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High D-glucose stimulates the cell cycle from the G1 to the S and M phases, but has no competent effect on the G0 phase, in vascular smooth muscle cells.

The effects of high (28mM) D-glucose (HG) on the cell cycle progression were investigated in rat aorta vascular smooth muscle cells (VSMCs) in primary culture, using an immunocytochemical analysis of cell-cycle-specific nuclear antigens. HG had no effect on the cell cycle of the serum-deprived G0 cells, whereas platelet-derived growth factor (PDGF) stimulated the entry of the G0 cells to the G1 phase without a further progression to the S and M phases. HG, but neither mannitol nor L-glucose, stimulated the progression of the PDGF-pretreated G1 cells to the S and M phases, which was blocked by calphostin-C, a protein kinase C (PKC) blocker. HG did not affect the cytosolic Ca2+ concentration ([Ca2+]i). These data suggest that HG has no competent effect on the G0 cells and acts as a progression growth factor (to stimulate the cell cycle from the G1 to the S/M) in VSMCs through the mechanism, which may be insensitive to [Ca2+]i and mediated by PKC.