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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...

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Proliferation and Differentiation of Murine Myeloid Precursor 32D/G-CSF-R Cells

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Hematopoietic stem cell functional failure in interleukin-2-deficient mice.

J Chen¹, C M Astle, D E Harrison

¹Hematology Branch, National Heart, Lung and Blood Institute, Bethesda, MD 20892-1652, USA. chenji@nhlbi.nih.gov

Journal of Hematotherapy & Stem Cell Research

|February 20, 2003

Summary

Interleukin-2 (IL-2) deficiency causes hematological failure and autoimmune responses in mice. Despite normal proliferation, hematopoietic stem cells (HSCs) from IL-2 deficient mice are functionally defective in repopulating blood cell lineages.

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Intrafemoral Injection of Human Hematopoietic Stem and Progenitor Cells into Immunocompromised Mice

Intrafemoral Injection of Human Hematopoietic Stem and Progenitor Cells into Immunocompromised Mice

Published on: December 8, 2023

Area of Science:

Immunology
Hematology
Stem Cell Biology

Background:

Interleukin-2 (IL-2) is crucial for lymphocyte development and function.
IL-2 deficiency is known to cause severe immunodeficiency and autoimmune diseases.
The impact of IL-2 deficiency on hematopoiesis, particularly on hematopoietic stem cells (HSCs), requires further investigation.

Purpose of the Study:

To investigate the effects of interleukin-2 (IL-2) deficiency on hematopoiesis.
To assess the function of hematopoietic stem cells (HSCs) in IL-2 deficient mice.

Main Methods:

Gene-targeted Il2 null (Il2(-/-)) mice and wild-type (Il2(+/+)) littermates were used.
Cellular compositions in peripheral blood, spleen, thymus, and bone marrow were analyzed using Advia 120 Hematology system and fluorescence-activated cell staining (FACS).
Long-term HSC function was evaluated in vivo using competitive repopulation assays.

Main Results:

Il2(-/-) mice exhibited hematological failure, including anemia, lymphocytopenia, and thrombocytopenia, along with splenomegaly and thymus involution.
Bone marrow cells (BMCs) from Il2(-/-) mice showed normal cell numbers but contained increased populations of HSC and progenitor cells.
Competitive repopulation assays revealed a 10- to 20-fold reduction in HSC repopulating ability in Il2(-/-) mice, affecting both myeloid and lymphoid lineages.

Conclusions:

IL-2 deficiency leads to functional defects in hematopoietic stem cells (HSCs), despite normal proliferation capacity.
These HSC defects contribute to the observed hematological failure and autoimmune responses in Il2(-/-) mice.
IL-2 plays a critical role in maintaining HSC function essential for long-term hematopoiesis.