Diabetologia:1型糖尿病和NOD小鼠胰腺淋巴结间质细胞的表型会发生如何改变

2019-12-26 MedSci MedSci原创

我们的观察可能揭示了为什么抗cd20治疗人类1型糖尿病后c肽的丢失只是暂时延迟的原因。

当造血细胞(例如特定的树突状细胞亚群)和非造血细胞(例如淋巴结间质细胞[LNSC])向自身反应性T细胞呈递周围组织抗原时,两者均可介导淋巴结的耐受诱导。 LNSC通常调节T细胞的运输和存活,并通过发挥免疫抑制作用来帮助维持外周耐受。 然而,自身免疫是否可以与LNSC的致耐受性功能缺陷相关尚不清楚,并且缺乏关于人类LNSC特征的研究。本研究假设来自1糖尿病供体和NOD小鼠的胰腺淋巴结(PLNs)中的T细胞反应失调可能与LNSC功能改变有关。

研究人员使用流式细胞仪分析了来自1糖尿病供体和NOD小鼠的PLNsLNSC分布和表型。评估了来自人类供体的LNSCs不同亚群以及富含自身免疫调节剂(AIRE+细胞并鉴定为HLA-DRhigh CD45low的树突细胞群体中耐受性相关基因的表达。

研究发现,在1糖尿病NOD小鼠的两个供体中,不同LNSC亚群的相对频率均发生了改变,并且在1型人类糖尿病中,MHC II类和程序性死亡配体1PD-L1)表达均上调。 耐受性相关基因在稳定状态下的小鼠和人类LNSC之间显示相似的表达谱,但通常在人类1型糖尿病的情况下上调,而在富含AIRE的树突状细胞群体中许多此类基因出现下调。

研究显示,在1型糖尿病患者中,LNSCs发生了显著改变,但令人惊讶的是,它们表现出耐受表型增强,同时抗原呈递能力也增强了,这可能意味着试图弥补树突状细胞相关的耐受缺陷。因此,LNSCs可以作为另一种治疗靶点,发挥传递抗原作用帮助重建耐受性,从而用于预防或治疗1型糖尿病。

原始出处:

Jorge Postigo-FernandezDonna L. FarberPhenotypic alterations in pancreatic lymph node stromal cells from human donors with type 1 diabetes and NOD mice

本文系梅斯医学(MedSci)原创编译整理,转载需授权!

 

 

Diabetologia:在NOD小鼠抗cd20治疗后,表型明显的抗胰岛素B细胞在胰岛重新增殖

自身反应性B细胞逃避免疫耐受,是1型糖尿病的发病机制之一。虽然全球B细胞耗竭是一种成功的自体免疫性疾病的治疗方法,但在自体免疫性糖尿病的治疗过程中,自体反应细胞的命运仍是未知的。我们的目的是识别和跟踪胰岛中的抗胰岛素B细胞,并了解它们在抗cd20治疗后的再增殖情况。

我们产生了一个双重转基因系统,VH125hCD20 / NOD小鼠。将表达抗胰岛素B细胞频率增加的VH125转基因小鼠与人CD20 (hCD20)转基因小鼠杂交,以促进使用抗CD20B细胞耗竭。采用多参数流式细胞术和成像分析B细胞。

我们证明了抗胰岛素B细胞在VH125疾病进展过程中被招募到胰腺。老鼠hCD20 /点头。基于CD19的表达,我们在胰岛中发现了两个不同的抗胰岛素B细胞群,它们都富集于CD138int片段。血浆细胞CD138hi部分未检测到抗胰岛素B细胞,CD138hi部分也表达了转录因子Blimp-1。抗cd20治疗后,抗胰岛素B细胞比非特异性B细胞更早的在胰岛重新增殖。重要的是,我们观察到,在B细胞耗竭后,一个cd138胰岛素+CD19−群体特别丰富,这可能有助于抗cd20治疗后仍在一些小鼠中观察到的疾病的持续存在。

我们的观察可能揭示了为什么抗cd20治疗人类1型糖尿病后c肽的丢失只是暂时延迟的原因。

原始出处:

Joanne BoldisonLarissa C. Da RosaPhenotypically distinct anti-insulin B cells repopulate pancreatic islets after anti-CD20 treatment in NOD mice

本文系梅斯医学(MedSci)原创编译整理,转载需授权!


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    2019-12-28 sodoo
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    2019-12-28 tastas
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    2019-12-26 misszhang

    谢谢MedSci提供最新的资讯

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