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A&R:造血PAD4在关节炎中的重要作用:胶原和粒细胞集落刺激因子诱导的C57BL/6小鼠关节炎模型

2022-07-13 MedSci原创 MedSci原创

该研究团队成功开发了一种适用于C57BL/6小鼠的关节炎模型。该模型具有与人类RA一致的一些特征,表明造血PAD4是关节炎发展的重要贡献者。

目的全基因组关联研究已将编码肽基精氨酸脱氨酶4 (PAD4)PADI4与类风湿性关节炎(RA)联系起来。PAD4促进中性粒细胞胞外陷阱(NET)的形成。本研究旨在调查PAD4的起源和NET形成在C57BL/6小鼠关节炎模型中的重要性。

方法为了在胶原诱导的关节炎(CIA)模型中有效使用C57BL/6小鼠,研究人员在第21天引入了连续4天的粒细胞集落刺激因子(G-CSF)与免疫增强剂。在模型中评估了整体Padi4缺陷(Padi4-/-)的小鼠和具有造血谱系特异性Padi4缺陷(Padi4Vav1Cre/+)的小鼠。

结果G-CSF显著增加了CIA的发病率和严重程度。G-CSF处理的小鼠血浆中的瓜氨酸组蛋白H3 (Cit-H3)水平升高,而溶剂处理的小鼠则未见此现象。免疫荧光显微镜显示Cit-H3 G-CSF处理的小鼠的滑膜组织中沉积。在G-CSF改进的CIA模型中,Padi4+/+小鼠相比,Padi4-/-小鼠出现较轻的关节炎,血清白细胞介素6和血浆Cit-H3水平较低,滑膜组织中Cit-H4水平较低,微计算机断层扫描显示的骨侵蚀较少。同样,Padi4fl/fl小鼠相比,Padi4Vav1Cre/+ 小鼠出现较轻的关节炎,并呈现与Padi4/小鼠相同的表型。

结论该研究团队成功开发了一种适用于C57BL/6小鼠的关节炎模型,该模型完全符合动物福利的高标准。观察到雄性小鼠的关节炎发病率> 90%和可检测到的NET标志物。该模型具有与人类RA一致的一些特征,表明造血PAD4在关节炎发展中的重要作用,并且可能在未来的 RA 研究中证明是有用的。

出处:Fukui, S., Gutch, S., Fukui, S., Cherpokova, D., Aymonnier, K., Sheehy, C.E., Chu, L. and Wagner, D.D. (2022), The Prominent Role of Hematopoietic Peptidyl Arginine Deiminase 4 in Arthritis: Collagen- and Granulocyte Colony-Stimulating Factor–Induced Arthritis Model in C57BL/6 Mice. Arthritis Rheumatol, 74: 1139-1146. https://doi.org/10.1002/art.42093

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    2022-07-15 12286003m71暂无昵称

    学习

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    2022-07-14 xulv123

    认真学习~

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    2022-07-14 lmm397
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    2022-07-14 俅侠

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