Epigenetic regulation of somatic angiotensin-converting enzyme by DNA methylation and histone acetylation - PubMed (original) (raw)
doi: 10.4161/epi.6.4.14961. Epub 2011 Apr 1.
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- PMID: 21364323
- DOI: 10.4161/epi.6.4.14961
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Epigenetic regulation of somatic angiotensin-converting enzyme by DNA methylation and histone acetylation
Guillaume Rivière et al. Epigenetics. 2011 Apr.
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Abstract
Somatic angiotensin-converting enzyme (sACE) is crucial in cardiovascular homeostasis and displays a tissue-specific profile. Epigenetic patterns modulate genes expression and their alterations were implied in pathologies including hypertension. However, the influence of DNA methylation and chromatin condensation state on the expression of sACE is unknown. We examined whether such epigenetic mechanisms could participate in the control of sACE expression in vitro and in vivo. We identified two CpG islands in the human ace-1 gene 3 kb proximal promoter region. Their methylation abolished the luciferase activity of ace-1 promoter/reporter constructs transfected into human liver (HepG2), colon (HT29), microvascular endothelial (HMEC-1) and lung (SUT) cell lines (p < 0.001). Bisulphite sequencing revealed a cell-type specific basal methylation pattern of the ace-1 gene -1,466/+25 region. As assessed by RT-qPCR, inhibition of DNA methylation by 5-aza-2'-deoxycytidine and/or of histone deacetylation by trichostatin A highly stimulated sACE mRNA expression cell-type specifically (p < 0.001 vs. vehicle treated cells). In the rat, in vivo 5-aza-cytidine injections demethylated the ace-1 promoter and increased sACE mRNA expression in the lungs and liver (p = 0.05), but not in the kidney. In conclusion, the expression level of somatic ACE is modulated by CpG-methylation and histone deacetylases inhibition. The basal methylation pattern of the promoter of the ace-1 gene is cell-type specific and correlates to sACE transcription. DNMT inhibition is associated with altered methylation of the ace-1 promoter and a cell-type and tissue-specific increase of sACE mRNA levels. This study indicates a strong influence of epigenetic mechanisms on sACE expression.
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