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新型 p38 丝裂原活化蛋白激酶抑制剂可逆转缺氧诱导的大鼠肺动脉高压

2022-07-30 刘少飞 MedSci原创

本工作研究了LASSBio-1824在缺氧+SU5416诱导的(SuHx)PH大鼠心肺系统结构和功能的病理生理变化中的药理作用。

肺动脉高压 (PH) 是一种临床病症,其中观察到肺血管重塑和阻塞,最终导致肺动脉阻力和压力显着升高。它影响着全世界大约 10% 的老年人口,每年每百万人中有 3-10 例新病例被诊断出来,主要是年轻女性。如果不使用适当的治疗,预计平均生存期为 2.8 年,即使考虑到治疗的最新进展,诊断 5 年后生存率仍仅为 61%。

丝裂原活化蛋白激酶 (MAPK) 通过调节细胞增殖、分化、存活和组织炎症触发多种疾病的病理生理机制。p38 的抑制在 PH 和 RV 衰竭的动物模型中显示出有益效果。p38 的激活与炎症介质的产生有关,例如肿瘤坏死因子 (TNF)-α 和诱导型一氧化氮合酶 (iNOS)。此外,p38 还调节半胱天冬酶介导的细胞凋亡,这是 PH 期间参与血管重塑的重要条件。此外,该 MAPK还证明了在 RV 肥大和压力过载反应功能障碍中的独立作用。因此,心肺系统中的 p38 抑制可以直接在 RV 和肺中促进有益作用,并具有轻微的全身副作用。

最近,报道了 ( E ) -N '-(4-(pyridin-2-yl)benzylidene)-2-naphthohydrazide (LASSBio-1824,图 1 ) 的合成。这种新的N-酰基腙衍生物在体外生化试验中抑制 p38,并在小鼠口服给药后在体内显示出抗炎活性。基于此,本工作研究了LASSBio-1824在缺氧+SU5416诱导的(SuHx)PH大鼠心肺系统结构和功能的病理生理变化中的药理作用。

 

制药 15 00900 g001 550

图 1. LASSBio-1824 的分子结构

丝裂原活化蛋白激酶 (MAPK) 信号传导与肺动脉高压 (PH) 和右心室 (RV) 衰竭的心血管重塑密切相关。在实验诱导的 PH 中研究了新设计的 p38 抑制剂 LASSBio-1824 的作用。雄性 Wistar 大鼠暴露于缺氧和 SU5416 (SuHx) 环境中,并使用常氧大鼠作为对照。

 

图 2. 模型诱导、治疗方案和测量计划

使用载体或 LASSBio-1824 (50 mg/kg) 进行 14 天的口服治疗。通过超声心动图和导管插入术评估肺血管阻力和右室结构和功能。对肺和 RV 进行组织学、免疫组织化学和蛋白质印迹分析,以研究心血管重塑和炎症。LASSBio-1824 治疗通过减轻血管肌化和内皮功能障碍使血管阻力正常化。在心脏,治疗降低了 RV 收缩压、肥大和胶原蛋白含量,改善了心脏功能。治疗后肺血管和右室组织中 TNF-α、iNOS、磷酸化 p38 和 caspase-3 的蛋白质含量降低,并且在治疗的 SuHx 大鼠的心肌细胞中发现转录因子 c-fos 的激活降低。因此,LASSBio-1824 代表了重塑靶向治疗 PH 的潜在候选药物。

研究结论:

这项工作的新颖之处在于证明了一种新型口服活性 p38 抑制剂对慢性缺氧加 SU5416 诱导的 PH 大鼠的有益作用。在 14 天内用 LASSBio-1824 口服治疗可降低 PH 特征,包括肺动脉中血流和内皮功能的改变以及肺血管和 RV 中的组织重塑。LASSBio-1824 对 p38 的抑制作用通过降低 TNF-α 和 iNOS 的表达来减轻组织炎症,并通过抑制 c-fos 和 caspase-3 的激活来防止 RV 组织对应激的细胞凋亡。LASSBio-1824 促进的作用有助于肺和 RV 修复,这加强了将 p38 MAPK 作为治疗 PH 的有希望的靶点的重要性

 

参考文献:

Silva GF, da Silva JS, de Alencar AKN, de Moraes Carvalho da Silva M, Montagnoli TL, de Souza Rocha B, de Freitas RHCN, Sudo RT, Fraga CAM, Zapata-Sudo G. Novel p38 Mitogen-Activated Protein Kinase Inhibitor Reverses Hypoxia-Induced Pulmonary Arterial Hypertension in Rats. Pharmaceuticals (Basel). 2022 Jul 21;15(7):900. doi: 10.3390/ph15070900. PMID: 35890198.

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    2022-10-24 jklm09
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    2022-07-31 redcrab

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在这项研究中,我们评估了 DECTPA 参数与超声心动图衍生的 SPAP 的相关性,并使用新的基于患者的图像采集协议将这些参数的预测能力与 PH 和右心应变的常规 CTPA 征象进行了比较。

Transgelin 先天性心脏病相关的肺动脉高压患者的肺动脉平滑肌细胞功能障碍

Transgelin 是一种肌动蛋白结合蛋白,可调节肺动脉平滑肌细胞 (PASMC) 功能障碍。本研究旨在探讨transgelin在CHD-PAH发病机制中的分子机制和生物学功能。

AJRCCM:Y染色体基因Uty通过减少促炎症化合因子保护肺动脉高压

根据以前发现,Y染色体对缺氧诱导的实验性肺动脉高压(PH)有保护作用,这可能有助于PAH的性别差异。在此,我们确定了Y染色体的保护基因,研究了关键的下游常染色体基因,并展示了一种新的临床前疗法。

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