酸盐激酶M2的代谢功能调节了活性氧物种的产生和中性粒细胞杀死微生物的功能
Juliana Escher Toller-Kawahisa1,2, Carlos Hiroji Hiroki3,4, Camila Meirelles de Souza Silva3,4
1Department of Pharmacology, Ribeirao Preto Medical School, University of Sao Paulo, Ribeirao Preto, Brazil. jutoller@hotmail.com.
酸盐激酶M2 (PKM2) 调节中性粒细胞的活性氧物种 (ROS) 生产和杀死细菌. 缺少PKM2会通过改变糖解,特别是二氧酸 (DHAP) 和二甲基甘油 (DAG) 合成来损害微生物的防御能力.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞代谢 细胞代谢
- 微生物学 微生物学
背景情况:
- 中性粒细胞利用糖解来执行重要功能,例如产生活性氧物种 (ROS).
- 酸盐激酶M2 (PKM2),一个关键的糖解酶,在中性粒细胞功能中的作用在很大程度上是未知的.
- 了解中性粒细胞代谢对于开发新的抗微生物策略至关重要.
研究的目的:
- 调查PKM2在中性粒细胞ROS产生和杀死微生物中的作用.
- 阐明中性粒细胞中PKM2调节的代谢途径.
- 评估PKM2缺乏对宿主防御细菌感染的体内影响.
主要方法:
- 在齐莫桑激活的中性粒细胞中研究了PKM2表达.
- 利用了中性粒细胞中PKM2的药理抑制和遗传缺陷.
- 在试验室中评估了ROS的产生和杀死金黄色葡萄球菌.
- 分析了糖溶性中间体 (PEP,DHAP) 和二甲酸甘油 (DAG) 的合成.
- 在体内评估宿主防御,使用老鼠模型对黄金葡萄球菌感染.
主要成果:
- 在活性中性粒细胞中,PKM2表达增加.
- 抑制或缺乏PKM2会减少中性粒细胞ROS的产生,并杀死黄金色细菌.
- 由于PKM2的缺陷导致了基酸 (PEP) 的积累,并降低了二氧酸 (DHAP) 的产量.
- 观察到从糖解中产生的二甲基甘油 (DAG) 的新生合成受损.
- 骨髓状细胞中的PKM2缺乏会影响体内细菌感染的控制.
结论:
- PKM2是ROS产生和杀死中性粒细胞中的微生物的关键调节者.
- 通过糖解,PKM2通过控制DHAP和DAG的合成来调节中性粒细胞的功能.
- 向PKM2可能为细菌感染提供一种新的治疗方法.
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