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Effect of docosahexaenoic acid on smooth muscle cell functions.

机译:二十二碳六烯酸对平滑肌细胞功能的影响。

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There is increasing evidence that fish oil-enriched diets attenuate the progression of several types of human and experimental renal, intestinal and cardiovascular disorders, including hypertension. Docosahexaenoic acid (DHA), may be one of the active biological component. We previously reported that dietary DHA suppressed the progression of hypertension in stroke-prone spontaneously hypertensive rats (SHRSP). The purpose of this study is to clarify the in vitro effect of DHA on cultured smooth muscle cell functions such as cell growth, hypertrophy, NO release, and intracellular Ca2+ metabolism, which are involved in the regulatory mechanisms of vascular tone. Addition of DHA to the culture medium of aortic smooth muscle cells isolated from SHRSP and normotensive Wistar Kyoto rats (WKY) had no significant effects on cell growth or on cell hypertrophy induced by angiotensin II as measured by flow cytometry. DHA had no stimulatory effect on interleukin-1beta (10 ng/ml)-induced nitric oxide release from smooth muscle cells of SHRSP, but rather slightly inhibited it. However, the treatment of smooth muscle cells with DHA (30 microM) for 2 days significantly suppressed the increase in intracellular Ca2+ concentration induced by angiotensin II, but not by thapsigargin. This was due to the suppression of Ca2+ influx, as determined by Mn2+ influx experiment. These results indicate that DHA specifically suppresses Ca2+ mobilization into smooth muscle cells. This may be one of the mechanisms by which dietary DHA prevents the development of hypertension in SHRSP.
机译:越来越多的证据表明,富含鱼油的饮食会减弱几种类型的人类和实验性肾脏,肠道和心血管疾病,包括高血压。二十二碳六烯酸(DHA)可能是活性生物成分之一。我们以前曾报道过饮食中的DHA可抑制易发中风的自发性高血压大鼠(SHRSP)的高血压发展。这项研究的目的是阐明DHA对培养的平滑肌细胞功能(如细胞生长,肥大,NO释放和细胞内Ca2 +代谢)的体外作用,这些作用均参与了血管紧张度的调节机制。通过流式细胞术测定,将DHA添加到从SHRSP和血压正常的Wistar Kyoto大鼠(WKY)分离的主动脉平滑肌细胞的培养基中对血管紧张素II诱导的细胞生长或肥大无明显影响。 DHA对白细胞介素1β(10 ng / ml)诱导的SHRSP平滑肌细胞释放一氧化氮没有刺激作用,但对其有轻微抑制作用。但是,用DHA(30 microM)处理平滑肌细胞2天可显着抑制血管紧张素II诱导的细胞内Ca2 +浓度增加,但毒胡萝卜素则不然。这是由于通过Mn2 +流入实验确定了对Ca2 +流入的抑制。这些结果表明,DHA特异性抑制Ca2 +动员进入平滑肌细胞。这可能是膳食DHA预防SHRSP高血压发展的机制之一。

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