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Abstract
Recently we reported that individuals with high scores in standardized hostility evaluation tests, when placed in a environment, may have an association with increases in a blood-borne mitogenic substance(s) for arterial smooth muscle cells. To further investigate the molecular basis for such an association, PDS [plasma derived serum with platelet derived growth factor (PDGF) removed] from individuals showing the greatest differential pre/post-stress mitogenic activity, were tested for ability to modulate changes in the steady state of the c-myc mRNA in cultured VSMC (vascular smooth muscle cells) by Northern blot analysis. Post-stress PDS resulted in a significant increase in c-myc mRNA, when compared with pre-stress PDS of the same individual. These results give further experimental support for the notion that stress (even in the form of transient, episodic psychological challenges) may affect the cardiovascular system via rapid elicited rises in serum mitogenic activity for VSMC.
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