Investigation of anticancer mechanism of thiadiazole-based compound in human non-small cell lung cancer A549 cells

Jui Yi Chou, Shin Yu Lai, Shiow Lin Pan, Guey Mei Jow, Ji Wang Chern, Jih Hwa Guh

Research output: Contribution to journalArticlepeer-review

142 Citations (Scopus)


In this study, we have synthesized several compounds and examined their cytotoxic effects on human non-small cell lung cancer A549 cells. We found that GO-13 ((E,E)-2,5-bis[4-(3-dimethyl-aminopropoxy)styryl]-1,3,4-thiadiazole) is the most effective one by the MTT assay. Furthermore, the GO-13-induced apoptotic reaction was identified based on several criteria, such as negative release reaction of lactate dehydrogenase and positive labeling of annexin V and terminal deoxynucleotidyl transferase dUTP nick-end labeling (TUNEL) techniques. GO-13 induced the apoptosis in A549 cells in a concentration- and time-dependent manner. The data demonstrate that the regulations of p38 mitogen-activated protein kinase and protein kinase C was not involved in the GO-13-mediated mechanism. However, GO-13 significantly induced a down-regulation of Bcl-XL expression in a short-term treatment (less than 3hr), whereas stimulated up-regulation of Bax expression in a long-term treatment (24hr) indicating their involvement in GO-13 action. GO-13-mediated apoptosis is also positively correlated with the increase in caspase-3 activity. Worth noting is the fact that GO-13 did not modify the phosphorylation level of Akt/protein kinase B (PKB) until a 24-hr exposure was carried out indicating that the inhibition of Akt/PKB activation was involved in the late-phase apoptosis. Besides the anticancer activity, GO-13 also showed equivalent anti-angiogenic activity in the nude mice angiogenesis model. In summary, we conclude that GO-13 is the most effective anticancer compound in our screening tests. It induced the early-phase apoptosis in A549 cells via the Bcl-XL down-regulation, and that of the late-phase through up-regulation of Bax expression as well as inhibition of Akt/PKB activation.

Original languageEnglish
Pages (from-to)115-124
Number of pages10
JournalBiochemical Pharmacology
Issue number1
Publication statusPublished - Jul 1 2003
Externally publishedYes


  • Apoptosis
  • Bax
  • Bcl-X
  • Phosphoinositide 3-kinase
  • Thiadiazole

ASJC Scopus subject areas

  • Pharmacology


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