过酶增殖器激活受体α是由血管素转化酶诱导的巨细胞增强免疫功能的重要因素
Suguru Saito1, Duo-Yao Cao1, Ellen A Bernstein1
1Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA, USA.
Cellular & molecular immunology
|February 5, 2025
概括
过氧体增殖器激活受体α (PPARα) 对于血管酶转化酶 (ACE) 驱动的巨细胞免疫功能至关重要. 在表达ACE的髓状细胞中抑制PPARα会损害抗瘤和抗菌免疫力,突出显示PPARα.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 代谢过程中的代谢.
背景情况:
- 在髓状细胞中增加血管酶转化酶 (ACE) 表达增强了抗瘤和抗菌免疫力.
- 由ACE诱导的免疫细胞激活与氧酶增殖器激活受体α (PPARα) 相关,PPARα是一种脂质代谢调节剂.
研究的目的:
- 研究PPARα在ACE介导的巨细胞免疫增强中的作用.
- 确定选择性抑制ACE表达性巨细胞中的PPARα对抗瘤和抗菌功能的影响.
主要方法:
- 使用Cre-LoxP和LysM-Cre生成一个修饰的小鼠线 (A10-PPARα-Cre),以抑制ACE表达巨细胞中的PPARα.
- 在生成的小鼠模型中评估瘤生长 (B16-F10) 和对甲素耐药黄金葡萄球菌 (MRSA) 感染的耐药性.
- 使用增强ACE (THP-1-ACE) 的THP-1人类巨模型并执行PPARα的RNA沉默.
- 向野生型,A10-PPARα-Cre和ACE10/10小鼠注射了PPARα激动剂佩马菲布拉特.
主要成果:
- 与ACE10/10小鼠相比,A10-PPARα-Cre小鼠表现出瘤生长的增加和对MRSA感染的抗性降低.
- 在表达ACE的巨细胞中,PPARα的减少损害了细胞因子的产生,抗原的呈现和CD8+T细胞的产生.
- THP-1-ACE细胞表现出增强的细胞毒性和细菌清除,这些在PPARα沉默后减少.
- 在所有测试组中,膜纤维酸治疗减少了瘤生长,在ACE10/10小鼠中观察到的最显著的减少.
结论:
- PPARα对于增强ACE表达性髓状细胞的免疫功能至关重要.
- 依赖于ACE的巨细胞激活以及随后的抗瘤和抗菌免疫依赖PPARα.
- 向PPARα代表了一个潜在的治疗策略,用于调节髓状细胞中的免疫反应.
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