Enriched environment improves the cognitive effects from traumatic brain injury in mice

Area of Science:

• Neuroscience
• Behavioral Science
• Rehabilitation Medicine

Background:

• Effective treatments for chronic sequelae following traumatic brain injury (TBI) remain elusive.
• Enriched environments (EE) are known to positively influence brain regulation, behavior, and physiology.
• Pre-exposure or rearing in EE has been linked to improved recovery from brain insults in rodents.

Purpose of the Study:

• To investigate the impact of transitioning to an enriched environment (EE) after mild traumatic brain injury (mTBI) on behavioral and cognitive recovery in mice.
• To assess the efficacy of EE as a rehabilitative intervention following mTBI.

Main Methods:

• A weight-drop model (30g or 50g) was used to induce mTBI in mice.
• Mice were assessed using the Novel Object Recognition task, Y-maze, and Elevated Plus maze.
• Behavioral and cognitive parameters were evaluated 6 weeks post-injury in mTBI mice housed in normal conditions versus those transitioned to an EE.

Main Results:

• Mice with mTBI housed in normal conditions showed significant cognitive and behavioral impairments compared to control and mTBI+EE groups.
• Transition to an EE significantly improved behavioral and cognitive outcomes in mTBI mice.
• No significant differences in recovery were observed between mTBI groups subjected to 30g or 50g impacts, nor between control and EE-only groups.

Conclusions:

• Enriched environments demonstrate significant positive effects on the recovery process of behaviors and cognitive functions in mice following mTBI.
• The severity of the mild TBI (30g vs. 50g) did not influence the positive rehabilitative effects of EE.
• Further research is warranted to elucidate the specific pathways mediating EE's benefits, with potential clinical implications for human TBI rehabilitation through adapted EE strategies.