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The continuum model of marrow stem cell regulation
1Roger Williams Medical Center, Department of Research, Providence, Rhode Island 02908, USA. pquesenberry@rwmc.org
Current Opinion in Hematology
|June 7, 2006
Summary
Hematopoietic stem cells exhibit dynamic regulation, with their characteristics and differentiation potential reversibly changing based on cell cycle status. This supports a continuum model of stem cell regulation, not a strict hierarchy.
Area of Science:
- Stem cell biology
- Hematopoiesis
- Cell cycle regulation
Background:
- Stem cell regulation has traditionally been viewed as hierarchical.
- Recent studies suggest a more dynamic model for stem cell behavior.
Purpose of the Study:
- To review the continuum model of stem cell regulation.
- To explore how cell cycle progression influences stem cell phenotype and function.
Main Methods:
- Review of studies using purified murine marrow stem cells.
- Analysis of stem cells driven through the cell cycle by cytokine exposure.
- Investigation of phenotypic changes associated with cell cycle progression.
Main Results:
- Murine marrow stem cells are a cycling population.
- In vivo engraftment, progenitor numbers, and gene expression are labile with cell cycle progression.
- Stem cells demonstrate plasticity, producing non-hematopoietic cells (e.g., lung, muscle) reversibly with cell cycle status.
Conclusions:
- Stem cell regulation follows a continuum model, applicable to both hematopoietic and non-hematopoietic lineages.
- Stem cells exhibit significant plasticity in their differentiation potential.
- Cell cycle status is a key determinant of stem cell function and plasticity.