当前位置:首页>南昌>南昌大学江西医学院第一附属医院丨PLAC8:心肌梗死治疗新靶点,分子机制深度解析

南昌大学江西医学院第一附属医院丨PLAC8:心肌梗死治疗新靶点,分子机制深度解析

  • 2026-06-02 16:51:39
南昌大学江西医学院第一附属医院丨PLAC8:心肌梗死治疗新靶点,分子机制深度解析

文献学习

本研究先通过 GEO 数据库筛选发现心肌缺血组织中 PLAC8 显著下调,随后构建小鼠心肌梗死模型与缺氧诱导 H9C2 细胞模型,采用 qPCR、Western blot、染色及流式等方法验证 PLAC8 表达变化,再通过过表达 PLAC8 观察心肌损伤、凋亡、炎症及通路变化,并用 MEK 抑制剂 U0126 反向验证通路依赖性,最终证实心肌梗死与缺氧状态下 PLAC8 表达降低,会激活 MEK/ERK 与 NF‑κB/p65 通路,加剧心肌细胞凋亡、组织损伤及炎症反应,而过表达 PLAC8 可抑制上述通路激活,减轻心肌损伤、缩小梗死面积、降低凋亡与炎症水平,且该保护作用依赖 MEK/ERK 通路,提示 PLAC8 可作为心肌梗死潜在治疗靶点。

研究背景

心肌梗死由冠状动脉阻塞引发心肌缺血坏死,心肌细胞凋亡是核心病理过程,虽有再灌注治疗但死亡率仍居高不下,寻找抑制心肌细胞凋亡的靶点至关重要;PLAC8 参与器官发育与肿瘤发生,但其与心肌梗死的关联尚不明确;MEK/ERK 与 NF‑κB 通路过度激活会促进心肌纤维化、重构与炎症,是心肌梗死重要调控通路,本研究旨在探索 PLAC8 在心肌梗死中的作用及分子机制。

研究方案

先借助 GEO 数据库筛选心肌缺血差异表达基因锁定 PLAC8,再建立小鼠 LAD 结扎心肌梗死模型与缺氧 H9C2 细胞模型,检测 PLAC8 表达水平;通过病毒载体实现 PLAC8 过表达,评估心肌组织形态、梗死面积、细胞凋亡、心肌损伤标志物及炎症因子变化;检测 MEK/ERK、NF‑κB/p65 通路活化情况,最后用 MEK 抑制剂 U0126 验证 PLAC8 的保护作用是否依赖该通路。

研究结果

PLAC8 在心肌缺血组织与缺氧 H9C2 细胞中显著低表达;过表达 PLAC8 可改善小鼠心肌结构紊乱、减少炎性浸润、缩小心肌梗死面积、降低心肌细胞凋亡率,同时下调 ANP、BNP、cTnT、cTnI 等损伤标志物及 IL‑1β、TNF‑α 炎症因子,降低 Cle‑Casp3、BAX 凋亡蛋白水平;过表达 PLAC8 显著抑制 MEK/ERK 磷酸化与 NF‑κB/p65 核转位,而 U0126 可逆转 PLAC8 的上述保护效应。

Figure1:证实 PLAC8 在小鼠心肌梗死组织和缺氧诱导的 H9C2 细胞中,mRNA 与蛋白水平均显著下调。

Figure2:证明过表达 PLAC8 能改善心肌梗死小鼠的心肌结构损伤、减小梗死面积、减少细胞凋亡,并降低心肌损伤标志物与炎症因子水平。

Figure3:揭示过表达 PLAC8 可抑制心肌梗死小鼠心肌组织中 MEK/ERK 通路的磷酸化激活与 NF‑κB/p65 的核转位。

Figure4:验证过表达 PLAC8 能缓解缺氧对 H9C2 细胞的损伤、抑制凋亡,同时抑制 MEK/ERK 与 NF‑κB/p65 通路激活。

Figure5:确认 MEK 抑制剂 U0126 可完全逆转 PLAC8 过表达对缺氧 H9C2 细胞的抗凋亡与通路抑制作用,证实其保护效应依赖 MEK/ERK 通路。

研究结论

本研究明确 PLAC8 在心肌梗死中低表达,其通过抑制 MEK/ERK 及 NF‑κB/p65 通路减少心肌细胞凋亡、减轻炎症与组织损伤,是心肌梗死潜在治疗靶点,为临床诊疗提供新方向;但研究仅在小鼠与细胞水平开展,未进行人体样本验证,也未探究 PLAC8 上游调控机制,且未评估长期疗效与安全性,后续需开展临床研究与更深入的机制探索。

本文中使用的源Pubmed,因客观原因未能与权利人取得联系。本平台出于学术交流目的引用,无意侵犯原作者权益。如权利人认为不妥,请及时联系公众号后台,我们将立即删除或协商解决。

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  1. CONNECT:[ UseTime:0.000719s ] mysql:host=127.0.0.1;port=3306;dbname=aa460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000632s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.005005s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003603s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000937s ]
  6. SELECT * FROM `set` [ RunTime:0.005813s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000579s ]
  8. SELECT * FROM `article` WHERE `id` = 520853 LIMIT 1 [ RunTime:0.001235s ]
  9. UPDATE `article` SET `lasttime` = 1780494629 WHERE `id` = 520853 [ RunTime:0.008765s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.003510s ]
  11. SELECT * FROM `article` WHERE `id` < 520853 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001117s ]
  12. SELECT * FROM `article` WHERE `id` > 520853 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000445s ]
  13. SELECT * FROM `article` WHERE `id` < 520853 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.012937s ]
  14. SELECT * FROM `article` WHERE `id` < 520853 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002927s ]
  15. SELECT * FROM `article` WHERE `id` < 520853 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000816s ]
0.117744s