Reduced expression of FXYD domain containing ion transport regulator 5 (FXYD5) in association with hypertension. (12th October 2011)

• Record Type: Journal Article
• Authors: Xiaoyan, Huang; Xaingxiang, Shi; Jian, Hong; Xi, Zhou; Yong-jian, Geng
• Is Part Of: Heart. Volume 97(2011)Supplement 3
• Page Start: A48
• Page End: A48
• Publication Date: 2011-10-12
• Subjects: Heart -- Diseases -- Treatment -- Periodicals; Cardiology -- Periodicals; 616.12
• DOI: 10.1136/heartjnl-2011-300867.137
• Languages: English
• ISSNs: 1355-6037

Abstract

Abstract : Background: To investigate the expression of hypertension-related genes in spontaneous hypertension. Methods: A microarray screening for hypertension-related genes was conducted in rats with spontaneous hypertension (SHR) and rats with normotensive Wistar-Kyoto (WKY) using total RNA extracted from second-order mesenteric arteries and kidneys. Then the FXYD5 mRNA expression in vascular smooth muscle cells (VSMCs) was silenced by RNA interference (RNAi). Furthermore, the proliferation, mobility and Na+-K+-ATPase activity of cell were analysed. Results: Among 10, 000 genes examined, the expression of human gene homolog FXYD domain containing ion transport regulator 5 (FXYD5) was found 14.8-fold lower in SHR than that in WKY rats (p<0.01). The result of microarray assay was confirmed using quantitative real-time RT-PCR and Northern Blot. The altered FXYD5 gene expression occurred in a time- and tissue-dependent manner. The FXYD5 gene expression was highest in SHR's kidney at age of 13 weeks when the blood pressure reached the highest levels. The down-regulated FXYD5 inhibits the migration of smooth muscle cells (p<0.01) and cell membrane Na+-K+-ATPase activity (p<0.01). Conclusions: The down-regulation of FXYD5 is related to the migration of smooth muscle cells and cell membrane Na+-K+-ATPase activity in rodents. So this gene may have profound impact on the regulation of blood pressure, and therefore is likely to act as a potential target for anti-hypertensive therapy.