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Functional Interrogation of Adult Hypothalamic Neurogenesis with Focal Radiological Inhibition
Published on: November 14, 2013
Radiation-induced alterations in mouse brain development characterized by magnetic resonance imaging
Lisa M Gazdzinski1, Kyle Cormier, Fred G Lu
1Mouse Imaging Centre, Hospital for Sick Children, Toronto, Canada.
International Journal of Radiation Oncology, Biology, Physics
|September 15, 2012
Summary
Cranial irradiation causes widespread brain developmental deficits in mice, affecting both gray and white matter. These deficits persist, with the olfactory bulb showing progressive volume loss, highlighting potential markers for late effects.
Area of Science:
- Neuroscience
- Developmental Biology
- Radiology
Background:
- Pediatric cranial irradiation can lead to long-term neurodevelopmental deficits.
- Understanding the precise impact of irradiation on brain development is crucial for developing mitigation strategies.
Purpose of the Study:
- To identify specific brain regions with altered development post-cranial irradiation in a mouse model.
- To utilize longitudinal magnetic resonance imaging (MRI) for tracking developmental changes over time.
Main Methods:
- Female C57Bl/6 mice received whole-brain irradiation (7 Gy) at 2.5 weeks of age.
- Longitudinal MRI scans were acquired before and at three time points after irradiation.
- Deformation-based morphometry analyzed volume and growth rate changes.
Main Results:
- Irradiation induced widespread white and gray matter developmental deficits.
- Most regions showed initial volume loss with normal growth rates, remaining smaller than controls.
- The olfactory bulb exhibited a progressive volume deficit due to slower growth post-irradiation.
- Immunohistochemistry revealed demyelination and loss of neural progenitor cells.
Conclusions:
- Longitudinal MRI effectively detects regional neurodevelopmental and growth alterations after whole-brain irradiation in developing mice.
- Persistent or progressive neuroanatomical deficits can serve as markers for late radiation effects.
- High-throughput brain development evaluation may facilitate testing of therapeutic strategies to mitigate irradiation effects.
