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Protection by puerarin against MPP+-induced neurotoxicity in PC12 cells mediated by inhibiting mitochondrial
Jiang Bo1, Bao Yong Ming, Li Zhi Gang
1School of Environmental and Biological Science and Technology, Dalian University of Technology, Dalian 116024, China. bojiang0411@yahoo.com.cn
Abstract:
Puerarin, a main isoflavone glycoside distributed in Pueraria lobata (Willd.) Ohwi, showed inhibitory activity on H2O2-induced PC12 cells damage in our previous work. However, there is insufficient evidence in protective mechanism of puerarin, especially that relating to the mitochondrial function. In this study, when cells were pretreated with puerarin prior to 0.4 mM MPP+, protective roles were accompanied by a reduction of cell viability loss, morphological changes of apoptosis and apoptotic rate. To explore the protective mechanism of puerarin in MPP+-induced PC12 cells, mitochondrial function and caspase-3-like activity were measured. The results indicated that puerarin inhibited the release of mitochondrial cytochrome c to cytosol and the loss of mitochondrial membrane potentials. In addition, puerarin also reduced MPP+-induced caspase-3-like activation. Taken together, the above results suggest that pretreatment of PC12 cells with puerarin could block MPP+-mediated apoptosis by mitochondria-dependent caspase cascade.
Insights
Puerarin protects PC12 cells from MPP+-induced damage by preserving mitochondrial function and inhibiting the caspase cascade, suggesting a role in neuroprotection.
Area of Science:
- Neuroscience
- Pharmacology
- Cell Biology
Background:
- Puerarin, an isoflavone from Pueraria lobata, previously showed protective effects against H2O2-induced PC12 cell damage.
- The precise neuroprotective mechanisms of puerarin, particularly concerning mitochondrial function, remain incompletely understood.
Purpose of the Study:
- To elucidate the protective mechanism of puerarin against MPP+-induced neurotoxicity in PC12 cells.
- To investigate the role of mitochondrial function and apoptosis pathways in puerarin's protective effects.
Main Methods:
- PC12 cells were pretreated with puerarin before exposure to MPP+.
- Assessed cell viability, apoptosis morphology, apoptotic rate, mitochondrial membrane potential, and cytochrome c release.
- Measured caspase-3-like activity to evaluate apoptosis activation.
Main Results:
- Puerarin pretreatment significantly reduced MPP+-induced loss of cell viability and apoptosis.
- Puerarin inhibited the release of mitochondrial cytochrome c and preserved mitochondrial membrane potential.
- Puerarin decreased MPP+-induced caspase-3-like activation.
Conclusions:
- Puerarin protects PC12 cells from MPP+-induced apoptosis through a mitochondria-dependent caspase cascade pathway.
- Puerarin's mechanism involves maintaining mitochondrial integrity and inhibiting key apoptotic enzymes.
- These findings highlight puerarin's potential as a therapeutic agent for neurodegenerative conditions involving mitochondrial dysfunction.
