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Pluripotent stem cells with normal or reduced self renewal survive lethal irradiation
Experimental Hematology
|August 1, 1988
Summary
Marrow cell transfusions improved survival in irradiated mice. However, donor cells were often replaced by host cells, suggesting some donor stem cells may have a shortened lifespan.
Area of Science:
- Hematology
- Immunology
- Radiation Biology
Background:
- Bone marrow transplantation is a critical therapy for radiation-induced damage.
- Understanding donor cell engraftment and persistence is key to improving transplant outcomes.
Purpose of the Study:
- To investigate the long-term survival and chimerism of donor cells following marrow transfusion in lethally irradiated mice.
- To determine if temporary donor cell repopulation is due to short-lived stem cells.
Main Methods:
- Mice were lethally irradiated and transfused with varying doses of congenic marrow cells.
- Alloenzyme markers were used to distinguish host and donor cells in peripheral blood.
- Primary hosts were used to generate secondary hosts for retransplantation studies.
Main Results:
- Transfusion of 10,000-20,000 marrow cells resulted in 15%-50% survival at 30+ days post-LD90/LD100 radiation.
- Initially, donor cells were present in all hosts.
- Between 55%-92% of animals achieved 100% host type by 12-24 weeks.
- Temporary persistence of donor and host cells was observed in secondary hosts.
Conclusions:
- Marrow cell transfusion can improve survival after lethal irradiation.
- A significant proportion of transfused donor stem cells may have an intrinsically shortened lifespan, leading to host cell repopulation.
- Further research is needed to understand stem cell longevity in transplantation.