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Published on: February 21, 2018
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.
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.
