A strategy for optimization and cardioprotective validation by combination of three compounds based on Chinese medicinal formula Sheng‐Mai‐San for myocardial ischemia
Authors: Li Fang , Fan Xiaoxue , Zhang Yu , Kou Junping , Yu Boyang 
Published: April 2020

Background/Aims

Traditional Chinese medicine has been used in clinical practice for thousands of years and has accumulated considerable knowledge concerning the in vivo efficacy of targeting complicated diseases. TCM formulae are a mixture of hundreds of chemical components with multiple potential targets, essentially acting as a combination therapy of multi‐component drugs. However, the obscure substances and the unclear molecular mechanisms are obstacles to their further development and internationalization.

Methods

We chose three representative components (ginsenoside Rb1 (G), ruscogenin (R) and schisandrin (S)) for the optimization design studies. First, the proper proportion of the combination was explored in different myocardial ischemia mice induced by isoproterenol and pituitrin based on orthogonal design. Then, the different proportion combinations were further optimized through uniform design in a multi‐model and multi‐index mode. Finally, the protective effect of combination was verified in three models of myocardial ischemia injured by ischemia/reperfusion, chronic intermittent hypoxia and acute infarction.

Results

The optimized combination GRS (G: 6 mg/kg, R: 0.75 mg/kg, S: 6 mg/kg) obtained by experimental screening exhibited a significant protective effect on myocardial ischemia injury, as evidenced by decreased myocardium infarct size, ameliorated histological features, decreased myocardial myeloperoxidase and malondiadehyde, calcium overload, and decreased serum lactate dehydrogenase, creatine kinase MB isoenzyme, cardiac troponin I activity. In addition, the interactions of three components in combination GRS were also investigated. The combination, compared to G, R and S, could significantly reduce the concentration of serum CK‐MB and cTn‐I, and decrease myocardial infarct size, which demonstrated the advantages of this combination for myocardial ischemia. Mechanistically, GRS alleviated myocardial apoptosis by inhibiting the mitochondrial mediated apoptosis pathway as reflected by inhibition of caspase‐3 activity, normalization of Bcl‐2/Bax levels and improved mitochondrial function. Moreover, GRS prevented cardiomyocytes mitochondrial fission and upregulated AMPKα phosphorylation. Interestingly, AMPK activation prevented hypoxia and reoxygenation induced mitochondrial fission in cardiomyocytes and GRS actions were significantly attenuated by knockdown of AMPKα.

Conclusion

Our results demonstrated that the optimized combination GRS could exert significant cardioprotection against myocardial ischemia injury with similar effect compared to Sheng Mai preparations, which might provide some pharmacological evidences for further development of new modern Chinese drug for cardiovascular diseases basing on traditional Chinese formula with affirmative therapeutic effect.

Support or Funding Information

This research work was supported by the National Natural Science Foundation of China (No. 81603328, No. 81573719), Natural Science Foundation of Jiangsu Province (BK20160761), Project funded by China Postdoctoral Science Foundation (2016M600456, 2017T100425).

This abstract is from the Experimental Biology 2019 Meeting. There is no full text article associated with this abstract published in The FASEB Journal.