Vitamin D Essay

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Vitamin D deficiency has become a key factor in predicting cardiovascular risk factors such as metabolic syndrome, diabetes mellitus, hypertension, and obesity. It is also a predictive factor of inflammation and fibrosis. All the key elements required for vitamin D function and metabolism e.g. vitamin D receptor and the two enzymes 1-alpha-hydroxylase and 24-hydroxylase are also present in the heart. Vitamin D could be involved in the pathogenesis of cardiovascular disease by exerting regulatory roles in vascular inflammation, proliferation and calcification, renin-angiotensin aldosterone system, myocardial fibrosis and cardiomyocyte proliferation. The effect of the sunshine vitamin on myocytes could reinforce its role as an important preventive or therapeutic agent. Results of studies indicate that vitamin D can improve myocytes differentiation alongside with decreasing cell proliferation which is one of the main elements contributing to plaque formation.
Another pathway involved in both morbidity and mortality of cardiovascular disease is fibrosis. Collagen isoforms ( as biomarkers of fibrosis) are reduced in mesenchymal cells after confronting with vitamin D. Moreover, presence of vitamin D can induce antifibrotic agents.
Arterial calcification (categorized into intimal and medial calcification) is another complication causing cardiovascular disease. Due to anti-inflammatory effects of vitamin D , it can inhibit various aspects of intimal and medial calcification. There are several factors influencing the process of(please write the whole of abbreviation here) VSMC calcification; core binding alpha-I (cbfaI) which turns a mesenchyme cell into an osteoblast, bone morphogenetic protein-2 (BMP-2 ) which accelerates the calcific...

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...survivors of myocardial infarction, number of damaged arteries is correlated with vitamin D binding protein. Vitamin D deficiency is correlated with high prevalence of double or triple vessel CAD and lower brachial artery flow-mediated dilations. Animal studies, including two studies conducted on atherosclerotic monkeys support the reverse association between concentrations of VDRA with plaque size and thickness. This association was not observed in monkeys with low VDR and high 25(OH)D3.
A number of studies were unable to approve the role of vitamin D on atherosclerosis, CAD or IHD. The Multi-Ethnic study of Atherosclerosis after adjusting for cardiovascular risk factors, vitamin D status did not significantly affect arterial stiffness but PTH>65 pg/ml was associated with arterial stiffness. This association was not significant after adjustment for blood pressure.

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