Department of Pharmacology and Clinical Pharmacology, Auckland, New Zealand; Centre for Brain Research, Auckland, New Zealand.
Centre for Brain Research, Auckland, New Zealand; Auckland City Hospital, Auckland, New Zealand.
J Chem Neuroanat. 2018 Oct;92:48-60. doi: 10.1016/j.jchemneu.2018.06.001. Epub 2018 Jun 7.
Brain pericytes and vascular smooth muscle cells (vSMCs) are a critical component of the neurovascular unit and are important in regulating cerebral blood flow and blood-brain barrier integrity. Identification of subtypes of mural cells in tissue and in vitro is important to any study of their function, therefore we identified distinct mural cell morphologies in neurologically normal post-mortem human brain. Further, the distribution of mural cell markers platelet-derived growth factor receptor-β (PDGFRβ), α-smooth muscle actin (αSMA), CD13, neural/glial antigen-2 (NG2), CD146 and desmin was examined. We determined that PDGFRβ, NG2, CD13, and CD146 were expressed in capillary-associated pericytes. NG2, and CD13 were also present on vSMCs in large vessels, however abundant CD146 and desmin staining was also detected in vSMCs on large vessels, co-labelling with αSMA. To determine whether cultures recapitulated observations from tissue, primary human brain pericytes derived from neurologically normal autopsies were analysed for the presence of pericyte markers by immunocytochemistry, western blotting and qPCR. The proteins observed in brain pericytes in tissue (PDGFRβ, αSMA, desmin, CD146, CD13, and NG2) were present in vitro, validating a panel of proteins that can be used to label brain pericytes and vSMCs in tissue and in vitro. Finally, we showed that the proteins CD146 and desmin that are expressed on large vessels in situ, are also selective markers of a smooth muscle cell phenotype in vitro.
脑周细胞和血管平滑肌细胞(vSMCs)是神经血管单元的关键组成部分,对于调节脑血流和血脑屏障完整性非常重要。在组织和体外鉴定壁细胞的亚型对于其功能的任何研究都很重要,因此我们在神经正常的尸检人脑组织中鉴定出了不同的壁细胞形态。此外,还检查了壁细胞标志物血小板衍生生长因子受体-β(PDGFRβ)、α-平滑肌肌动蛋白(αSMA)、CD13、神经胶质抗原-2(NG2)、CD146 和结蛋白的分布。我们确定 PDGFRβ、NG2、CD13 和 CD146 在毛细血管相关周细胞中表达。NG2 和 CD13 也存在于大血管中的 vSMCs 上,但是在大血管中的 vSMCs 上也检测到丰富的 CD146 和结蛋白染色,与αSMA 共标记。为了确定培养物是否再现了组织中的观察结果,通过免疫细胞化学、Western blot 和 qPCR 分析了从神经正常尸检中获得的原代人脑周细胞中周细胞标志物的存在情况。在组织中观察到的脑周细胞中的蛋白质(PDGFRβ、αSMA、结蛋白、CD146、CD13 和 NG2)在体外存在,验证了一组可用于标记组织和体外脑周细胞和 vSMCs 的蛋白质。最后,我们表明,原位大血管中表达的蛋白质 CD146 和结蛋白也是体外平滑肌细胞表型的选择性标志物。
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