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Stem Cell Niche01:26

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The stem cell niche is the dynamic microenvironment where stem cells reside. Inside these niches, the cells may remain undifferentiated, undergo high self-renewal, or become lineage-specific progenitors. Stem cells coexist with other niche cells, such as stromal cells. They also interact closely with the ECM. Cell-cell and cell-matrix communication occur via adhesion molecules or soluble factors that signal the stem cells and determine their fate. Stromal cells also provide survival signals to...
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A hair follicle or HF is a small part of the skin that produces the hair shaft. Paul Gerson Unna was the first to observe a bulge in the human hair follicle's outer root sheath (ORS). The bulge is present between the sebaceous gland and the arrector pili muscle and is the niche for hair follicle stem cells (HFSCs). The bulge is also a niche for melanocyte stem cells, and their loss results in graying of hair. The HFSCs express Sox9 and Lhx2, which help them maintain stemness and prevent...
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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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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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Stem cells are undifferentiated cells that divide and produce more stem cells or progenitor cells that differentiate into mature, specialized cell types. All the cells in the body are generated from stem cells in the early embryo, but small populations of stem cells are also present in many adult tissues including the bone marrow, brain, skin, and gut. These adult stem cells typically produce the various cell types found in that tissue—to replace cells that are damaged or to continuously...
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Stem cell research aims to find ways to use stem cells to regenerate and repair cellular damage. Over time, most adult cells undergo the wear and tear of aging and lose their ability to divide and repair themselves. Stem cells do not display a particular morphology or function. Adult stem cells, which exist as a small subset of cells in most tissues, keep dividing and can differentiate into a number of specialized cells generally formed by that tissue. These cells enable the body to renew and...
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Assessing Stem Cell DNA Integrity for Cardiac Cell Therapy
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Cardiac stem cell niches.

Annarosa Leri1, Marcello Rota1, Toru Hosoda1

  • 1Departments of Anesthesia and Medicine, Division of Cardiovascular Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA.

Stem Cell Research
|October 1, 2014
PubMed
Summary
This summary is machine-generated.

Stem cell niches are crucial for heart health and repair. Their dysfunction with aging and disease impairs heart muscle formation, highlighting the need to understand niche regulation for cardiac regeneration.

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Area of Science:

  • Cardiovascular Biology
  • Stem Cell Biology
  • Regenerative Medicine

Background:

  • Stem cell niches regulate cardiac homeostasis and repair.
  • Niche dysfunction is linked to aging and cardiac diseases.
  • Impaired niche function leads to poor cardiomyogenesis and myocyte formation.

Purpose of the Study:

  • To review the critical role of cardiac stem cell niches.
  • To discuss mechanisms regulating stem cell function within niches.
  • To highlight the impact of niche alterations on cardiac repair.

Main Methods:

  • Literature review focusing on cardiac stem cell niches.
  • Analysis of regulatory pathways including Notch1 signaling.
  • Discussion of factors affecting stem cell behavior: gap junctions, HIF-1α, metabolic state.

Main Results:

  • Cardiac niches are specialized microdomains controlling stem cell states.
  • Aging and disease alter niche function, hindering repair.
  • Notch1, gap junctions, HIF-1α, and metabolism critically regulate stem cells in niches.

Conclusions:

  • Stem cell niches are vital for maintaining heart function and enabling repair.
  • Understanding niche regulation is essential for developing cardiac regenerative therapies.
  • Targeting niche pathways may restore cardiomyogenesis in diseased hearts.