Diacylglycerol, but not inositol 1,4,5-trisphosphate, accounts for platelet-derived growth factor-stimulated proliferation of BALB 3T3 cells
✍ Scribed by Reiko Suzuki-Sekimori; Koozi Matuoka; Yoshitaka Nagai; Tadaomi Takenawa
- Publisher
- John Wiley and Sons
- Year
- 1989
- Tongue
- English
- Weight
- 744 KB
- Volume
- 140
- Category
- Article
- ISSN
- 0021-9541
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✦ Synopsis
Recently we found that an intracellular event related to phosphatidylinositol 4,5bisphosphate (PIP2) is crucial for platelet-derived growth factor (PDGF)-induced mitogenesis in fibroblastic cells (Matuoka, K., et al.: Science 239:640-643, 1988). In the present study we examined the mitogenic effects of PIPl and its hydrolysis products introduced into the cytoplasm of BALB 3T3 cells by microinjection to confirm the role of PIPL hydrolysis in PDGF stimulation of cell proliferation. Injection of 1,2-dioleylglycerol (diolein) into serum-deprived quiescent cells induced DNA synthesis with the same time course as that induced by exposure of the cells to PDGF and, in the presence of PDGF, caused no additional increase in the cell population entering S phase. The injection of PIP2, inositol 1,4,5-trisphosphate, or 1,2-dioIeylphosphatidic acid into the cells did not induce mitogenesis. Consistent results were obtained in experiments in which the cells were exposed to 1 -oleyl-2-acetylglycerol (OAG) and ionomycin; namely, OAG stimulated proliferation of BALB 3T3 cells, but ionomycin did not induce any mitogenesis. Desensitization of the protein kinase C pathway by prolonged exposure of the cells to phorbol ester abolished the induction of cell proliferation by subsequent injection of diolein or exposure to phorbol ester or OAG as well as by PDGF challenge. These findings strongly suggest that activation of the protein kinase C system following formation of diacylglycerol by PIP-hydrolysis is mainly responsible for the mitogenic action of PDGF on BALB 3T3 cells.