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beta2 microglobulin-deficient (B2m(null)) NOD/SCID mice are excellent recipients for studying human stem cell
1Department of Immunology, The Weizmann Institute and the Department of Obstetrics and Gynecology, Kaplan Hospital, Rehovot, Israel.
Blood
|May 16, 2000
Summary
This study identifies a more efficient method for assessing human stem cells using NOD/SCID/B2m(null) mice. This improved assay reveals a higher frequency of stem cell repopulating cells (SRC) and suggests SRC self-renewal capabilities.
Area of Science:
- Hematology
- Immunology
- Stem Cell Biology
Background:
- Human SCID repopulating cells (SRC) are crucial for bone marrow reconstitution.
- Current methods for assessing SRC frequency in immune-deficient mice have limitations.
- NOD/SCID mice are commonly used but have restricted engraftment capacity.
Purpose of the Study:
- To establish a more sensitive functional assay for human stem cells.
- To determine the frequency of SRC in human cord blood using a novel mouse model.
- To investigate the self-renewal capacity of SRC.
Main Methods:
- Transplantation of human cord blood mononuclear cells into NOD/SCID/B2m(null) mice.
- Assessment of multilineage differentiation and engraftment in murine bone marrow.
- Serial transplantation of CD34+ cells from primary recipients into secondary NOD/SCID/B2m(null) mice.
Main Results:
- A significantly higher frequency of SRC was observed in NOD/SCID/B2m(null) mice compared to NOD/SCID mice (over 11-fold increase).
- As few as 8 x 10(4) human cord blood mononuclear cells led to multilineage engraftment.
- CD34+ cells from primary recipients could engraft secondary recipients, indicating SRC self-renewal.
Conclusions:
- NOD/SCID/B2m(null) mice provide a superior model for functional assessment of human stem cells.
- This enhanced assay reveals a greater SRC frequency and supports their self-renewal potential.
- The established model closely mimics aspects of autologous stem cell transplantation.