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Ann Rheum Dis:精氨酸酶II在骨关节炎发病机制中的关键作用

2019-01-05 xiangting MedSci原创

这项研究结果表明Arg-II是小鼠OA发病机制的关键调节因子。

骨关节炎(OA)似乎与各种代谢紊乱有关,但氨基酸代谢对OA发病机制的潜在影响尚未被明确阐述。这项研究探讨了软骨细胞氨基酸代谢的改变是否可以调节OA发病机制。

通过微阵列分析检测原代培养传代0小鼠软骨细胞中氨基酸代谢调节基因的表达谱,并在小鼠OA软骨细胞和人、小鼠模型的OA软骨中进一步表征所选基因。通过内侧半月板去稳定化(DMM)或关节内(IA)注射表达分解代谢调节剂的腺病毒诱导小鼠实验性OA。在Arg2-/- 小鼠和IA注射编码Arg-II腺病毒(Ad-Arg-II)的小鼠中检测精氨酸酶II(Arg-II)的功能结果。

在各种病理情况下及人类OA患者和各种小鼠模型的OA软骨中,软骨细胞中编码精氨酸代谢酶Arg-II的基因均特异性上调。小鼠关节组织中腺病毒介导的Arg-II过表达引起OA发病,而小鼠中Arg2的基因切除(Arg2-/-)消除了DMM诱导OA的所有表现。从机制上讲,Arg-II似乎至少部分通过核因子(NF)-κB途径上调软骨细胞中基质降解酶(基质金属蛋白酶3[MMP3]和MMP13)的表达而导致OA的软骨破坏。

这项研究结果表明Arg-II是小鼠OA发病机制的关键调节因子。虽然人类和小鼠的软骨细胞并不相同,但同样对Arg-II有反应,研究结果表明Arg-II可能是OA发病机制的治疗靶点。

原始出处:

Wan-Su Choi. Critical role for arginase II in osteoarthritis pathogenesis. Ann Rheum Dis. 04 January 2019.

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    2019-01-07 lmm397

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