Circulation:减少支链氨基酸摄入可降低代谢综合征相关血栓形成风险

2020-07-16 MedSci原创 MedSci原创

支链氨基酸(BCAAs)是必需的营养素,包括亮氨酸、异亮氨酸和缬氨酸,可作为能量生成的原料以及重要营养素和代谢信号的调节剂。近期研究表明,BCAA分解代谢功能障碍与心血管疾病的风险有关。

支链氨基酸(BCAAs)是必需的营养素,包括亮氨酸、异亮氨酸和缬氨酸,可作为能量生成的原料以及重要营养素和代谢信号的调节剂。近期研究表明,BCAA分解代谢功能障碍与血管疾病的风险有关。血小板在心血管疾病中起重要作用,但血小板的BCAA分解代谢的功能仍然未知。

本研究检测了健康受试者摄入BCAA前后的血小板活性。蛋白磷酸酶2Cm特异性地使支链α-酮酸脱氢酶磷酸化,从而激活BCAA分解代谢。

结果显示摄入BCAA可以显著促进人体血小板活性和小鼠动脉血栓形成。缬氨酸分解代谢物α-酮异戊酸和最终氧化产物丙酰辅酶A对血小板活化表现出最强的促进作用,提示缬氨酸/α-酮异戊酸分解代谢途径在BCAA促进血小板活化中起主要作用。蛋白磷酸酶2Cm缺乏显著抑制了激动剂引起的血小板活性。

BCAA代谢途径还可能参与整合素αIIbβ3介导的调节血小板活化的双向信号传导途径。BCAAs增强了血小板tropomodulin-3 K255处的丙酰化。Tropomodulin-3 K255A突变可废除丙酰化,进而减弱了BCAAs对整合素介导的细胞扩散的促进作用,提示tropomodulin-3的K255丙酰化是整合素αIIbβ3介导的BCAA促进血小板活化和血栓形成的重要机制。在2型糖尿病患者来源的血小板中,BCAA水平升高和BCAA代谢的阳性调节因子的表达与血小板的强活性显著相关。减少BCAA摄入可明显减弱ob/ob小鼠的血小板活性。

BCAA分解代谢是血小板活化的重要调节剂,并与动脉血栓形成风险相关。靶向BCAA分解代谢途径或减少BCAA的摄入量可作为代谢综合征相关血栓形成的新治疗策略。

原始出处:

Yanyan Xu,et al. Branched-Chain Amino Acid Catabolism Promotes Thrombosis Risk by Enhancing Tropomodulin-3 Propionylation in Platelets. Circulation. 2020;142:49–64

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