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Circulation:前列腺素D2/DP1轴在老年性高血压病理过程中的作用!

2020-03-02 不详 MedSci原创

血压通常随着年龄的增长而升高,但其潜在机制仍未完全明确。随着年龄的增长,T淋巴细胞中促炎因子水平升高。前列腺素D2,可通过D-prostanoid受体1 (DP1)抑制1型T 辅助(Th1)细胞因子。在本研究中,研究人员对T细胞前列腺素D2/DP1轴在老年性高血压中的作用展开研究。为了阐明在衰老过程中,T细胞DP1的生理和病理作用,研究人员采集了年轻和老年男性受试者的外周血,并检测了CD4+ T细

血压通常随着年龄的增长而升高,但其潜在机制仍未完全明确。随着年龄的增长,T淋巴细胞中促炎因子水平升高。前列腺素D2,可通过D-prostanoid受体1 (DP1)抑制1型T 辅助(Th1)细胞因子。在本研究中,研究人员对T细胞前列腺素D2/DP1轴在老年性高血压中的作用展开研究。

为了阐明在衰老过程中,T细胞DP1的生理和病理作用,研究人员采集了年轻和老年男性受试者的外周血,并检测了CD4+ T细胞的基因表达和前列腺素产生。

年老人类和小鼠的CD4+ T细胞的前列腺素D2/DP1轴下调。耗竭CD4+T细胞的DP1可通过增加Th1细胞因子的分泌、血管重构、CD4+T细胞浸润及血管/肾脏中过氧化物的产生来进一步升高年老雄性小鼠的老年性高血压。相反,在T细胞中外源性表达DP1可通过建设Th1细胞因子的分泌来延缓小鼠的年龄相关性高血压。中和肿瘤坏死因子α或耗竭干扰素γ均可缓解CD4+T细胞DP1耗竭小鼠的老年性高血压。

机制上,DP1通过PKA/p-Sp1/NEDD4L通路介导的T-box-expressed-in-T-cells (T-bet)泛素化抑制Th1活性。在CD4+ T细胞中,敲除T-bet或强制NEDD4L表达可减轻CD4+T细胞特异性DP1缺陷小鼠的老年性高血压。在雄性小鼠中,通过BW245C激活DP1受体可预防年龄相关性血压升高,并可减少血管/肾脏过氧化物的产生。

前列腺素D2/DP1轴通过泛素化增加NEDD4L介导的T-bet降解来抑制与年龄相关的Th1激活和随后的高血压反应。T因此,T细胞DP1受体可能是老年性高血压的一个有吸引力的治疗靶点。

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