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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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Epigenetic mechanisms driving lineage commitment in mesenchymal stem cells.

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Summary

Resident stromal stem cells, also known as mesenchymal stem cells, are not a uniform population. In vivo, their programming varies by tissue location, impacting therapeutic applications.

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EpigeneticsMesenchymal stem cellsOdontoblastOsteoblastPericytesPerivascular cellsRNAseqTranscriptomics

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Area of Science:

  • Cell Biology
  • Stem Cell Research
  • Regenerative Medicine

Background:

  • Mesenchymal stem cells (MSCs) were traditionally viewed as a homogeneous population after in vitro expansion.
  • Recent advancements allow for in vivo cell tracing and molecular profiling.
  • Understanding the in vivo nature of MSCs is crucial for their therapeutic potential.

Purpose of the Study:

  • To re-evaluate the in vivo characteristics of resident stromal stem cells.
  • To investigate the influence of tissue location on stem cell programming.
  • To assess the implications of in vivo heterogeneity for tissue engineering.

Main Methods:

  • Utilized advanced cell tracing techniques.
  • Performed comprehensive transcriptomic analyses.
  • Conducted epigenomic profiling of resident stem cells.

Main Results:

  • In vivo resident stromal stem cells exhibit significant programming based on tissue location.
  • Distinct epigenetic landscapes and gene transcription signatures were observed prior to in vitro expansion.
  • This in vivo heterogeneity challenges the concept of a uniform stem cell population.

Conclusions:

  • Resident stromal stem cells are not a homogeneous population in vivo.
  • Tissue-specific programming influences stem cell identity and function.
  • These findings have significant implications for the use of mesenchymal stem cells in therapeutic tissue engineering.