HDAC3通过调控巨噬细胞M1/M2极化平衡加重主动脉夹层损伤
罗国庆 , 谢孝平 , 江万里 , 王志维
武汉大学学报(医学版) ›› 2026, Vol. 47 ›› Issue (3) : 297 -305.
HDAC3通过调控巨噬细胞M1/M2极化平衡加重主动脉夹层损伤
HDAC3 exacerbates aortic dissection by disrupting macrophage M1/M2 polarization balance
目的 探讨组蛋白去乙酰化酶3(HDAC3)在主动脉夹层(AD)中的作用及其分子机制。 方法 收集主动脉夹层临床标本,用于病理染色及分子生物学实验。构建巨噬细胞特异性HDAC3敲除小鼠(HDAC3flox/flox-Lyz2-CreERT2+)及对照小鼠(HDAC3flox/flox)。采用β-氨基丙腈(BAPN)诱导AD模型。体外采用人单核细胞系THP-1,利用小干扰RNA(siRNA)敲低HDAC3,脂多糖(LPS)诱导M1型极化。通过组织病理学染色(HE,EVG)、ELISA、Western Blot、RT-qPCR、免疫荧光染色检测评估组织损伤、炎症水平、相关蛋白和mRNA表达。 结果 AD患者及小鼠模型主动脉组织中HDAC3表达显著升高,且与组织损伤程度呈正相关;巨噬细胞特异性敲除HDAC3可显著减轻AD小鼠模型的主动脉损伤、弹力纤维断裂及炎症因子(IL-6,TNF-α)释放;HDAC3敲除抑制了AD模型中NF-κB通路(p-p65,p-IκBα)的激活;体外实验中,HDAC3敲低抑制了LPS诱导的巨噬细胞M1型极化(iNOS,CD86)及NF-κB活化,还部分恢复了M2型极化标志物(CD206,Arg1)的表达;此外,HDAC3敲低时使用TNF-α对NF-κB重新激活会逆转前述的改善现象。 结论 HDAC3通过激活NF-κB信号通路,促进巨噬细胞向M1型极化并抑制其向M2型极化,导致巨噬细胞功能失衡,进而加剧炎症反应和细胞外基质降解,最终加重主动脉夹层损伤。靶向巨噬细胞HDAC3或有望成为AD治疗新策略。
Objective To investigate the role and molecular mechanisms of histone deacetylase 3 (HDAC3) in aortic dissection (AD). Methods Clinical AD specimens were collected for histopathological and the mouse models of molecular analyses macrophage-specific HDAC3 knockout (HDAC3flox/flox-Lyz2-CreERT2+) and controls (HDAC3flox/flox) were established. AD was induced by β-aminopropionitrile (BAPN) administration. In vitro, HDAC3 was knocked down by siRNA in THP-1 monocytes followed by lipopolysaccharide (LPS)-induced M1 polarization. Assessments included: histopathology (HE, EVG staining), ELISA, Western Blot, RT-qPCR, and immunofluorescence. Results HDAC3 was significantly upregulated in human and murine AD tissues, positively correlating with tissue damage severity. Macrophage-specific HDAC3 knockout attenuated aortic wall injury and elastic fiber fragmentation and reduced IL-6 and TNF-α release. HDAC3 deletion suppressed NF-κB pathway activation (p-p65 and p-IκBα). In vitro experiments demonstrated that HDAC3 knockdown suppressed LPS-induced M1 polarization (iNOS and CD86) and NF-κB activation in macrophages, while partially restoring expression of M2 polarization markers (CD206 and Arg1). Furthermore, reactivation of NF-κB via TNF-α treatment during HDAC3 knockdown reversed the aforementioned improvements. Conclusion HDAC3 exacerbates AD by activating the NF-κB pathway, which drives macrophage polarization imbalance (promoting M1 while suppressing M2 phenotypes). This imbalance amplifies inflammation and extracellular matrix degradation, ultimately accelerating aortic injury. Targeting macrophage HDAC3 may represent a novel therapeutic strategy for AD.
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国家自然科学基金项目(82070481)
湖北省重点研发计划项目(2022BCA035)
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