 phase of the cell cycle. In both cases, this growth arrest was mitigated by addition of bacterial LPS. Moreover, 250 nM ionomycin plus 4 to 7 nM PdBu did not inhibit the growth of two other murine B lymphoma cell lines, each of which did exhibit increased phosphoinositide hydrolysis but not growth arrest in response to anti-Ig. Taken together, these results suggest that ionomycin and PdBu, at the concentrations used, did not inhibit WEHI-231 growth by general toxicity, but rather by mimicking the effects of the natural second messengers generated from Ag receptor cross-linking. Thus, the phosphoinositide-derived second messengers Ca2+i and diacylglycerol are capable of playing important roles in mediating the action of anti-IgM on WEHI-231 B lymphoma cells. However, the response of WEHI-231 cells to anti-IgM could not be fully reproduced with ionomycin and phorbol diester. These results suggest that another second messenger induced by anti-IgM may also play an important role in mediating the growth arrest of these cells.

  • Copyright © 1988 by American Association of Immunologists

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The Journal of Immunology
Vol. 140, Issue 11
1 Jun 1988
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Role of phosphoinositide-derived second messengers in mediating anti-IgM-induced growth arrest of WEHI-231 B lymphoma cells.
D M Page, A L DeFranco
The Journal of Immunology June 1, 1988, 140 (11) 3717-3726;

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Role of phosphoinositide-derived second messengers in mediating anti-IgM-induced growth arrest of WEHI-231 B lymphoma cells.
D M Page, A L DeFranco
The Journal of Immunology June 1, 1988, 140 (11) 3717-3726;
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Print ISSN 0022-1767        Online ISSN 1550-6606