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Every normal cell or tissue is embedded in a complex local environment called stroma, consisting of different cell types, a basal membrane, and blood vessels. As normal cells mutate and develop into cancer cells, their local environment also changes to allow cancer progression. The tumor microenvironment (TME) consists of a complex cellular matrix of stromal cells and the developing tumor. The cross-talk between cancer cells and surrounding stromal cells is critical to disrupt normal tissue...
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Following injury, the integrity of the injured tissues must be reestablished. For example, in skin tissue, wound repair involves coordination among resident skin cells, blood mononuclear cells, extracellular matrix, growth factors, and cytokines to complete the healing cascade.
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Regeneration and repair processes are critical in healing damages caused by injury, disease, and aging. In regeneration, the damaged tissue is entirely replaced with new growth that restores the original architecture and function. In contrast, tissue repair usually results in a fixed tissue architecture involving scar formation. Scars generally do not reestablish tissue function and may also exhibit structural abnormalities at the injury site.
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Telocyte Behaviour During Inflammation, Repair and Tumour Stroma Formation.

L Díaz-Flores1, R Gutiérrez2, M González-Gómez2

  • 1Department of Anatomy, Pathology, Histology and Radiology, Faculty of Medicine, University of La Laguna, Tenerife, Spain. kayto54@gmail.com.

Advances in Experimental Medicine and Biology
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Summary

Human CD34+ stromal cells/telocytes (CD34+ SC/TCs) act as progenitor cells in tissue repair. Their in vivo activation involves size increase, inflammatory cell association, proliferation, and differentiation into repair cells.

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Area of Science:

  • Regenerative Medicine
  • Cell Biology
  • Tissue Engineering

Background:

  • CD34+ stromal cells/telocytes (CD34+ SC/TCs) are tissue-resident cells with potential roles in repair.
  • Understanding their behavior is crucial for developing effective regenerative therapies.

Purpose of the Study:

  • To outline the role of human CD34+ SC/TCs as progenitor cells during tissue repair.
  • To describe the in vivo activation phenomena of CD34+ SC/TCs.

Main Methods:

  • In vivo observation of CD34+ SC/TC activation.
  • Comparison of in vivo and in vitro cell behavior.
  • Analysis of cell behavior based on injury type, location, and proximity.

Main Results:

  • CD34+ SC/TCs exhibit increased size, separation from surrounding structures, and association with macrophages upon activation.
  • Activated cells show enhanced synthesis organelles, proliferation (mitosis, high proliferative index), and differentiate into fibroblastic and myofibroblastic cells.
  • Cellular behavior varies significantly based on location, time, injury type (including tumor stroma), and proximity to the injury site.

Conclusions:

  • Human CD34+ SC/TCs are key progenitor cells in tissue repair, demonstrating dynamic in vivo activation and differentiation.
  • Their behavior is context-dependent, influenced by the microenvironment and injury characteristics.
  • Further research into these cells can inform regenerative medicine strategies.