title: Antitumor activity of a 2-pyridinecarboxaldehyde 2-pyridinecarboxylic acid hydrazone copper complex and the related mechanism.
abstract: In the present study, 2-pyridinecarboxaldehyde 2-pyridinecarboxylic acid hydrazone (PPAH) was prepared and its antitumor activity was evaluated. The inhibition of proliferation of PPAH against the HepG2 and HCT-116 cell lines was less effective, yet in the presence of copper ions, the mixture demonstrated excellent antitumor activity (IC50 at 2.75±0.30 µM for the HepG2 cell line, and 1.90±0.20 µM for the HCT-116 cell line, respectively) and the new active species was confirmed to be a PPAH copper complex with a 1:1 ratio by spectral analysis. The excellent antitumor activity of the copper complex prompted us to investigate the underlying mechanism. RT-PCR was performed to detect the changes in the expression of apoptotic genes induced by PPAH and its copper complex. However, no changes were observed when the cells were treated by the agents for 24 or 48 h, indicating that ROS were unlikely involved. Cell cycle analysis showed that both PPAH and its copper complex led to S phase arrest of the cells. The sDNA relaxation assay revealed that the PPAH-copper complex displayed dual topoisomerase inhibition for type I and II. The data suggest that the inhibition of proliferation exhibited by the PPAH copper complex may stem from its dual topoisomerase inhibition, which is rarely observed for a metal complex.
authors.affiliation: Department of Molecular Biology and Biochemistry, Xinxiang Medical University, Xinxiang, Henan, P.R. China.
authors.forename: Yingli
authors.initials: Y
authors.lastname: Yang
authors.affiliation: Department of Molecular Biology and Biochemistry, Xinxiang Medical University, Xinxiang, Henan, P.R. China.
authors.forename: Tengfei
authors.initials: T
authors.lastname: Huang
authors.affiliation: Clinical Skill Training Center, Xinxiang Medical University, Xinxiang, Henan, P.R. China.
authors.forename: Sufeng
authors.initials: S
authors.lastname: Zhou
authors.affiliation: Department of Molecular Biology and Biochemistry, Xinxiang Medical University, Xinxiang, Henan, P.R. China.
authors.forename: Yun
authors.initials: Y
authors.lastname: Fu
authors.affiliation: Department of Molecular Biology and Biochemistry, Xinxiang Medical University, Xinxiang, Henan, P.R. China.
authors.forename: Youxun
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Department of Surgery, The Third Affiliated Hospital of Xinxiang Medical University, Xinxiang, Henan, P.R. China.
authors.forename: Yanbin
authors.initials: Y
authors.lastname: Yuan
authors.affiliation: Department of Molecular Biology and Biochemistry, Xinxiang Medical University, Xinxiang, Henan, P.R. China.
authors.forename: Qiongqing
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: Department of Surgery, The Third Affiliated Hospital of Xinxiang Medical University, Xinxiang, Henan, P.R. China.
authors.forename: Shaoshan
authors.initials: S
authors.lastname: Li
authors.affiliation: Department of Molecular Biology and Biochemistry, Xinxiang Medical University, Xinxiang, Henan, P.R. China.
authors.forename: Changzheng
authors.initials: C
authors.lastname: Li
mesh_terms: D017209:Apoptosis / Q000187:drug effects; D059447:Cell Cycle Checkpoints / Q000187:drug effects; D049109:Cell Proliferation / Q000187:drug effects*; D003300:Copper / Q000008:administration & dosage* / Q000737:chemistry; D004354:Drug Screening Assays, Antitumor; D045325:HCT116 Cells; D056945:Hep G2 Cells; D006801:Humans; D006835:Hydrazones / Q000008:administration & dosage* / Q000138:chemical synthesis; D009369:Neoplasms / Q000188:drug therapy* / Q000473:pathology; D011725:Pyridines / Q000008:administration & dosage / Q000138:chemical synthesis
chemical_list: D006835:Hydrazones; D011725:Pyridines; C051439:pyridinecarboxaldehyde; D003300:Copper