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Updated: Aug 1, 2026
A Mouse Model of in Utero Transplantation
Published on: January 27, 2011
Murine neonate hemopoiesis following in utero total-body irradiation
Insights
Prenatal gamma irradiation significantly impacts mouse hematopoiesis, causing greater damage and instability in juveniles compared to neonates. Higher doses led to more severe effects on blood cell production and organ cellularity.
Area of Science:
- Developmental biology
- Radiation biology
- Hematology
Background:
- Prenatal exposure to ionizing radiation can disrupt fetal development.
- Hematopoiesis, the process of blood cell formation, is particularly sensitive to radiation damage.
- Understanding the long-term effects of radiation on developing hematopoietic systems is crucial for risk assessment.
Purpose of the Study:
- To investigate the residual effects of prenatal gamma irradiation on neonatal and juvenile mouse hematopoiesis.
- To compare the sensitivity of different hematopoietic compartments and developmental stages to radiation injury.
- To determine the dose-dependent effects of irradiation on erythropoiesis and overall cellularity.
Main Methods:
- Pregnant mice were irradiated with cobalt-60 gamma rays (50-200 rad) on day 10.5 of gestation.
- Hematopoietic parameters were assessed in neonates (day 9) and juveniles (day 15) post-irradiation.
- Peripheral blood hemogram indices, spleen and bone marrow cellularity, and hematopoietic progenitor cells (BFU-E, CFU-E, GM-CFC, Meg-CFC) were analyzed.
- Erythropoietic activity in the bone marrow and spleen was evaluated.
Main Results:
- Day-15 juveniles exhibited greater hematopoietic damage and peripheral blood hemogram fluctuations than day-9 neonates.
- Spleen cellularity was more affected by irradiation than bone marrow cellularity.
- Bone marrow hematopoietic progenitor cells (erythroid, granulocyte-macrophage, megakaryocyte) showed significant radiation injury.
- Increasing irradiation doses resulted in a more pronounced decrease in medullary and splenic erythropoietic activity.
Conclusions:
- Prenatal gamma irradiation induces lasting deficits in mouse hematopoiesis, with later developmental stages being more vulnerable.
- The study highlights the differential sensitivity of hematopoietic compartments and organs to radiation.
- Dose-dependent effects underscore the critical impact of radiation levels on hematopoietic recovery and function.
Abstract:
Irradiation (50-200 rad of cobalt-60 gamma rays) on day 10.5 of gestation in the mouse had the following residual effects on neonate and juvenile hemopoiesis: (a) greater damage observed in the day-15 juvenile than in the day-9 neonate; (b) greater fluctuation of peripheral blood hemogram indices from normal values in the day-15 animal than in the day-9 animal; (c) spleen cellularity affected more than bone marrow cellularity; (d) greater radiation injury reflected by bone marrow hemopoietic progenitor cells (erythroid: BFU-E and CFU-E; granulocyte-macrophage: GM-CFC; megakaryocyte: Meg-CFC), and (e) a more pronounced decrease in medulla- and spleen-erythropoietic activity with each increase in dose of irradiation.
