在炎症微环境下,PGC-1α/LDHA信号促进了糖解的启动,以调节机械诱导的骨重塑
Jiani Liu1, Jixiao Wang1, Ziyao Wang1
1Department of Orthodontics, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University & Shandong Key Laboratory of Oral Tissue Regeneration & Shandong Engineering Research Center of Dental Materials and Oral Tissue Regeneration & Shandong Provincial Clinical Research Center for Oral Diseases, Jinan 250012, Shandong, China.
Bone
|May 24, 2024
概括
炎症通过改变细胞代谢来破坏机械力下的骨重塑. 通过PGC-1α和LDHA调节的增强糖解,可以抵消氧化酸化对骨修复的负面影响.
科学领域:
- 生物医学工程 生物医学工程
- 细胞机械生物学 细胞机械生物学
- 骨生物学 骨生物学
背景情况:
- 炎症的机械敏感性会影响细胞机械传导,但机制尚不清楚.
- 在机械力下了解炎症的代谢效应对于组织重塑至关重要.
- 目前的知识差距阻碍了对机械诱导的骨疾病的有效治疗策略.
研究的目的:
- 为了研究底层的代谢机制的炎症对机械力下骨头重塑的影响.
- 阐明氧化酸化 (OXPHOS) 和糖解在这个过程中的作用.
- 确定关键的分子调节器,如PGC-1α和LDHA,参与炎症期间的机械转导.
主要方法:
- 在炎症的背景下利用机械力模型.
- 使用GNE-140和Visomitin操纵代谢途径.
- 评估细胞反应,包括骨质生成和骨质细胞生成.
- 通过敲击和过度表达研究了氧酶增殖器激活受体马协激活剂1-α (PGC-1α) 的作用.
- 研究了乳酸脱酶A (LDHA) 的调节及其与PGC-1α的相互作用.
- 分析了细胞外pH值和蛋白质与蛋白质相互作用.
主要成果:
- 炎症阻碍了机械力下的骨重塑,增加了OXPHOS和糖解.
- 增强的葡萄糖分解似乎是补偿性的,促进了骨质生成,而不是OXPHOS诱导的骨质结晶形成.
- 减少PGC-1α表达损害了骨质生成,并通过OXPHOS增强了骨质结晶生成.
- 过度表达PGC-1α促进了糖解,减轻了炎症引起的骨重塑障碍.
- PGC-1α调节了LDHA活性和细胞外酸度,与PGC-1α-LDHA结合增强了糖解.
- 抑制LDHA消除了PGC-1α介导的骨修复效应.
结论:
- 炎症调节葡萄糖代谢 (糖解与OXPHOS),以影响机械诱导的骨重塑.
- PGC-1α在调节这种代谢开关方面发挥着关键作用,有利于骨质生成的葡萄糖分解.
- LDHA是PGC-1α的关键下游效应因子,在炎症机械环境中促进糖解和骨修复至关重要.
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