METHODS

We subjected 100 male C57BL mice to a closed-skull cortical-controlled impact injury. Two hours after the TBI, the animals were allocated to either the RIC group (n= 50) or the sham group (n= 50). By clamping the exposed femoral artery, we induced RIC by six 4-minute cycles of ischemia and reperfusion. Circulating levels of S100-B, neuron-specific enolase, and glial fibrillary acidic protein were measured at multiple time points. Animals were additionally observed daily for cognition and motor coordination via novel object recognition and rotarod. Brain sections were stained and evaluated for neuronal injury at post-TBI Day 5.

RESULTS

The RIC animals had a significantly higher recognition index than did sham at 24, 48, and 72 hours after intervention. Rotarod latency was higher in the RIC animals compared to the sham animals at all-time points, and statistically significant at 120 hours after intervention. The RIC group demonstrated preserved cognitive function and motor coordination compared to the sham. On hematoxylin and eosin and immunohistochemical staining of brain sections, there was less area of neuronal degeneration and astrocytosis, respectively, in the RIC group compared to the sham group. There was no significant difference in systemic neuronal markers between the RIC and sham animals.

CONCLUSION

Remote ischemic conditioning 2 hours after injury preserved cognitive functions and motor coordination in a mouse model of TBI. Remote ischemic conditioning can preserve viability of neurons and astrocytes after TBI and has potential as a clinically noninvasive and relatively easy method to improve outcome after TBI.