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Regulation of Hematopoietic Stem Cells

Regulation of Hematopoietic Stem Cells

All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...

The Cell Cycle Control System

The Cell Cycle Control System

The cell cycle is an organized set of events that leads the cell to divide into two daughter cells, each containing chromosomes identical to the parent cell. It is the cell cycle that leads to the formation of an entire organism from a single-cell zygote. Besides, cell division also functions in the renewal or repair of tissues in adult multicellular eukaryotes. For example, in the bone marrow, the stem cells divide to form new blood cells. Although essential for several functions, cell...

The Cell Cycle Control System

The Cell Cycle Control System

The cell cycle regulation directs how a cell proceeds from one phase to the next and begins mitosis. The cell cycle control system includes intracellular regulatory molecules and external triggers. They provide "stop" or "advance" signals and operate at specific cell cycle stages termed checkpoints to ensure that a particular process is completed before the cell advances to the next phase.
Cyclins and cyclin-dependent kinases (Cdks) are the primary cell cycle regulators and function at the cell...

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Multipotency of Hematopoietic Stem Cells

Multipotency of Hematopoietic Stem Cells

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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Several external and internal factors influence the initiation and inhibition of cell division. For instance, the death of nearby cells or the release of human growth hormone (hGH) promotes cell division. In contrast, lack of hGH or crowding of cells can inhibit cell division.
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Related Experiment Video

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Phenotypic Analysis and Isolation of Murine Hematopoietic Stem Cells and Lineage-committed Progenitors

Phenotypic Analysis and Isolation of Murine Hematopoietic Stem Cells and Lineage-committed Progenitors

Published on: July 8, 2012

Cell cycle regulation in hematopoietic stem cells.

Eric M Pietras¹, Matthew R Warr, Emmanuelle Passegué

¹Department of Medicine, Division of Hematology/Oncology, The Eli and Edythe Broad Center for Regenerative Medicine and Stem Cell Research, University of California, San Francisco, San Francisco, CA 94143, USA.

The Journal of Cell Biology

|November 30, 2011

Summary

Hematopoietic stem cells (HSCs) maintain lifelong blood production by balancing proliferation and quiescence. Age-related changes can disrupt this balance, impairing HSC function and potentially causing blood cancers.

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Identification of Key Factors Regulating Self-renewal and Differentiation in EML Hematopoietic Precursor Cells by RNA-sequencing Analysis

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Published on: November 11, 2014

Area of Science:

Hematology
Stem Cell Biology
Cell Cycle Regulation

Background:

Hematopoietic stem cells (HSCs) are crucial for lifelong blood cell production.
Maintaining HSC function requires a precise balance between cell proliferation and quiescence.
This balance is vital for blood homeostasis and preventing cellular damage.

Purpose of the Study:

To explore the critical role of cell cycle regulation in hematopoietic stem cell (HSC) function.
To investigate how the interplay between intrinsic and extrinsic factors modulates HSC cell cycle activity.
To understand how aging affects HSC cell cycle regulation and its consequences.

Main Methods:

Analysis of cell cycle regulatory mechanisms in hematopoietic stem cells.
Investigation of intrinsic cellular processes governing HSC proliferation and quiescence.
Examination of microenvironmental factors influencing HSC behavior.

Main Results:

Cell cycle regulation is critical for HSC function throughout life.
A complex network of intrinsic and extrinsic factors finely tunes HSC cell cycle activity.
Altered HSC cell cycle regulation with age can lead to functional decline and hematological malignancy.

Conclusions:

The precise regulation of the HSC cell cycle is essential for maintaining lifelong hematopoiesis.
Age-associated dysregulation of HSC cell cycle control compromises stem cell function.
Aberrant cell cycle control in HSCs is a potential driver of hematological malignancies.