Genomic effect of vitamin 'C' and statins within human mononuclear cells involved in atherogenic process

Abstract

Deregulated crosstalk within nuclear receptor/transcription factor family, comprising of peroxisome proliferator-activated receptors (PPARs) and liver X receptor-alpha (LXR-alpha), can give rise to cooperativity between lipid peroxidation and inflammation leading to atherogenic process. The present study addressed to explore the effect of statins and vitamin 'C' on transcriptional expression of genes coding for this nuclear receptor/transcription factor family within mononuclear cells revealed for the first time that both mevastatin and vitamin 'C' have common action in that they significantly downregulate the expression of PPARs (alpha, gamma) genes and upregulate LXR-alpha gene expression as compared to the control. The similar phenomenon was observed in mononuclear cells obtained from coronary heart disease (CHD) patients who were receiving atorvastatin treatment (20 mg HS). Further, the observed upregulatory effect of LXR-alpha gene expression was in conformity with the downregulatory effect of LXR-alpha on its effector gene matrix metalloproteinase-9. Based on these results, we propose that LXR-alpha-dependent signaling pathway may be a crucial target for the therapeutic intervention in human CHD, and in addition to statins, vitamin 'C' deserves a close scrutiny for the treatment of CHD.