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相关概念视频

Introduction to Fibroblasts01:09

Introduction to Fibroblasts

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Rudolph Virchow discovered spindle-shaped cells called fibroblasts in 1858. Inactive fibroblasts, called fibrocytes, become activated by various stimuli, such as growth factors and inflammatory cytokines. Activated fibroblasts play a crucial role in wound healing, inflammation, formation of new blood vessels, and cancer progression. Uncontrolled activation of fibroblasts results in fibrosis, the excess deposition of fibrous tissue, which can lead to scarring and affect normal organs. This...
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Formation of Muscle Fibers from Myoblasts01:13

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De novo myogenesis, or the formation of muscle fibers, begins during the early embryonic stages. The skeletal muscle is formed from somites– blocks of embryonic cell layers. The somites are further divided into dermatomes, myotomes, sclerotomes, and syndetomes. Among these, the myotomes give rise to muscle fibers.
Muscle progenitor cells (MPCs) are formed from the myotomes. MPCs express genes that encode the transcription factors Pax3 and Pax7. Along with Pax 3/7, other transcription...
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Mesenchymal Stem Cells01:19

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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...
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The Role of Actin and Myosin in Non-muscle Cells01:10

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Actin and myosin or actomyosin filaments also play a significant role in cells other than those involved in muscle contraction (which occurs within the sarcomere of muscle cells). The mechanism of non-muscle cell contractile bundles was first observed in Dictyostelium and Acanthamoeba. In non-muscle cells, two bundles are commonly found: stress fibers and actomyosin adherence belts. These contractile bundles are smaller and less organized than the ones found in muscle cells. They  are held...
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Common myeloid progenitors (CMPs) are oligopotent cells that can differentiate into granulocytes and macrophages. Granulocytes and macrophages are essential for protecting the body against bacterial, viral, or fungal infections. They migrate from the bone marrow into the circulating blood to reach specific tissue sites where they differentiate and help in immune surveillance. However, they survive only for a few days and must be continuously made available to the organism to maintain a robust...
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Murine Dermal Fibroblast Isolation by FACS
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角质细胞衍生的肌纤维细胞:与其纤维细胞前体的功能差异.

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纤维细胞和肌纤维细胞表现出不同的细胞外基质生产和功能行为,这对于了解角膜伤口愈合和痕至关重要. 这些差异影响着原沉积和细胞迁移.

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科学领域:

  • 眼科医生 眼科 眼科
  • 细胞生物学 细胞生物学
  • 生物材料科学 生物材料科学

背景情况:

  • 角膜痕是导致视力障碍的一个重要原因.
  • 了解角膜伤口愈合的细胞和矩阵动力学对于开发有效的治疗方法至关重要.
  • 纤维细胞和肌纤维细胞来自细胞,在组织重塑中起着不同的作用.

研究的目的:

  • 阐明角膜纤维细胞和肌纤维细胞之间的功能差异.
  • 为了比较这些细胞类型产生的细胞外矩阵 (ECM) 组成和组织.
  • 研究潜伏转化生长因子-β (TGF-β) 激活,伤口愈合和化疗的功能差异.

主要方法:

  • 使用了一种新型的三重转基因小鼠模型 (KeraRT/tetO-Cre/mTmG) 来追踪角质细胞血统.
  • 使用TGF-β1.1.从纤维细胞诱导的肌纤维细胞分化.
  • 分析了ECM组成,原组织 (通过第二波生长显微镜) 和蛋白质表达.
  • 进行了功能性测定,包括潜伏的TGF-β激活,体外伤口愈合,化疗和增殖.

主要成果:

  • 在纤维细胞和肌纤维细胞之间观察到显著的形态差异.
  • 纤维细胞产生更多的角膜原体I和V,而肌纤维细胞产生更多的纤维素和非原ECM成分.
  • 在两种细胞类型之间显示出潜伏的TGF-β激活的显著差异.
  • 在ECM合成,沉积,TGF-β激活和化疗中确定了不同的模式.

结论:

  • 纤维细胞和肌纤维细胞在ECM生产和功能活动中表现出独特的特征.
  • 这些独特的特征可能对它们在角膜伤口愈合的各个阶段的各自作用至关重要.
  • 这些发现提供了关于角膜痕背后的细胞机制和潜在的治疗点的见解.