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顶尖科学期刊《科学》发表的一项重磅单细胞研究揭示，人类海马体在50岁至75岁之间会经历一场前所未有的细胞与基因组重组。\n\n由纽约基因组中心科学主任任冰教授以及加州大学尔湾分校徐向民教授领衔的跨学科团队，利用先进的单细胞表观基因组学技术，精确绘制出了这一阶段大脑内部的微观变化图谱。 研究表明，海马体这一掌控学习与记忆的核心枢纽，在这个关键年龄段展现出了高度动态的改组特征。\n\n这一发现彻底打破了科学界过去将大脑衰老简单归咎于“零部件老化”或损伤缓慢积累的传统观点。 相反，中年以后的大脑呈现出一种由免疫系统、血管系统和神经系统共同参与的协调性重塑过程。\n\n基因数据可用于评估您患某些疾病的风险。图片来源：纽约基因组中心\n\n这种发生在半百之年后的生物学转向，恰好对应了阿尔茨海默病等神经退行性疾病风险陡增的敏感时间窗口。 通过破解这一阶段的微观机制，科学家得以从全新的视角审视为何岁月会成为大脑健康的最大敌人。\n\n免疫卫士大换血与屏障失守\n\n在这场海马体细胞的大重组中，最令人吃惊的变化发生在小胶质细胞身上。 作为大脑内部原生的驻留免疫细胞，小胶质细胞长期以来被学术界认为是在胚胎发育期形成并伴随人类终生的。\n\n然而单细胞测序数据表明，在50岁到75岁这个时间段内，那些自出生起就陪伴我们的原始小胶质细胞数量开始急剧锐减。 取而代之的，是一群分子特征与外周血液中循环免疫细胞高度相似的新来者。\n\n这群新入侵或转化的免疫细胞带有更强烈的促炎标签，极大加剧了脑内的持续性慢性炎症状态。 通讯作者任冰教授指出，当小胶质细胞无法正常履行日常的清理与维护职责时，脑内有害代谢废物便会加速堆积。\n\n图片来源：纽约基因组中心\n\n与免疫系统大换血相伴随的，还有维护血脑屏障的关键细胞数量的显著减少。 血脑屏障作为阻隔血液中有毒有害物质侵入中枢神经系统的防线，其细胞基底的流失让大脑内部环境变得愈发脆弱。\n\n当防御屏障出现漏洞，配合上新一代免疫细胞引发的炎症风暴，最终为神经退行性病变铺平了道路。\n[img:9269490134959522304]\n3D基因组紊乱与十年科学工程的里程碑\n\n除了免疫和血管系统的深刻变革，研究人员还在多种脑细胞中观察到了基因组物理结构的普遍衰退。 在正常细胞核内部，长达两米的DNA分子并非随意堆叠，而是折叠成极其精密的3D三维架构以调控基因表达。\n\n然而随着年龄跨过50岁大关，这种高度有序的折叠结构开始出现大面积混乱与松散。 加州大学圣地亚哥分校的内森·泽姆克博士表示，基因组三维组织的退化很可能是驱动大脑整体衰老的最底层分子机制。\n\n这一重要突破并非偶然，它构成了美国国立卫生研究院耗时十年打造的“4D核组”计划的核心成果之一。 该计划汇聚了全美顶级研究团队，旨在从时间和空间双重维度解析人类基因组结构的动态变化。\n\n徐向民教授强调，了解这种多系统协同重塑的过程，能够为未来开发干预药物提供全新的分子靶点。 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