Dig Dis Sci:支链短链脂肪酸异戊酸通过cAMP / PKA途径可引起结肠平滑肌松弛

2019-06-10 不详 MedSci原创

异戊酸(IVA)是存在于发酵食品中的5-碳支链脂肪酸,也可以通过亮氨酸的细菌发酵在结肠中产生。以前有文献曾报道,较短的直链脂肪酸乙酸酯,丙酸酯和丁酸酯会对结肠运动产生不同的影响; 然而,支链脂肪酸对肠道平滑肌和运动的影响尚不清楚。因此,本项研究旨在探究支链短链脂肪酸与结肠运动的关系。

背景
异戊酸(IVA)是存在于发酵食品中的5-碳支链脂肪酸,也可以通过亮氨酸的细菌发酵在结肠中产生。以前有文献曾报道,较短的直链脂肪酸乙酸酯,丙酸酯和丁酸酯会对结肠运动产生不同的影响; 然而,支链脂肪酸对肠道平滑肌和运动的影响尚不清楚。因此,本项研究旨在探究支链短链脂肪酸与结肠运动的关系。

方法
研究人员将小鼠结肠区段纵向放置在Krebs缓冲液中并固定到传感器上。用乙酰胆碱(ACh)刺激肠段收缩,同时使用河豚毒素(TTx)或一氧化氮合酶[LN-硝基精氨酸(L-NNA)]或腺苷酸环化酶抑制剂等干扰因素测量IVA对ACh诱导的收缩的影响。 在存在或不存在SQ22536或蛋白激酶A(PKA)抑制剂(H-89)的情况下,测量IVA对ACh诱导的收缩的影响。

结果
研究结果显示在小鼠结肠段中,IVA以浓度依赖性方式抑制ACh诱导的收缩; IVA反应不受TTx或L-NNA影响,但受SQ22536抑制。在分离的结肠肌细胞中,ACH诱导的收缩被IVA以浓度依赖性方式抑制,并且该作用被SQ22536和H-89阻断。IVA还增加了分离的平滑肌细胞中的PKA活性。

结论
支链脂肪酸IVA直接作用于结肠平滑肌,并通过PKA途径引起肌肉松弛。

原始出处:

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    2019-12-01 whmdzju
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