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Related Concept Videos

Replicative Cell Senescence02:15

Replicative Cell Senescence

Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds the telomeric...
Replicative Cell Senescence02:15

Replicative Cell Senescence

Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds the telomeric...
Regulation of Hematopoietic Stem Cells01:01

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...
Multipotency of Hematopoietic Stem Cells01:19

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...
DNA Damage Can Stall the Cell Cycle02:36

DNA Damage Can Stall the Cell Cycle

In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
DNA Damage can Stall the Cell Cycle02:36

DNA Damage can Stall the Cell Cycle

In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...

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Utilizing Murine Inducible Telomerase Alleles in the Studies of Tissue Degeneration/Regeneration and Cancer
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Telomere dysfunction and cell cycle checkpoints in hematopoietic stem cell aging.

Zhenyu Ju1, Junling Zhang2, Yingdai Gao3

  • 1School of Medicine, Hangzhou Normal University, Hangzhou, China. zhenyuju@hotmail.com.

International Journal of Hematology
|June 15, 2011
PubMed
Summary
This summary is machine-generated.

Aging tissue stem cells experience degeneration due to telomere shortening and cell cycle checkpoint issues. Understanding hematopoietic stem cell aging offers new therapeutic targets for regenerative medicine.

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Area of Science:

  • Gerontology
  • Stem Cell Biology
  • Molecular Biology

Background:

  • Stem cell functional decline is linked to tissue degeneration during aging.
  • Telomere attrition and cell cycle checkpoint dysregulation are key contributors to stem cell aging.
  • Hematopoietic stem cells (HSCs) are particularly vulnerable, with telomere dysfunction implicated in various blood disorders.

Purpose of the Study:

  • To explore the molecular mechanisms underlying stem cell aging, focusing on telomere biology and cell cycle regulation.
  • To investigate the role of DNA damage response pathways in maintaining hematopoietic stem cell function.
  • To identify potential therapeutic targets for age-related stem cell dysfunction and regenerative medicine.

Main Methods:

  • Review of studies on human genetic diseases and gene-targeted animal models.
  • Analysis of the impact of telomere dysfunction on cellular senescence and apoptosis.
  • Examination of the roles of key DNA damage response proteins (ATM, CHK2, p53, p21, p16/p19ARF) in HSC maintenance.

Main Results:

  • Telomere dysfunction triggers DNA damage responses, leading to senescence or apoptosis in stem cells.
  • Telomere shortening and telomerase mutations are associated with hematological disorders affecting HSCs.
  • DNA damage response pathways are critical for HSC self-renewal and maintenance, regardless of telomere status.

Conclusions:

  • Telomere integrity and cell cycle control are crucial for stem cell aging and function.
  • Understanding HSC aging mechanisms, including DNA damage responses, is vital for developing regenerative therapies.
  • Targeting molecular pathways involved in HSC aging may offer new avenues for treating age-related diseases.