Metformin Effects on Brain Development Following Cranial Irradiation in a Mouse Model
Abstract
BACKGROUND
Cranial radiation therapy (CRT) is a mainstay of treatment for malignant pediatric brain tumours and high-risk leukemia. Although CRT improves survival, it has been shown to disrupt normal brain development and result in cognitive impairments in cancer survivors. Animal studies suggest that there is potential to promote brain recovery after injury using metformin. Our aim was to evaluate whether metformin can restore brain volume outcomes in a mouse model of CRT.
METHODS
C57BL/6J mice were irradiated with a whole-brain radiation dose of 7 Gy during infancy. Two-weeks of metformin treatment started either on the day of or three days after irradiation. In vivo magnetic resonance imaging was performed prior to irradiation and at three subsequent time points to evaluate the effects of radiation and metformin on brain development.
RESULTS
Widespread volume loss in the irradiated brain appeared within one week of irradiation with limited subsequent recovery in volume outcomes. In many structures, metformin administration starting on the day of irradiation exacerbated radiation-induced injury, particularly in male mice. Metformin treatment starting 3 days after irradiation improved brain volume outcomes in subcortical regions, the olfactory bulbs and structures of the brainstem and cerebellum.
CONCLUSIONS
Our results show that metformin treatment has potential to improve neuroanatomical outcomes after CRT. However, both timing of metformin administration and subject sex…
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