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抑制NOS可以逆转TLR2诱导的软骨细胞功能障碍,并减轻与年龄相关的关节炎

Ping Shen^1,2,3, Sebastian Serve^1,2, Peihua Wu^1,2

¹Pitzer Laboratory of Osteoarthritis Research, German Rheumatism Research Center, a Leibniz Institute, 10117 Berlin, Germany.

Proceedings of the National Academy of Sciences of the United States of America

|July 10, 2023

概括

收费类受体2 (TLR2) 的激活会在人类软骨细胞中触发氧化合成酶2 (NOS2),导致骨关节炎 (OA) 的发展. 抑制NOS2可以保护OA,这表明了这种关节疾病的新治疗点.

科学领域:

生物化学生物化学
免疫学免疫学免疫学
整形外科整形外科整形外科

背景情况:

骨关节炎 (OA) 是一种退行性关节疾病,其特征是软骨破坏和疼痛.
精确的触发器和信号通路驱动OA病变,尽管与年龄和创伤有关,仍然不清楚.
由于软骨损伤而积累的碎片可以激活Toll-like受体 (TLRs),可能启动炎症反应.

研究的目的:

调查托尔类受体2 (TLR2) 在人类状细胞功能障碍和骨关节炎 (OA) 发展中的作用.
阐明涉及TLR2-介导的冠状细胞病理的信号通路.
基于这些途径,探索OA的潜在治疗点.

主要方法:

用TLR2激动剂刺激人类红细胞,以评估基因表达和线粒体功能的变化.
用RNA测序来分析TLR2刺激后的全球基因表达变化.
缺乏NOS2 (Nos2-/-) 的小鼠被用于评估NOS2在与年龄相关的OA中的体内作用.
用氧化合成酶 (NOS) 抑制来评估其对状细胞功能的影响.

主要成果:

TLR2刺激抑制了矩阵蛋白的表达,并诱导了人体红细胞中的炎症表型.
TLR2激活损害了状细胞的线粒体功能,显著减少了腺三酸盐 (ATP) 的产生.
RNA测序揭示了TLR2上调的氧化合成酶2 (NOS2) 和下调的线粒体相关基因.
NOS抑制部分恢复了基因表达,线粒体功能和ATP生产.
No2-/-小鼠表现出对与年龄相关的OA发展的保护.

结论:

TLR2-NOS轴促进人体冠状细胞功能障碍,并有助于小鼠OA的发展.
准TLR2-NOS通路为骨关节炎提供了潜在的治疗和预防策略.
了解这些分子机制对于开发有效的OA治疗至关重要.

关键词:

收费类受体的收费类受体.软骨 - - 具有合成和合成的活性.冠状腺细胞 (chondrocytes) 是一种体内细胞.氧化合成酶是一种氧化合成酶.骨关节炎是一种关节炎.

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