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芯片上种出“活大脑”,人类细胞竟能当“电脑”用!

芯片上种出“活大脑”,人类细胞竟能当“电脑”用!
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在武汉大学生命科学实验室的显微镜下,有个神奇的小东西正在悄悄“工作”。指甲盖大小的芯片上,一团由人类干细胞诱导分化形成的类器官微微发光,里面的神经细胞,正像我们大脑里的神经元一样,不断释放微弱电信号,还能“指挥”旁边的微型心脏规律跳动。

这不是科幻电影里的特效场景,而是武汉大学陈璞教授团队公布的一项研究成果:跨胚层共发育类器官芯片。简单说,就是科学家们用人类干细胞,在芯片上“种”出了一个迷你版的“心脑系统”。它最特别的地方,不只在于同时长出了“脑”和“心”,更在于这两个器官样结构之间建立了联系,能够模拟人体中心脑联动的部分过程。

图源:中原网报道

我们平时用的电脑、手机,核心芯片几乎都是用硅做的,靠二进制信号完成运算。今天的芯片本身也能配合存储单元、算法系统和专用架构,实现记忆、学习等复杂功能,人工智能芯片更是这一方向的重要代表。相比之下,人脑的特别之处在于,它不依赖外部模块的拼接,就能把信息处理、学习、记忆、适应和容错等能力高度整合在一个生命系统之中。也正因如此,科学家一直在探索,能不能借助真实神经元网络,更深入理解大脑工作方式,并发展新的实验与计算模型。

武大团队选用的,是一种叫“人诱导多能干细胞”的细胞。这种细胞不用从胚胎中获取,却能在合适条件下分化成多种人体细胞,比如脑细胞、心肌细胞。科学家把它们放进提前设计好的芯片中,这块芯片内部布满了微小流道和电极,就像一个高度精密的“微型培养室”。在温度、营养和生化信号的共同调控下,原本一团干细胞开始有序分化:一端形成脑组织,一端形成心脏样组织,中间还出现了连接两者的神经纤维。

图源:《Engineering》论文

图源: NIGMS (NIH) Image Gallery

大约4周后,这个“心脑共发体”逐渐成熟。显微镜下,脑类器官中的神经元不断放电,心脏样组织则保持自主搏动。更重要的是,当研究人员对脑部区域进行刺激时,心脏搏动节律也会发生变化。这说明,在实验环境下,芯片上的神经组织已经能够对心脏活动产生调控作用,初步呈现出类似人体心脑联动的特征。

可能有人会问:这不就是在芯片上培育了两个“迷你器官”吗,和“计算”有什么关系?关键就在于芯片上的微电极阵列。它相当于给这些神经元装上了一套“信号采集器”,能实时记录神经元放电,再把这些生物电信号转化为可分析的数据。换句话说,科学家不仅是在培育器官,也是在观察活体神经网络如何处理信息、如何对刺激作出反应。

这项成果最大的突破,在于它不再停留在“单个器官各自培养”的阶段。过去,类器官研究往往是分别培育迷你脑、迷你心脏,却很难模拟器官之间的真实联系。而这次,研究团队攻克了“跨胚层共发育”的难题,让来源相同的干细胞在同一平台上同步分化,形成了有功能连接的复合系统。这让实验模型更接近真实人体,也让很多过去难以观察的问题,有了新的研究条件。比如,研究人员可以更直观地观察神经活动变化是否会影响心脏搏动,也可以进一步分析某些药物在作用于神经系统后,是否会连带引起心脏功能的改变。

它的现实价值,首先体现在新药研发上。长期以来,新药研发高度依赖动物实验,但动物和人的生理结构毕竟存在差异,很多药物在动物身上有效,到了人体却效果有限,甚至会出现副作用。现在这种基于人类细胞构建的类器官芯片,能够更直接地模拟人体反应。比如测试药物时,研究人员可以同时观察心脏搏动和神经活动的变化,更早判断药物是否有效、是否存在风险。

因此,这项技术真正重要的地方,其实是为医学研究提供了更接近人体真实状态的实验模型。未来,它有望先在药物筛选、疾病研究、神经修复等领域发挥作用。至于“生物计算机”这样的更长远目标,现在还属于前沿探索阶段。

从单一器官到多器官联动,从静态培养到功能互作,这块小小的芯片展示了一种新的研究思路:要理解生命,不能只看孤立的器官,还要看它们如何彼此连接、相互影响。某种意义上,这项突破让我们离人体运作的真实图景,又近了一步。

供稿单位:重庆理工大学计算机科学与工程学院

作者:重庆理工大学 汪芷丞

审核专家:车蕊彤

声明:除原创内容及特别说明之外,部分图片来源网络,非商业用途,仅作为科普传播素材,版权归原作者所有,若有侵权,请联系删除。

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  1. CONNECT:[ UseTime:0.000543s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000827s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000317s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.005182s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000546s ]
  6. SELECT * FROM `set` [ RunTime:0.000199s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000741s ]
  8. SELECT * FROM `article` WHERE `id` = 557725 LIMIT 1 [ RunTime:0.003252s ]
  9. UPDATE `article` SET `lasttime` = 1776993735 WHERE `id` = 557725 [ RunTime:0.000737s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000285s ]
  11. SELECT * FROM `article` WHERE `id` < 557725 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001099s ]
  12. SELECT * FROM `article` WHERE `id` > 557725 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000690s ]
  13. SELECT * FROM `article` WHERE `id` < 557725 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006448s ]
  14. SELECT * FROM `article` WHERE `id` < 557725 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004940s ]
  15. SELECT * FROM `article` WHERE `id` < 557725 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002643s ]
0.109808s