Pathophysiological and behavioral deficits in developing mice following rotational acceleration-deceleration...

Area of Science:

• Neuroscience
• Pediatric Trauma
• Animal Models

Background:

• Abusive head trauma (AHT) is a critical cause of mortality in infants and young children.
• Understanding AHT's pathophysiology is crucial for developing effective interventions.

Purpose of the Study:

• To establish and characterize a novel mouse model of repetitive abusive head trauma (AHT).
• To investigate the acute and long-term pathophysiological and behavioral consequences of AHT in a developing mammalian brain.

Main Methods:

• A 12-day-old mouse model was subjected to repetitive sagittal head shaking (30-100 episodes) to simulate AHT.
• Physiological parameters (mortality, consciousness, oxygen saturation, cerebral blood flow) and neuropathological changes were assessed.
• Behavioral tests evaluated sensorimotor, cognitive, and anxiety-like behaviors at various post-injury days.

Main Results:

• Mortality and recovery time correlated with injury severity and number of shakes.
• Severe reduction in cerebral blood perfusion, brain-blood barrier damage, and edema were observed.
• While sensorimotor function recovered by 28 days post-injury, cognitive deficits and anxiety-like behaviors persisted.
• Proinflammatory responses and neuronal degeneration were noted in specific brain regions.

Conclusions:

• The developed mouse model partially replicates key aspects of human AHT, including injury mechanisms and outcomes.
• Repetitive head trauma induces hypoxia/ischemia, contributing to secondary brain injury in developing brains.
• This model provides a valuable platform for studying AHT mechanisms and testing potential therapies.