2. Academic Validation
  3. DITMD-induced mitotic defects and apoptosis in tumor cells by blocking the polo-box domain-dependent functions of polo-like kinase 1

DITMD-induced mitotic defects and apoptosis in tumor cells by blocking the polo-box domain-dependent functions of polo-like kinase 1

  • Eur J Pharmacol. 2019 Mar 15;847:113-122. doi: 10.1016/j.ejphar.2019.01.032.
Ka-Ul Kim 1,  Ju Hee Lee 2,  Mi Young Lee 2,  Chong Hak Chae 3,  Jeong Hyun Lee 1,  Byung Ho Lee 4,  Kwang-Seok Oh 5
Affiliations

Affiliations

  • 1 Bio-Organic Science Division, Korea Research Institute of Chemical Technology, 141 Gajeong-ro, Yuseong, Daejeon 34114, Republic of Korea; Department of Medicinal and Pharmaceutical Chemistry, University of Science and Technology, 176 Gajeong-ro, Yuseong, Daejeon 34129, Republic of Korea.
  • 2 Bio-Organic Science Division, Korea Research Institute of Chemical Technology, 141 Gajeong-ro, Yuseong, Daejeon 34114, Republic of Korea.
  • 3 Chemical simulation Center, Korea Research Institute of Chemical Technology, 141 Gajeong-ro, Yuseong, Daejeon 34114, Republic of Korea.
  • 4 Bio-Organic Science Division, Korea Research Institute of Chemical Technology, 141 Gajeong-ro, Yuseong, Daejeon 34114, Republic of Korea; Graduate School of New Drug Discovery and Development, Chungnam National University, 99 Daehak-ro, Yuseong, Daejeon 34183, Republic of Korea.
  • 5 Bio-Organic Science Division, Korea Research Institute of Chemical Technology, 141 Gajeong-ro, Yuseong, Daejeon 34114, Republic of Korea; Department of Medicinal and Pharmaceutical Chemistry, University of Science and Technology, 176 Gajeong-ro, Yuseong, Daejeon 34129, Republic of Korea. Electronic address: [email protected].
PMID: 30689997 DOI: 10.1016/j.ejphar.2019.01.032
Abstract

DITMD (1, 3- Dioxolo[4,5-g] isoquinolinium 5, 6, 7, 8- tetrahydro- 4- methoxy- 6, 6- dimethyl- 5- [2- oxo- 2- (2-pyridinyl)ethyl] - iodide) is a natural product-like compound with a hydrocotarnine moiety. The aim of this study was to investigate the Anticancer effects of DITMD including mitotic arrest, Apoptosis, radiosensitization, and to further explore its possible mechanism. DITMD (3-30 µM) induced an obvious cell cycle delay at G2/M transition and Apoptosis in HeLa cells. In a validation study, DITMD caused chromosome alignment defects and accumulation of mitotic markers such as polo-like kinase 1, cyclin B1, and phospho-histone H3. DITMD pre-treatment for 11 h also significantly decreased the cells' survival after X-ray irradiation. In mechanism studies, DITMD inhibited the polo-box domain of polo-like kinase 1 but not the conserved kinase domain. Molecular modeling also suggests that DITMD binds at the phosphate group recognition site and inhibits the action on phospho-peptide ligands. In addition, DITMD was analyzed as a PLHSpT competitive inhibitor with an IC50 value of 2.1 μM and exhibited good selectivity against 105 distinct kinases. Taken together, these results indicate that DITMD induced chromosome alignment defects, Apoptosis and radio-sensitization, and suggest that one mechanism underlying these Anticancer effects involves inhibiting the polo-box domain-dependent functions of polo-like kinase 1.

Keywords

Anticancer; DITMD; Polo-box domain; Polo-like kinase 1.

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