摘要OBJECTIVE:To investigate the potential pharmacological mechanism of Danlou tablet(丹蒌片,DLT)with a long-term clinical application in the treatment of myocardial ischemia/reperfusion(I/R)injury through network pharmacology,molecular docking and experimental verification.METHODS:The main chemical ingredients in DLT were retrieved from the Traditional Chinese Medicine(TCM)System Pharmacology Database,the TCM information database,the bioinformatics analysis tool for molecular mechanism of TCM,and HERB database.Disease targets of I/R were accessed from the databases of Online Mendelian Inheritance in Man,GeneCards,Therapeutic Target Database,and DisGeNET database.The overlaying genes of DLT and I/R were obtained from the Venny online platform.The core targets and protein-protein interaction network were constructed and analyzed via the Search Tool for the Retrieval of Interacting Genes Proteins database and Cytoscape software.Furthermore,Gene Ontology(GO)analysis and Kyoto Encyclopedia of Genes and Genomes(KEGG)pathway enrichment analysis were performed by the Metascape platform.Based on the results,the component-target-pathway network was constructed and drafted via the Cytoscape software and the platform of Bioinformatics.Furthermore,we performed molecular docking to predict the binding information between chemical molecules and target proteins.Finally,oxygen-glucose deprivation/recovery(OGD/R)-induced H9c2 cardiomyocytes were used to validate the results of network pharmacology in vitro.RESULTS:A total of 189 active chemical components in DLT and 849 correlative targets of I/R were screened.Of note,133 overlaying genes found from the Venny online platform were concentrated into 28 core genes.Furthermore,the GO and KEGG pathway enrichment analysis presented that DLT might participate in 42 types of GO molecular functions,747 types of GO biological processes,19 types of GO cellular components,and 140 kinds of pathways to treat I/R.In the component-target-pathway network,the indirect relationship between herbs and their possible effective pathways was clarified.Based on the molecular docking,we speculated that Baicalein-prostaglandin G/H synthase 2(PTGS2)with-3.24 kcal/mol,Luteolin-heat shock protein 90 alpha family class A member 1(HSP90AA1)with-3.22 kcal/mol,Baicalein-HSP90AA1 with-3.13 kcal/mol,and Quercetin-HSP90AA1 with-3.05 kcal/mol possessed the strongest binding force of less than-3 kcal/mol,sequentially.Experimental verification showed that Quercetin,Luteolin,and Baicalein could increase the relative cell viability of OGD/R-stimulated cardiomyocytes,probably by suppressing PTGS2,and activating HSP90AA1 and estrogen receptor 1 expression.CONCLUSIONS:We predicted the potential active compounds as the material basis of DLT that may provide a new approach to elucidate the novel pharmacological mechanism underlying the treatment of cardiac I/R damage.