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Commitment is the  process whereby stem cells:
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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 access...
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Human Pluripotent Stem Cell Culture on Polyvinyl Alcohol-Co-Itaconic Acid Hydrogels with Varying Stiffness Under Xeno-Free Conditions
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Published on: February 3, 2018

Matrix elasticity directs stem cell lineage specification.

Adam J Engler1, Shamik Sen, H Lee Sweeney

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

Cell
|August 23, 2006
PubMed
Summary
This summary is machine-generated.

Tissue elasticity guides mesenchymal stem cells (MSCs) to specific lineages like neural, muscle, or bone. This matrix-directed cell fate commitment, influenced by tissue stiffness, has implications for regenerative medicine.

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Area of Science:

  • Biomaterials Science
  • Stem Cell Biology
  • Tissue Engineering

Background:

  • The in vivo microenvironment significantly influences stem cell behavior and differentiation.
  • Characterizing and controlling the physical properties of soft tissue microenvironments remains challenging.
  • Mesenchymal stem cells (MSCs) are multipotent cells with potential for various therapeutic applications.

Purpose of the Study:

  • To investigate the role of matrix elasticity in directing mesenchymal stem cell (MSC) lineage specification.
  • To determine the time course of MSC lineage commitment in response to mechanical cues.
  • To identify molecular mechanisms underlying elasticity-dependent MSC differentiation.

Main Methods:

  • Culture of naive MSCs on soft matrices with varying elastic moduli mimicking brain, muscle, and bone.
  • Assessment of cell lineage specification and phenotype using specific markers.
  • Manipulation of cellular contractility via inhibition of nonmuscle myosin II.
  • Time-course experiments to evaluate lineage plasticity and commitment.

Main Results:

  • MSCs exhibited lineage-specific differentiation based on matrix elasticity: soft matrices induced neurogenesis, intermediate matrices induced myogenesis, and rigid matrices induced osteogenesis.
  • Lineage reprogramming was possible with soluble factors within the first week of culture.
  • After several weeks, MSCs committed to the lineage dictated by matrix elasticity, similar to differentiated cells.
  • Inhibition of nonmuscle myosin II abolished elasticity-directed lineage specification without significantly affecting cell shape or function.

Conclusions:

  • Matrix elasticity is a critical physical cue that dictates MSC lineage specification and commitment.
  • The mechanical microenvironment plays a fundamental role in controlling stem cell fate.
  • These findings have significant implications for understanding in vivo stem cell behavior and developing novel regenerative therapies.