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Updated: Feb 26, 2026
Controlled Cortical Impact Model for Traumatic Brain Injury
Published on: August 5, 2014
Suppression of cortical TRPM7 protein attenuates oxidative damage after traumatic brain injury via Akt/endothelial
Hong-Liang Xu1, Meng-Dong Liu2, Xiao-Hong Yuan1
1Department of Anesthesiology, Zhejiang Cancer Hospital, Hangzhou, Zhejiang, 310022, China.
Abstract:
Neuronal death after traumatic brain injury (TBI) is a complex process resulting from a combination of factors, many of which are still unknown. Transient receptor potential melastatin 7 (TRPM7) is a transient receptor potential channel that has been demonstrated to mediate ischemic and traumatic neuronal injury in vitro. In the present study, TRPM7 was suppressed in the rat cerebral cortex by intracortical injections of viral vectors bearing shRNA specific for TRPM7 to investigate its potential role in an in vivo TBI model. We found that TRPM7 suppression significantly reduced brain edema, brain contusion volume and motor functional deficits, which was sustained for at least 2 weeks after the insult. These protective effects were accompanied by inhibited apoptosis in injured cortex. Also, TRPM7 suppression attenuated lipid peroxidation, decreased the expression of protein carbonyl, and preserved the endogenous antioxidant enzyme activities. The results of western blot analysis showed that TRPM7 suppression markedly increased the phosphorylation of Akt and endothelial nitric oxide synthase (eNOS). In addition, blocking Akt/eNOS pathway activation by the specific inhibitor LY294002 (LY, 10 μL, 10 mmol/L) or L-NIO (0.5 mg/kg) partially reversed the protective effects of TRPM7 suppression and its anti-oxidative activities. Taken together, these findings demonstrated that regional inhibition of TRPM7 in cerebral cortex exerts neuroprotective effects against TBI through activation of Akt/eNOS pathway. Thus, TRPM7 might represent a potential drug development target for the treatment of TBI.
Insights
Suppressing the TRPM7 channel in rats significantly reduced brain damage and motor deficits after traumatic brain injury (TBI). This neuroprotection involved activating the Akt/eNOS pathway, suggesting TRPM7 as a potential TBI drug target.
Area of Science:
- Neuroscience
- Molecular Biology
- Trauma Research
Background:
- Traumatic brain injury (TBI) causes complex neuronal death.
- Transient receptor potential melastatin 7 (TRPM7) channels are implicated in neuronal injury.
- TRPM7's role in in vivo TBI models requires further investigation.
Purpose of the Study:
- To investigate the neuroprotective effects of TRPM7 suppression in a rat TBI model.
- To elucidate the molecular mechanisms underlying TRPM7's role in TBI.
- To assess TRPM7 as a potential therapeutic target for TBI.
Main Methods:
- TRPM7 was suppressed in rat cerebral cortex using shRNA-bearing viral vectors.
- TBI was induced, and outcomes including brain edema, contusion volume, and motor function were assessed.
- Apoptosis, oxidative stress markers, and the Akt/eNOS pathway were analyzed via western blot and biochemical assays.
Main Results:
- TRPM7 suppression significantly reduced brain edema, contusion volume, and motor deficits for at least 2 weeks post-TBI.
- Suppression of TRPM7 inhibited apoptosis and oxidative stress in the injured cortex.
- TRPM7 inhibition increased Akt and eNOS phosphorylation, with partial reversal of protective effects upon pathway blockade.
Conclusions:
- Regional TRPM7 inhibition in the cerebral cortex provides neuroprotection against TBI.
- The Akt/eNOS pathway activation mediates the protective effects of TRPM7 suppression.
- TRPM7 inhibition represents a promising therapeutic strategy for TBI treatment.
