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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...
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Unveiling Mesenchymal Stromal Cells' Organizing Function in Regeneration.

Peter P Nimiritsky1,2, Roman Yu Eremichev3, Natalya A Alexandrushkina4,5

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Mesenchymal stromal cells (MSCs) delivered as cell sheets (CS) may organize regeneration by creating a supportive microenvironment. This approach enhances adult stem cell therapy outcomes in regenerative medicine.

Keywords:
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Area of Science:

  • Regenerative Medicine
  • Stem Cell Biology
  • Tissue Engineering

Background:

  • Adult stem cells are crucial for regeneration but require a specific microenvironment (niche) to function effectively.
  • Current cell therapy often delivers suspended adult stem cells, which may not achieve optimal regeneration.
  • The ineffectiveness of current methods highlights the need for strategies that provide a receptive microenvironment for engraftment.

Purpose of the Study:

  • To explore the potential of mesenchymal stromal cells (MSCs) as organizers of regeneration.
  • To investigate whether the regenerative organizing function of MSCs emerges specifically in cell sheets (CS).
  • To propose a new therapeutic mechanism for cell sheet-based regenerative medicine.

Main Methods:

  • Review of existing literature on adult stem cell function and regenerative medicine.
  • Analysis of the role of microenvironment in stem cell engraftment and performance.
  • Conceptualization of cell sheets (CS) as organized structures of MSCs and their associated microenvironment.

Main Results:

  • Mesenchymal stromal cells (MSCs) possess the potential to act as regeneration organizers.
  • This organizing function is hypothesized to emerge when MSCs are delivered in self-organized cell sheets (CS).
  • Cell sheets provide a tissue-like structure with extracellular matrix and soluble factors, creating a conducive niche.

Conclusions:

  • Mesenchymal stromal cells (MSCs) in cell sheet (CS) form may actively organize the regenerative process.
  • This perspective shifts the understanding of cell sheet-based therapy from passive cell delivery to active microenvironment engineering.
  • Optimizing the microenvironment via MSC-derived cell sheets could significantly improve regenerative medicine outcomes.