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可溶性肿瘤坏死因子的选择性抑制改变小鼠中度脊髓损伤后的神经炎症反应。

Selective Inhibition of Soluble Tumor Necrosis Factor Alters the Neuroinflammatory Response following Moderate Spinal Cord Injury in Mice.

作者信息

Lund Minna Christiansen, Ellman Ditte Gry, Nielsen Pernille Vinther, Raffaele Stefano, Fumagalli Marta, Guzman Raphael, Degn Matilda, Brambilla Roberta, Meyer Morten, Clausen Bettina Hjelm, Lambertsen Kate Lykke

机构信息

Department of Neurobiology Research, Institute of Molecular Medicine, University of Southern Denmark, 5000 Odense, Denmark.

Department of Neurology, Odense University Hospital, 5000 Odense, Denmark.

出版信息

Biology (Basel). 2023 Jun 12;12(6):845. doi: 10.3390/biology12060845.

Abstract

Clinical and animal model studies have implicated inflammation and glial and peripheral immune cell responses in the pathophysiology of spinal cord injury (SCI). A key player in the inflammatory response after SCI is the pleiotropic cytokine tumor necrosis factor (TNF), which exists both in both a transmembrane (tmTNF) and a soluble (solTNF) form. In the present study, we extend our previous findings of a therapeutic effect of topically blocking solTNF signaling after SCI for three consecutive days on lesion size and functional outcome to study the effect on spatio-temporal changes in the inflammatory response after SCI in mice treated with the selective solTNF inhibitor XPro1595 and compared to saline-treated mice. We found that despite comparable TNF and TNF receptor levels between XPro1595- and saline-treated mice, XPro1595 transiently decreased pro-inflammatory interleukin (IL)-1β and IL-6 levels and increased pro-regenerative IL-10 levels in the acute phase after SCI. This was complemented by a decrease in the number of infiltrated leukocytes (macrophages and neutrophils) in the lesioned area of the spinal cord and an increase in the number of microglia in the peri-lesion area 14 days after SCI, followed by a decrease in microglial activation in the peri-lesion area 21 days after SCI. This translated into increased myelin preservation and improved functional outcomes in XPro1595-treated mice 35 days after SCI. Collectively, our data suggest that selective targeting of solTNF time-dependently modulates the neuroinflammatory response by favoring a pro-regenerative environment in the lesioned spinal cord, leading to improved functional outcomes.

摘要

临床和动物模型研究表明,炎症以及神经胶质细胞和外周免疫细胞反应参与了脊髓损伤(SCI)的病理生理过程。SCI后炎症反应中的一个关键因素是多效性细胞因子肿瘤坏死因子(TNF),它以跨膜(tmTNF)和可溶性(solTNF)两种形式存在。在本研究中,我们扩展了之前的研究结果,即连续三天局部阻断SCI后solTNF信号传导对损伤大小和功能结局的治疗作用,以研究选择性solTNF抑制剂XPro1595治疗的小鼠与生理盐水治疗的小鼠相比,对SCI后炎症反应时空变化的影响。我们发现,尽管XPro1595治疗组和生理盐水治疗组小鼠的TNF和TNF受体水平相当,但XPro1595在SCI后的急性期可短暂降低促炎白细胞介素(IL)-1β和IL-6水平,并提高促再生IL-10水平。这伴随着脊髓损伤区域浸润白细胞(巨噬细胞和中性粒细胞)数量的减少以及SCI后14天损伤周围区域小胶质细胞数量的增加,随后在SCI后21天损伤周围区域小胶质细胞活化减少。这转化为XPro1595治疗的小鼠在SCI后35天髓磷脂保存增加和功能结局改善。总的来说,我们的数据表明,选择性靶向solTNF可通过在损伤的脊髓中营造促再生环境来时间依赖性地调节神经炎症反应,从而改善功能结局。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a69b/10295415/97696c15420d/biology-12-00845-g001.jpg

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