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Novel diosgenin derivatives containing 1,3,4-oxadiazole/thiadiazole moieties as potential antitumor agents: Design, synthesis and cytotoxic evaluation. 2020

Jinling Zhang, and Xuemei Wang, and Jifang Yang, and Lina Guo, and Xiaoli Wang, and Bo Song, and Wei Dong, and Wenbao Wang
College of Pharmacy, Qiqihar Medical University, Qiqihar, 161006, Heilongjiang, PR China.

Diosgenin, a naturally occurring steroidal saponin, has been confirmed to possess potent anticancer properties. In the current work, two series of novel diosgenin derivatives bearing 1,3,4-oxadiazole (6a-6e and 7a-7e) or 1,3,4-thiadiazole (8a-8e and 9a-9e) moieties were designed, synthesized and evaluated for their cytotoxicities in four human cancer cell lines (HepG2, A549, MCF-7 and HCT-116) and normal human gastric epithelial cells (GES-1) using the MTT assay in vitro. The results showed that compounds 8d and 9d exhibited significant cytotoxic activities against the HepG2 and A549 cells, being more potent than their parent compound diosgenin. Furthermore, the 1,3,4-thiadiazole series of compounds generally exhibited stronger cytotoxicity compared with the 1,3,4-oxadiazole series against HepG2 and A549 cells, and the substitution of 3-pyridyl group at the C5 position of the 1,3,4-thiadiazole ring was the preferred option for these compounds to display significant cytotoxic activities. Compound 8d showed potent cytotoxic activity against A549 cell line (IC50 = 3.93 μM) and was 6.7-fold more potent than diosgenin (IC50 = 26.41 μM). Moreover, compound 8d displayed low toxicity against GES-1 cells (IC50 = 420.4 μM), showing specificity between normal and tumor cells. Further cellular mechanism studies in A549 cells indicated that compound 8d triggered the mitochondrial-mediated apoptosis by decreasing mitochondrial membrane potential, which was associated with up-regulation of Bax, down-regulation of Bcl-2 and activation levels of the caspase cascade. The above results indicated that compound 8d may be used as a promising skeleton for antitumor agents with improved efficacy.

UI MeSH Term Description Entries
D010069 Oxadiazoles Compounds containing five-membered heteroaromatic rings containing two carbons, two nitrogens, and one oxygen atom which exist in various regioisomeric forms. Oxadiazole
D002478 Cells, Cultured Cells propagated in vitro in special media conducive to their growth. Cultured cells are used to study developmental, morphologic, metabolic, physiologic, and genetic processes, among others. Cultured Cells,Cell, Cultured,Cultured Cell
D004144 Diosgenin A spirostan found in DIOSCOREA and other plants. The 25S isomer is called yamogenin. Solasodine is a natural derivative formed by replacing the spiro-ring with a nitrogen, which can rearrange to SOLANINE.
D004305 Dose-Response Relationship, Drug The relationship between the dose of an administered drug and the response of the organism to the drug. Dose Response Relationship, Drug,Dose-Response Relationships, Drug,Drug Dose-Response Relationship,Drug Dose-Response Relationships,Relationship, Drug Dose-Response,Relationships, Drug Dose-Response
D004354 Drug Screening Assays, Antitumor Methods of investigating the effectiveness of anticancer cytotoxic drugs and biologic inhibitors. These include in vitro cell-kill models and cytostatic dye exclusion tests as well as in vivo measurement of tumor growth parameters in laboratory animals. Anticancer Drug Sensitivity Tests,Antitumor Drug Screens,Cancer Drug Tests,Drug Screening Tests, Tumor-Specific,Dye Exclusion Assays, Antitumor,Anti-Cancer Drug Screens,Antitumor Drug Screening Assays,Tumor-Specific Drug Screening Tests,Anti Cancer Drug Screens,Anti-Cancer Drug Screen,Antitumor Drug Screen,Cancer Drug Test,Drug Screen, Anti-Cancer,Drug Screen, Antitumor,Drug Screening Tests, Tumor Specific,Drug Screens, Anti-Cancer,Drug Screens, Antitumor,Drug Test, Cancer,Drug Tests, Cancer,Screen, Anti-Cancer Drug,Screen, Antitumor Drug,Screens, Anti-Cancer Drug,Screens, Antitumor Drug,Test, Cancer Drug,Tests, Cancer Drug,Tumor Specific Drug Screening Tests
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000970 Antineoplastic Agents Substances that inhibit or prevent the proliferation of NEOPLASMS. Anticancer Agent,Antineoplastic,Antineoplastic Agent,Antineoplastic Drug,Antitumor Agent,Antitumor Drug,Cancer Chemotherapy Agent,Cancer Chemotherapy Drug,Anticancer Agents,Antineoplastic Drugs,Antineoplastics,Antitumor Agents,Antitumor Drugs,Cancer Chemotherapy Agents,Cancer Chemotherapy Drugs,Chemotherapeutic Anticancer Agents,Chemotherapeutic Anticancer Drug,Agent, Anticancer,Agent, Antineoplastic,Agent, Antitumor,Agent, Cancer Chemotherapy,Agents, Anticancer,Agents, Antineoplastic,Agents, Antitumor,Agents, Cancer Chemotherapy,Agents, Chemotherapeutic Anticancer,Chemotherapy Agent, Cancer,Chemotherapy Agents, Cancer,Chemotherapy Drug, Cancer,Chemotherapy Drugs, Cancer,Drug, Antineoplastic,Drug, Antitumor,Drug, Cancer Chemotherapy,Drug, Chemotherapeutic Anticancer,Drugs, Antineoplastic,Drugs, Antitumor,Drugs, Cancer Chemotherapy
D013329 Structure-Activity Relationship The relationship between the chemical structure of a compound and its biological or pharmacological activity. Compounds are often classed together because they have structural characteristics in common including shape, size, stereochemical arrangement, and distribution of functional groups. Relationship, Structure-Activity,Relationships, Structure-Activity,Structure Activity Relationship,Structure-Activity Relationships
D013830 Thiadiazoles Heterocyclic compounds composed of a five-membered heterocyclic ring which contains one sulfur and two nitrogen atoms. Thiadiazole
D015195 Drug Design The molecular designing of drugs for specific purposes (such as DNA-binding, enzyme inhibition, anti-cancer efficacy, etc.) based on knowledge of molecular properties such as activity of functional groups, molecular geometry, and electronic structure, and also on information cataloged on analogous molecules. Drug design is generally computer-assisted molecular modeling and does not include PHARMACOKINETICS, dosage analysis, or drug administration analysis. Computer-Aided Drug Design,Computerized Drug Design,Drug Modeling,Pharmaceutical Design,Computer Aided Drug Design,Computer-Aided Drug Designs,Computerized Drug Designs,Design, Pharmaceutical,Drug Design, Computer-Aided,Drug Design, Computerized,Drug Designs,Drug Modelings,Pharmaceutical Designs

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