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Proto-oncogene (c-fos, c-jun) and nuclear factor-kappa B (NF-kappaB) expression, as well as DNA synthesis, in aortic and cerebral vascular smooth muscle cells (VSMCs) were upregulated by a decrease in extracellular magnesium ions ([Mg2+]o). Upregulation of these transcriptional factors was inversely proportional to the [Mg2+]o and occurred over the pathophysiologic range of serum Mg2+ found in patients presenting with hypertension, ischemic heart disease, and stroke. Removal of extracellular Ca2+ ([Ca2+]o), use of nifedipine or protein kinase C (PKC) inhibitors prevented the upregulation of the proto-oncogenes and DNA synthesis in VSMCs. These data show that [Mg2+]o may be an important, heretofore, overlooked natural modulator of proto-oncogene and NF-kappaB expression in VSMCs and that Ca2+ and PKC may play critical roles in induction of c-fos and c-jun in VSMCs induced by a decrease in [Mg2+]o. These results point to a role for low serum Mg2+ in potential development of hypertension, atherogenesis, vascular disease, and stroke.

american journal of hypertension

Expression of the nuclear factor-κB and proto-oncogenes c-Fos and c-Jun are induced by low extracellular mg2+ in aortic and cerebral vascular smooth muscle cells: possible links to hypertension, atherogenesis, and stroke