Pattern recognition receptors (PRRs) are crucial for responses to infections and tissue damage; however, their role in autoimmunity is less clear. Herein we demonstrate that 2 C-type lectin receptors (CLRs) Mcl and Mincle play an important role in the pathogenesis of experimental autoimmune encephalomyelitis (EAE), an animal model of multiple sclerosis (MS). Congenic rats expressing lower levels of Mcl and Mincle on myeloid cells exhibited a drastic reduction in EAE incidence. In vivo silencing of Mcl and Mincle or blockade of their endogenous ligand SAP130 revealed that these receptors' expression in the central nervous system is crucial for T cell recruitment and reactivation into a pathogenic Th17/GM-CSF phenotype. Consistent with this, we uncovered MCL- and MINCLE-expressing cells in brain lesions of MS patients and we further found an upregulation of the MCL/MINCLE signaling pathway and an increased response following MCL/MINCLE stimulation in peripheral blood mononuclear cells from MS patients. Together, these data support a role for CLRs in autoimmunity and implicate the MCL/MINCLE pathway as a potential therapeutic target in MS.

译文

模式识别受体(PRRs)对于感染和组织损伤的反应至关重要。然而,它们在自身免疫中的作用尚不清楚。本文中,我们证明2 C型凝集素受体(CLR)Mcl和Mincle在实验性自身免疫性脑脊髓炎(EAE)(多发性硬化症(MS)的动物模型)的发病机理中起重要作用。在骨髓细胞上表达较低水平的Mcl和Mincle的同类大鼠表现出EAE发生率的大幅降低。 Mcl和Mincle的体内沉默或它们的内源性配体SAP130的沉默表明,这些受体在中枢神经系统中的表达对于T细胞募集和重新活化成致病性Th17 / GM-CSF表型至关重要。与此相一致,我们在MS患者的脑部病变中发现了表达MCL和MINCLE的细胞,我们还发现MCL / MINCLE信号通路的上调和MCL / MINCLE刺激后MS患者外周血单核细胞中的应答增加。总之,这些数据支持CLR在自身免疫中的作用,并暗示MCL / MINCLE途径是MS中潜在的治疗靶点。

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