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Expression of α- and β-synucleins in cultured aStrocytes and the effects of inflammatory cytokines

机译:α-和β-乳突蛋白在培养的星形胶质细胞中的表达及炎症细胞因子的影响

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a- and β-Synucleins (aS and βS) are concentrated in presynaptic nerve terminals. as is now known to be a major component of Lewy bodies in Parkinson's diseaSe (PD) and dementia with Lewy bodies (DLB), as well as of oligodendroglial cytoplasmic inclusions in multiple system atrophy (MSA). Moreover, aS-positive inclusions in both astrocytic and oligodendroglial cells have also been detected in PD and DLB brains, However, these proteins have not been identified in glial cells in the normal human brain. We determined whether αS and βS might be expressed in glial cells. αS mRNA and protein were detected in normal human αStrocytes and U251 human αStrocytic glioma cells in vitro. Immunohistochemically, as immunoreactivity was found in the cytoplasm of astrocytes and oligodendrocytes in vibratome sections of brain tissue taken from normal human subjects. βS immunoreactivity was also found in the astrocytes but not in the oligodendrocytes. Interleukin-1 increased the level of αS mRNA and protein in U251 cells, on the other hand, interleukin-1 decreased the level of βS mRNA and protein. These findings suggest that αS-immunoreactive glial inclusions may be a consequence of altered protein structure rather than de novo expression of as and that a critical balance between as and βS might be involved in inflammatory processes. ?2003 Elsevier Science B.V. All rights reserved.
机译:A-和β-突发蛋白(AS和βS)浓缩在突触前神经末端。正如现在所知的那样成为帕金森病(PD)和具有Lewy体(DLB)的痴呆症的主要成分,以及多种系统萎缩(MSA)中的少突畸形细胞质夹杂物。此外,在Pd和DLB大脑中也检测到星形胶质细胞和少曲面细胞中的AS阳性夹杂物,然而,这些蛋白质尚未在正常人体脑中的胶质细胞中鉴定出这些蛋白质。我们确定αs和β是否可以在胶质细胞中表达。在体外,在正常人αsstrytes和U251人αsstrycytic胶质瘤细胞中检测αsmRNA和蛋白质。免疫组织化学上,作为从正常人类受试者占脑组织的致血管胶质细胞和少突胶质细胞的细胞质中发现的免疫反应性。在星形胶质细胞中也发现βS免疫反应性,但不在少偶突胶质细胞中发现。白细胞介素-1增加了U251细胞中αsmRNA和蛋白质的水平,另一方面,白细胞介素-1降低了βSmRNA和蛋白质的水平。这些发现表明αs-免疫反应性胶质夹杂物可能是改变蛋白质结构而不是Novo表达的结果,而AS和βS之间的临界平衡可能涉及炎症过程。 ?2003年elestvier science b.v.保留所有权利。

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