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Stem cells are undifferentiated cells with extensive self-renewal properties that help them maintain their population during the fetal and adult stages of life. They can specialize in all cell types of the human body. However, their differential potential may vary and can be classified into five types. Stem cells can be (1) Totipotent, (2) Pluripotent, (3) Multipotent, (4) Oligopotent, and (5) Unipotent. Each stem cell has a specific origin; the fertilized egg or zygote is a totipotent cell and...
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The hematopoietic stem cells or HSCs are multipotent, meaning they can differentiate and give rise to all blood and immune cells. HSCs are maintained in the quiescent stage until an external stimulus initiates their differentiation. The multipotent HSCs exist as two heterogeneous populations, long-term repopulating cells (LTRC) and short-term repopulating cells (STRC). The two HSC populations have different surface markers or receptors and are classified based on quiescence and long-term...
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Establishment of Cancer Stem Cell Cultures from Human Conventional Osteosarcoma
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The universal stem cell.

Peter J Quesenberry1, Sicheng Wen2, Laura R Goldberg2,3

  • 1Division of Hematology/Oncology, Brown University, Rhode Island Hospital, Providence, RI, 02903, USA. Pquesenberry@lifespan.org.

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Summary
This summary is machine-generated.

Marrow stem cells are not quiescent but actively cycle, changing potential. These universal stem cells can differentiate into both hematopoietic and non-hematopoietic cells, challenging current dogma.

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Area of Science:

  • Stem cell biology
  • Hematopoiesis
  • Cell cycle regulation

Background:

  • Current understanding posits a quiescent, hierarchical hematopoietic stem cell (HSC) in the marrow.
  • HSCs are believed to have limited potential, primarily differentiating into various blood cell types.

Purpose of the Study:

  • To investigate the cell cycle status and differentiation potential of marrow pluripotent hematopoietic stem cells.
  • To challenge the established dogma regarding HSC quiescence and lineage restriction.

Main Methods:

  • Analysis of surface epitope expression (B220, GR-1) during cell cycle transit.
  • Assessment of differentiation potential of purified hematopoietic stem cells into non-hematopoietic lineages.

Main Results:

  • Marrow pluripotent hematopoietic stem cells are actively cycling, not quiescent.
  • Differentiation potential changes dynamically with cell cycle progression, indicated by altered surface marker expression.
  • Hematopoietic stem cells demonstrated potential to differentiate into non-hematopoietic cells, such as pulmonary epithelial cells.

Conclusions:

  • The marrow stem cell is a universal stem cell with plasticity.
  • Its differentiation potential is not fixed but changes throughout the cell cycle.
  • This universal stem cell can contribute to multiple tissue types beyond hematopoiesis.