4t-CHQ a Spiro-Quinazolinone Benzenesulfonamide Derivative Induces G0/G1 Cell Cycle arrest and Triggers Apoptosis Through Down-Regulation of Survivin and Bcl2 in the Leukemia Stem-Like KG1-a Cells

Author(s): Arezoo Rahimian, Majid Mahdavi*, Reza Rahbarghazi, Hojjatollah N. Charoudeh.

Journal Name: Anti-Cancer Agents in Medicinal Chemistry
(Formerly Current Medicinal Chemistry - Anti-Cancer Agents)

Volume 19 , Issue 11 , 2019

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Abstract:

Objective: Many experiments have revealed the anti-tumor activity of spiro-quinazolinone derivatives on different cell types. Exposing KG1-a cells to N-(4- tert- butyl- 4'- oxo- 1'H- spiro [cyclohexane- 1, 2'- quinazoline]- 3'(4'H)- yl)- 4- methyl benzenesulfonamide (4t-CHQ), as an active sub-component of spiroquinazolinone benzenesulfonamides, the experiment investigated the possible mechanisms that manifest the role of 4t-CHQ in leukemic KG1-a progenitor cells. Mechanistically, the inhibitory effects of 4t-CHQ on KG1-a cells emerge from its modulating function on the expression of Bax/Bcl2 and survinin proteins.

Methods: Cell viability was assessed using MTT assay. The IC50 value of cells was calculated to be 131.3μM, after 72h-incubation with 4t-CHQ, ranging from 10 to 150μM. Apoptotic changes were studied using Acridine Orange/Ethidium Bromide (AO/EB) staining. DNA fragmentation was analyzed by agarose gel electrophoresis method. To evaluate the percentage of apoptotic cells and cell growth dynamic apoptotic features, we performed Annexin V/PI double staining assay and cell cycle analysis by flow cytometry.

Results: According to the results, apoptosis induction was initiated by 4t-CHQ in the KG1-a cells (at IC50 value). Cell dynamic analysis revealed that the cell cycle at the G1 phase was arrested after treatment with 4t- CHQ. Western blotting analysis showed enhancement in the expression ratio of Bax/Bcl-2, while the expression of survinin protein decreased in a time-dependent manner in the KG1-a cells. According to the docking simulation data, the effectiveness of 4t-CHQ on KG1-a cells commenced by its reactions with the functional domain of BH3 and Bcl2 and BIR domains of survivin protein.

Conclusion: These results demonstrate a remarkable role of 4t- CHQ in arresting leukemia KG1-a stem cells both by induction of apoptosis as well as by down-regulating survivin and Bcl2 proteins.

Keywords: Apoptosis, spiro-quinazolinone, Bcl2, survivin, KG1-a cell, leukemia.

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Article Details

VOLUME: 19
ISSUE: 11
Year: 2019
Page: [1340 - 1349]
Pages: 10
DOI: 10.2174/1871520619666190313165130
Price: $58

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