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相关概念视频

Development of the Heart01:27

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The development of the human heart, a crucial organ, commences from the mesoderm on the 18th or 19th day after fertilization. This process initiates in the cardiogenic area, a group of mesodermal cells at the embryo's head end, which evolves into elongated strands known as cardiogenic cords. These cords undergo a transformation to form hollow-centered endocardial tubes.
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Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic...
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Consider a region consisting of several individual conductors with a definite charge density in the region between these conductors. The second uniqueness theorem states that if the total charge on each conductor and the charge density in the in-between region are known, then the electric field can be uniquely determined.
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The human heart is made up of three layers of tissue that are surrounded by the pericardium, a membrane that protects and confines the heart. The outermost layer, closest to the pericardium, is the epicardium. The pericardial cavity separates the pericardium from the epicardium. Beneath the epicardium is the myocardium, the middle layer, and the endocardium, the innermost layer. There are four chambers of the heart: the right atrium, the right ventricle, the left atrium, and the left ventricle.
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The eukaryotic promoter region is a segment of DNA located upstream of a gene. It contains an RNA polymerase binding site, a transcription start site, and several cis-regulatory sequences.  The proximal promoter region is located in the vicinity of the gene and has cis-regulatory sequences and the core promoter. The core promoter is the binding site for RNA polymerase and is usually located between -35 and +35 nucleotides from the transcription start site. The distal promoter regions are...
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相关实验视频

Updated: Jan 30, 2026

Myocardial Infarction in Neonatal Mice, A Model of Cardiac Regeneration
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一个独特的侧动脉发育计划促进新生儿的心脏再生

Soumyashree Das1, Andrew B Goldstone2, Hanjay Wang2

  • 1Department of Biology, Stanford University, Stanford, CA 94305, USA.

Cell
|January 29, 2019
PubMed
概括

新生小鼠的心脏通过"动脉重组",一个涉及内皮细胞迁移和CXCL12/CXCR4通路的过程,形成新的附带动脉. 这种机制在成年人中受损,为缺血性心脏病提供治疗点.

关键词:
在CXCL动脉化动脉发生附带动脉内皮细胞心脏的再生心肌梗塞

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科学领域:

  • 心血管生物学
  • 复原医学
  • 血管生物学

背景情况:

  • 附带动脉对于血管封闭后的组织存活至关重要,特别是在缺血性心脏病中.
  • 虽然冠状动脉的形成提高了心脏病患者的存活率,但基本的机制和刺激方法在很大程度上是未知的.
  • 了解这些血管的发展对于开发新的治疗策略至关重要.

研究的目的:

  • 为了阐明新生小鼠心脏的附带动脉形成的新机制.
  • 研究内皮细胞迁移和CXCL12/CXCR4信号通路在这个过程中的作用.
  • 探索刺激成人心脏侧面动脉形成的潜力, 以获得治疗效益.

主要方法:

  • 使用新生小鼠心脏损伤模型观察侧面动脉发育.
  • 使用血统追踪和细胞迁移试验来追踪内皮细胞的行为.
  • 研究了CXCR4及其配体CXCL12在附带形成中的表达和功能.
  • 将新生儿心脏与成年老鼠心脏的附带动脉形成进行了比较,并评估了外源性CXCL12的影响.

主要成果:

  • 发现了一种名为"动脉重组"的新机制, 动脉内皮细胞沿着毛细血管迁移,
  • 证明动脉内皮细胞表达CXCR4,毛细血管内皮细胞在受伤时诱导CXCL12.
  • 显示CXCL12或CXCR4的删除显著损害了附带动脉形成和新生儿心脏再生.
  • 观察到大人的心脏大多没有动脉重组,但可以被外源性CXCL12诱导.

结论:

  • 新生儿的心脏具有独特的再生能力通过"动脉重组"形成副动脉.
  • 在新生儿再生过程中,CXCL12/CXCR4信号轴至关重要.
  • 这些发现表明,利用新生儿再生途径可能导致治疗策略,以恢复成人缺血性心脏病的附带循环.