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相关概念视频

Lineage Commitment01:21

Lineage Commitment

Commitment is the  process whereby stem cells:
Mesenchymal Stem Cells01:19

Mesenchymal Stem Cells

Mesenchymal stem cells (MSCs) are adult stem cells that can differentiate into most connective tissue cell types, except for hematopoietic cells, depending upon the source of MSCs. For example, bone-marrow-derived MSCs (BM-MSCs) can differentiate into osteocytes, hepatocytes, and pancreatic and neuronal cells. MSCs can be isolated from various sources such as bone marrow, placenta, adipose tissue, teeth, and Wharton’s jelly, a gelatinous substance in the umbilical cord. The ease of their access...
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Stem Cell Niche

The stem cell niche is the dynamic microenvironment where stem cells reside. Inside these niches, the cells may remain undifferentiated, undergo high self-renewal, or become lineage-specific progenitors. Stem cells coexist with other niche cells, such as stromal cells. They also interact closely with the ECM. Cell-cell and cell-matrix communication occur via adhesion molecules or soluble factors that signal the stem cells and determine their fate. Stromal cells also provide survival signals to...
Multipotency and Niche of Bulge Stem Cell01:06

Multipotency and Niche of Bulge Stem Cell

A hair follicle or HF is a small part of the skin that produces the hair shaft. Paul Gerson Unna was the first to observe a bulge in the human hair follicle's outer root sheath (ORS). The bulge is present between the sebaceous gland and the arrector pili muscle and is the niche for hair follicle stem cells (HFSCs). The bulge is also a niche for melanocyte stem cells, and their loss results in graying of hair. The HFSCs express Sox9 and Lhx2, which help them maintain stemness and prevent...
Maintenance of the ES Cell State01:14

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The cells of the blastocyst inner cell mass only remain pluripotent for a short time. This state of pluripotency and self-renewal can be maintained in embryonic stem (ES) cell culture by adding specific chemicals or growth factors to ensure the cells can continue dividing and later differentiate into different cell types. In some cases, the cells are grown on a feeder layer of differentiated cells, which provides the growth factors and extracellular matrix components necessary for stem cell...
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相关实验视频

Updated: May 12, 2026

Human Pluripotent Stem Cell Culture on Polyvinyl Alcohol-Co-Itaconic Acid Hydrogels with Varying Stiffness Under Xeno-Free Conditions
11:37

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矩阵弹性指导干细胞谱系的规范.

Adam J Engler1, Shamik Sen, H Lee Sweeney

  • 1Pennsylvania Muscle Institute, University of Pennsylvania, Philadelphia, 19104, USA.

Cell
|August 23, 2006
PubMed
概括
此摘要是机器生成的。

组织弹性引导介质干细胞 (MSCs) 到神经,肌肉或骨等特定的血统. 这种由矩阵指导的细胞命运承诺,受组织度的影响,对再生医学有影响.

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科学领域:

  • 生物材料科学 生物材料科学
  • 干细胞生物学 干细胞生物学
  • 组织工程是组织工程.

背景情况:

  • 在体内微环境显著影响干细胞的行为和分化.
  • 描述和控制软组织微环境的物理特性仍然具有挑战性.
  • 介质细胞干细胞 (MSC) 是具有各种治疗应用潜力的多能细胞.

研究的目的:

  • 调查矩阵弹性的作用在指导介质干细胞 (MSC) 谱系规范中的作用.
  • 为了确定MSC血统承诺的时间进程,以响应机械线索.
  • 为了确定底层的分子机制,弹性依赖MSC差异化.

主要方法:

  • 在柔软的矩阵上培养纯粹的MSC,具有模拟大脑,肌肉和骨的不同弹性模块.
  • 使用特定标记物评估细胞系特征和表型.
  • 通过抑制非肌肉肌素II的细胞收缩性的操纵.
  • 时间过程实验来评估血统的可塑性和承诺.

主要成果:

  • MSCs表现出基于矩阵弹性的谱系特异化:软矩阵诱导神经发生,中间矩阵诱导肌发生,硬矩阵诱导骨发生.
  • 在培养的第一个星期内,可以通过可溶性因子进行血统重编程.
  • 经过几周的时间,MSCs承诺通过矩阵弹性来决定血统,类似于分化的细胞.
  • 抑制非肌肉肌素II取消了弹性导向血统规范,但没有显著影响细胞形状或功能.

结论:

  • 矩阵弹性是一个关键的物理线索,它决定了MSC谱系的规范和承诺.
  • 机械微环境在控制干细胞命运方面发挥着根本性的作用.
  • 这些发现对理解体内干细胞行为和开发新型再生疗法具有重大意义.