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Stabilization of mitochondrial function by tetramethylpyrazine protects against kainate-induced oxidative lesions in
Shu-Yan Li1, Yu-Hong Jia, Wen-Ge Sun
1Department of Biochemistry and Molecular Biology, Peking University Health Science Center, Beijing 100191, People's Republic of China. shuyanli@bjmu.edu.cn
Abstract:
Mitochondria are critical regulators of cell death, a key feature of neurodegeneration. Reactive oxygen species (ROS) are crucial to Ca(2+)-mediated effects of glutamate receptor activation leading to neuronal degeneration. Tetramethylpyrazine (TMP) is a principal ingredient of Ligusticum wallichi Franchat (a Chinese herb), used for treatment of cardiovascular and cerebrovascular ischemic diseases. However, its protection against oxidative brain injury associated with excessive activation of glutamate receptors is unknown. In this study, we demonstrate TMP neuroprotection against kainate-induced excitotoxicity in vitro and in vivo. We found that TMP could partly alleviate kainate-induced status epilepticus in rats and prevented and rescued neuronal loss in the hippocampal CA3 but not the CA1 region. The partial prevention and rescue of neuronal loss by TMP were attributable to the preservation of the structural and functional integrity of mitochondria, evidenced by maintaining the mitochondrial membrane potential, ATP production, and complex I and III activities. Stabilization of mitochondrial function was linked to the observation that TMP could function as a reductant/antioxidant to quench ROS, block lipid peroxidation, and protect enzymatic antioxidants such as glutathione peroxidase and glutathione reductase. These results suggest that TMP may protect against oxidative brain injury by stabilization of mitochondrial function through quenching of ROS.
Insights
Tetramethylpyrazine (TMP) protects brain cells from oxidative damage by preserving mitochondrial function. This study shows TMP reduces neuronal loss and seizures caused by excitotoxicity, highlighting its potential for treating brain injury.
Area of Science:
- Neuroscience
- Mitochondrial Biology
- Pharmacology
Background:
- Mitochondria are key in neurodegeneration and cell death.
- Reactive oxygen species (ROS) contribute to excitotoxicity and neuronal damage.
- Tetramethylpyrazine (TMP), from Ligusticum wallichi, treats vascular diseases, but its neuroprotective role is unclear.
Purpose of the Study:
- To investigate the neuroprotective effects of TMP against oxidative brain injury.
- To determine if TMP protects against excitotoxicity mediated by glutamate receptors.
Main Methods:
- In vitro and in vivo models of kainate-induced excitotoxicity.
- Assessment of neuronal loss, status epilepticus, mitochondrial membrane potential, ATP production, and enzyme activities.
- Evaluation of ROS quenching and antioxidant protection by TMP.
Main Results:
- TMP partially alleviated kainate-induced status epilepticus in rats.
- TMP prevented and rescued neuronal loss in the hippocampal CA3 region.
- TMP preserved mitochondrial function by maintaining membrane potential, ATP production, and enzyme activities.
- TMP acted as an antioxidant, quenching ROS and protecting endogenous antioxidants.
Conclusions:
- TMP demonstrates neuroprotection against excitotoxicity and associated oxidative brain injury.
- TMP stabilizes mitochondrial function, likely through ROS quenching and antioxidant effects.
- TMP shows therapeutic potential for conditions involving oxidative stress and neurodegeneration.
