title: Synthesis and Biological Evaluation of Novel 1,3,4-thiadiazole Derivatives Incorporating Benzisoselenazolone Scaffold as Potential Antitumor Agents.
abstract: BACKGROUND
  Based on the biological significance of benzisoselenazolone and 1,3,4-thiadiazole, a series of novel 1,3,4-thiadiazole derivatives incorporating benzisoselenazolone scaffold were designed and synthesized with ebselen as a lead compound.
  
  
  METHODS
  Meanwhile, their in vitro antitumor activities were evaluated against SMMC-7721, MCF-7 and A549 human cancer cell lines by CCK-8 assay.
  
  
  RESULTS
  The preliminary bioassay results demonstrated that all tested compounds 4a-q showed potent antitumor activities, and some compounds exhibited better effects than positive control ethaselen and 5-fluorouracil (5-FU) against various cancer cell lines. Furthermore, compounds 4b and 4m showed significant antitumor activities against SMMC-7721 cells with IC50 values of 1.89 and 1.89 μM, respectively. Compounds 4c and 4n displayed highly effective biological activities against MCF-7 cells with IC50 values of 2.88 and 2.28 μM, respectively. Compound 4i showed the best inhibitory effect against A549 cells with IC50 value of 1.76 μM.
  
  
  CONCLUSIONS
  The pharmacological results suggest that the substituent groups of phenyl ring on the 1,3,4-thiadiazole are vital for modulating antitumor activities against various cancer cell lines.
authors.forename: Xiaoyun
authors.initials: X
authors.lastname: Fu
authors.forename: Sha
authors.initials: S
authors.lastname: Li
authors.forename: Fen
authors.initials: F
authors.lastname: Jing
authors.forename: Xuefeng
authors.initials: X
authors.lastname: Wang
authors.forename: Baolin
authors.initials: B
authors.lastname: Li
authors.forename: Jijun
authors.initials: J
authors.lastname: Zhao
authors.forename: Yuming
authors.initials: Y
authors.lastname: Liu
authors.affiliation: School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, China. chenbaoquan66@126.com.
authors.forename: Baoquan
authors.initials: B
authors.lastname: Chen
mesh_terms: D000970:Antineoplastic Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D001393:Azoles / Q000494:pharmacology; D045744:Cell Line, Tumor; D004354:Drug Screening Assays, Antitumor; D005472:Fluorouracil / Q000494:pharmacology; D006801:Humans; D054833:Isoindoles; D016566:Organoselenium Compounds / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D013329:Structure-Activity Relationship; D013830:Thiadiazoles / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*
chemical_list: D000970:Antineoplastic Agents; D001393:Azoles; D054833:Isoindoles; D016566:Organoselenium Compounds; D013830:Thiadiazoles; C042986:ebselen; D005472:Fluorouracil