慢性肺静脉高压猪模型中肺静脉和动脉的组织学和蛋白质组学重塑

2022-01-24 刘少飞 MedSci原创

肺静脉高压 (PVH) 会产生肺动脉高压 (PH),并伴有肺静脉 (PV) 和动脉 (PA) 的重塑。在猪PVH模型中,本研究进行了基于蛋白质组学的生物信息学分析,以分析PA和PV重塑的病理生理机制。

在心力衰竭 (HF) 中,肺静脉高压 (PVH) 会产生肺动脉高压 (PH),并伴有肺静脉 (PV) 和动脉 (PA) 的重塑。在猪 PVH 模型中,我们进行了基于蛋白质组学的生物信息学研究,以研究介导 PA 和 PV 重塑的独特病理生理机制。

研究方法:

在仔猪中,大 PV 被带状(PVH,n = 10)或不带状(Sham,n = 9)。在处死时,针对血管特异性组织学和蛋白质组学对 PV 和 PA 进行灌注标记。PA 和 PV 分别用激光捕获显微切割进行质谱分析。

研究结果:

肺血管阻力(Wood单位;8.6对 2.0)和 PA(19.9 对 10.3 )和 PV(14.2  与 7.6) PVH 的壁厚/外径 (%) 增加(所有 p < 0.05)。在 PA (2093) 和 PV (2085) 中鉴定出相似数量的蛋白质,重叠率为 94%,但生物学过程不同。与 PA 相比,PV 中有更多的差异表达蛋白质(287 对 161)、改变的经典途径(17 对 3)和预测的上游调节因子(PUSR;22 对 6)。在 PA 和 PV 中,生物信息学表明综合应激反应和 mTOR 信号传导的激活与生长失调。在光伏领域,Rho/Rho 激酶信号也被激活,肌动蛋白细胞骨架信号减少,紧密连接和粘附连接、肝配蛋白 B 和小窝介导的内吞信号改变;所有这些都表明内皮屏障功能被破坏。事实上,蛋白质生物标志物和 PV 中的顶级 PUSR (TGF-β) 表明 PV 中存在内皮间质转化 (EndoMT)。人体尸检标本的结果相似。

研究结论:

在与心力衰竭 (HF) 相关的(第 2 组)PH 中,尽管肺静脉 (PV) 和动脉 (PA) 发生了重塑,但针对第 1 组 PH 中改变的 PA 生物学的疗法并未显示出一致的益处。在猪第 2 组 PH 模型中,显微解剖允许血管特异性(PV 和 PA)蛋白质组学/生物信息学。在 PA 和 PV 中,综合应激反应和 mTOR 信号传导被激活,有生长失调的证据。在 PV 中,随着内皮屏障功能破坏和内皮间充质转化的广泛证据,更多的途径发生了改变。研究结果在人体样本中得到证实,并为第 2 组 PH 的潜在治疗转化提供了新的靶点。

 

参考文献:

Fayyaz AU. Histologic and proteomic remodeling of the pulmonary veins and arteries in a porcine model of chronic pulmonary venous hypertension. Cardiovasc Res. 2022 Jan 12:cvac005. doi: 10.1093/cvr/cvac005. Epub ahead of print. PMID: 35022664.

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    2022-08-31 fusion
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    2022-01-21 muzishouyi

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