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Related Concept Videos

Regulation of Hematopoietic Stem Cells01:01

Regulation of Hematopoietic Stem Cells

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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...
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Stem cell therapy is a method used in regenerative medicine to repair and restore function to damaged tissues and organs. Stem cells have the potential to proliferate and differentiate into various tissue types, making them ideal candidates for tissue regeneration. For example, hematopoietic stem cell transplants are commonly used in blood cancer treatment to replenish damaged bone marrow and restore healthy blood cells.
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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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The development of lymphatic tissues and vessels in embryonic life begins around the fifth week. These structures originate from the mesoderm layer, with lymph sacs emerging from developing veins.
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Lymphoid cells and tissues are integral to the immune system, which is crucial in maintaining our body's defense against harmful pathogens. They form the building blocks of lymphoid organs, which include the spleen, thymus, and lymph nodes.
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Stem cell-driven lymphatic remodeling coordinates tissue regeneration.

Shiri Gur-Cohen1, Hanseul Yang1, Sanjeethan C Baksh1

  • 1Howard Hughes Medical Institute, Robin Chemers Neustein Laboratory of Mammalian Cell Biology and Development, The Rockefeller University, New York, NY 10065, USA.

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Summary
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Lymphatic capillaries are crucial stem cell (SC) niche components. A secretome switch in SCs controls lymphatic behavior, impacting tissue regeneration and hair follicle cycling.

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Area of Science:

  • Stem cell biology
  • Tissue regeneration
  • Vascular biology

Background:

  • Stem cells (SCs) are vital for tissue homeostasis and repair, residing in specialized microenvironments (niches).
  • The intricate roles of SC niches in orchestrating tissue growth are still being elucidated.
  • Lymphatic capillaries have not been widely recognized as key SC-niche components.

Purpose of the Study:

  • To identify and characterize the role of lymphatic capillaries as critical components of the stem cell niche.
  • To investigate the dynamic interactions between hair follicle stem cells and lymphatic capillaries during tissue regeneration.
  • To unravel the molecular mechanisms by which stem cells regulate lymphatic behavior.

Main Methods:

  • Utilized a mouse model to study stem cell-niche interactions.
  • Investigated the secretome of hair follicle stem cells.
  • Analyzed the behavior of lymphatic capillaries in response to stem cell signaling.
  • Examined the impact of lymphatic perturbation and secretome disruption on hair follicle cycling and tissue regeneration.

Main Results:

  • Identified lymphatic capillaries as integral components of the hair follicle stem cell niche.
  • Discovered a secretome switch in stem cells: resting SCs express Angiopoietin-like protein 7 (Angptl7) to promote lymphatic drainage, while activated SCs switch to Angiopoietin-like protein 4 (Angptl4) for transient lymphatic dissociation.
  • Demonstrated that perturbations in lymphatic capillaries or the stem cell secretome lead to precocious hair follicle cycling and asynchronous tissue regeneration.

Conclusions:

  • Lymphatic capillaries are essential stem cell niche components that dynamically regulate tissue regeneration.
  • The stem cell secretome, through specific angiopoietins, controls lymphatic behavior and influences tissue repair processes.
  • Understanding these SC-lymphatic interactions provides insights into coordinating stem cell activity for effective tissue regeneration.