在突变的GRN和Grn缺陷的外围髓状细胞中,ASO介导的GPNMB的淘汰破坏了 lysosomal 功能和免疫反应
bioRxiv : the preprint server for biology
|August 30, 2024
概括
糖蛋白非转移性黑色素瘤蛋白B (GPNMB) 在progranulin缺乏症中的上调可能是补偿性的. 在FTD-GRN中准GPNMB可能会破坏免疫细胞功能,这表明它.
科学领域:
- 免疫学 免疫学 免疫学
- 神经科学是一个神经科学.
- 遗传学 遗传学 是一个
背景情况:
- 葡萄糖蛋白非转移性黑色素瘤蛋白B (GPNMB) 在FTD-GRN骨髓液和大脑中升高,在老年Grn缺乏小鼠中升高.
- 虽然年轻的GRN缺陷小鼠没有显示脑GPNMB增加,但它们的外围免疫细胞确实增加了,这表明它们的作用复杂.
- 对于progranulin缺乏症的GPNMB的功能意义尚不清楚,但它是一个潜在的治疗点.
研究的目的:
- 为了研究GPNMB在免疫细胞中的功能作用,在progranulin缺乏状态下.
- 评估GPNMB对免疫细胞功能的影响,包括溶酶体活性,抗原呈现和细胞因子分泌.
- 确定针对GPNMB是否是GRN介导的神经退行症的可行治疗策略.
主要方法:
- 在FTD-GRN患者和健康对照的单细胞中使用反感性寡核酸 (ASO) 评估了GPNMB的淘汰效应.
- 从GRN缺乏的小鼠和对照对溶酶体功能,抗原呈现和细胞因子释放进行了分析.
- 在小鼠巨细胞中IFNγ刺激后评估的转录变化和细胞因子分泌.
主要成果:
- 通过ASO介导的GPNMB knockdown增加了FTD-GRN和健康的对照单细胞中的溶酶体负担和细胞因子分泌.
- 在GRN缺乏的巨细胞中,GPNMB的淘汰减少了溶解体活性和蛋白质降解.
- 在雌性Grn缺陷巨细胞中,Knockdown增加了MHC-II表面表达,在小鼠巨细胞中失调了细胞因子分泌.
结论:
- GPNMB调节髓状细胞的免疫功能,可能通过其细胞外碎片 (ECF) 抑制炎症.
- 在progranulin缺乏症中,GPNMB升高可能是维持髓状细胞 lysosomal 功能的一种补偿机制.
- 在FTD-GRN中准GPNMB耗尽可能不是一个合理的治疗策略,因为潜在的免疫调节失调.
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