The Pivotal Role of PAO in CDK Inhibitors (Roscovitine and Purvalanol)- Triggered Apoptosis in PUMA Null HCT116 Colon Cancer Cells

The Pivotal Role of PAO in CDK Inhibitors (Roscovitine and Purvalanol)- Triggered Apoptosis in PUMA Null HCT116 Colon Cancer Cells

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Corresponding Author
Ajda Coker-Gurkan
Department of Molecular Biology and Genetics, Faculty of Engineering and Life Sciences, Topkapi Campus, Biruni University, Topkapi, Istanbul, Turkey


Background: Cycline-dependent kinase inhibitors (CDKi); roscovitine and purvalanol, are promising anti-cancer drugs due to their strong anti-proliferative effectiveness due to activation of PA catabolism. Besides transforming acetylated spermine and spermidine into spermidine and putrescine, respectively, polyamine oxidase (PAO) also generates hydrogen peroxide in high concentrations as a by-product. PAO was assumed as a pivotal key molecule during drug-induced apoptosis in cancer cells. Our aim is to reveal the role of PAO action in CDKi-triggered apoptosis in Puma knock-out HCT116 colon cancer cells. Methods: HCT116 wt and HCT116 Puma-/- cells were treated with Roscovitine and Purvalanol and cell viability and apoptosis were determined. Protein was isolated from treated and untreated cells and key molecules of cell cycle control and polyamine pathways were investigated at translational level. Polyamine content was determined by HPLC for all conditions. MDL-72527 was used as a PAO inhibitor and apoptotic cell death was analysed. Results: Roscovitine and purvalanol induced apoptosis and increased the cytotoxic responses in HCT116 wt and HCT116 Puma-/- colon carcinoma cell lines by modulating CDK1, 4, cyclin-B1, D3. Both, CDKi altered intrinsic apoptotic pathways in HCT116 wt. Whereas, drug-induced apoptosis occurred caspase-independent in Puma-/- colon cancer cells. Roscovitine and purvalanol up-regulated polyamine catabolic enzymes, whereas CDK inhibitors decreased the polyamine levels in HCT116 wt and HCT116 Puma-/- colon cancer cells. In addition, PAO inhibitor MDL72527 prevented drug-induced apoptosis. Conclusion: PAO expression profile might be a critical target in CDK inhibitors-triggered apoptosis in HCT116 colorectal cancer cells. Thus, MAPK signaling pathway relations with cell cycle and polyamine catabolic pathway investigations are in progress.

Article Info

Article Type
Research Article
Publication history
Received: Wed 07, Jul 2021
Accepted: Wed 21, Jul 2021
Published: Wed 04, Aug 2021
© 2023 Ajda Coker-Gurkan. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Hosting by Science Repository.
DOI: 10.31487/j.IJCST.2021.01.03