Proteomics based discovery of Salvia miltiorrhiza Bunge treating Parkinson's disease through the PINK1/Parkin pathway.

ETHNOPHARMACOLOGICAL RELEVANCE: Salvia miltiorrhiza Bunge, a traditional Chinese medicine, has been utilized in the treatment of Parkinson's disease (PD) for thousands of years, as evidenced by its inclusion in ancient formulas such as YangXue XingNao Tang and XingGan ZhenFeng Tang. However, the underlying mechanisms of its therapeutic effects on PD remain unclear.

AIM OF THE STUDY: This study aims to evaluate the therapeutic effects of Salvia miltiorrhiza Bunge on a rotenone-induced PD rat model and elucidate its mechanism of action.

METHODS

To explore the efficacy of Salvia miltiorrhiza Bunge extract (SME) in PD, we employed both in vitro and in vivo models using rotenone-induced PC12 cells and rats. Therapeutic effects were assessed through cell viability assays, behavioral tests, and immunohistochemistry. Proteomic analysis and molecular docking experiments were conducted to identify the pathways involved in SME's effects. Immunofluorescence and Western blotting were used to validate the role of mitophagy, while transmission electron microscopy (TEM) provided direct evidence of mitophagy induction by SME.

RESULTS

Salvia miltiorrhiza Bunge significantly improved motor dysfunction and mitigated dopaminergic neuron degeneration in the substantia nigra of rotenone-exposed rats. Proteomic analysis revealed significant activation of the PINK1/Parkin pathway following SME treatment. Furthermore, molecular experiments confirmed that SME induces mitophagy, which protects PC12 cells from rotenone-induced damage.

CONCLUSION

This study demonstrates the therapeutic efficacy of Salvia miltiorrhiza Bunge in mitigating PD-related pathologies. Through proteomic and molecular analyses, we identified SME's ability to activate the PINK1/Parkin pathway and promote mitophagy, offering new insights into its mechanism of action in PD.