周细胞向肌成纤维细胞转变将 APOE4 与脑血管退变联系起来
A pericyte-to-myofibroblast transition links APOE4 to cerebrovascular degeneration
脑血管病变是阿尔茨海默病的重要但了解不足的特征，而最强的遗传风险因素载脂蛋白 E4（APOE4）与血管淀粉样沉积和纤维化相关。作者构建了人脑血管的单细胞转录组图谱，发现 APOE4 携带者中周细胞（包裹血管的细胞）显著减少，并出现一种同时表达收缩和细胞外基质基因的肌成纤维细胞样细胞群，在患者和小鼠脑组织中得到免疫染色证实。研究表明 APOE4 周细胞转变为分泌纤连蛋白的肌成纤维细胞，促进血管淀粉样物质蓄积；转化生长因子 β（TGF-β）信号升高是这一转变的驱动因素。抑制 TGF-β 可恢复周细胞覆盖，并使血管纤维化和淀粉样沉积降至 APOE3 水平，提示了可干预的机制靶点。
为什么推荐给您：揭示 APOE4 经周细胞转分化致脑血管退变的新机制，且 TGF-β 抑制可逆转，转化前景明确
不需要生物学背景，多打比方
正在获取全文并生成讲解（拿不到全文就依据摘要），大约需要 30–60 秒…
已等待 0 秒
这篇还没有动画
动画会把研究的流程、作用机制和关键结果一步一步演示出来，每一步都标明出自原文哪里。制作大约需要 30–60 秒。
摘要Abstract
Cerebrovascular disease is a major but poorly understood feature of Alzheimer's disease (AD). The strongest genetic AD risk factor, apolipoprotein E4 (APOE4), is associated with cerebrovascular degeneration, including vascular amyloid deposition and fibrosis. To uncover how APOE4 promotes cerebrovascular pathology, we assembled a single-cell transcriptomic atlas of human brain vasculature. In APOE4 carriers, pericyte abundance was significantly reduced and accompanied by the emergence of a myofibroblast-like cell population co-expressing contraction and extracellular matrix genes. Immunostaining confirmed non-vascular myofibroblasts in APOE4 human and mouse brains. We show that APOE4 pericytes transition into myofibroblasts that secrete fibronectin, which promotes vascular amyloid accumulation. Computational and experimental analyses identified elevated transforming growth factor β (TGF-β) signaling as the driver of this pericyte-to-myofibroblast transition. Inhibition of TGF-β restored pericyte coverage and reduced vascular fibrosis and amyloid to APOE3 levels, revealing a targetable mechanism linking APOE4 to cerebrovascular pathology in AD.