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Roscovitine-treated HeLa cells finalize autophagy later than apoptosis by downregulating Bcl‑2.

Abstract：

:The cell cycle is tightly regulated by the family of cyclin-dependent kinases (CDKs). CDKs act as regulatory factors on serine and threonine residues by phosphorylating their substrates and cyclins. CDK‑targeting drugs have previously demonstrated promising effects as cancer therapeutics both in vitro and in vivo. Roscovitine, a purine‑derivative and specific CDK inhibitor, has been demonstrated to arrest the cell cycle and induce apoptosis in a number of different cancer cell lines, including HeLa cervical cancer cells. In the present study, roscovitine was able to decrease both the cell viability and cell survival as well as induce apoptosis in a dose‑dependent manner in HeLa cells by modulating the mitochondrial membrane potential. The decrease of anti‑apoptotic B-cell lymphoma 2 (Bcl‑2) and Bcl-2 extra large protein expression was accompanied by the increase in pro‑apoptotic Bcl-2-associated X protein and P53-upregulated modulator of apoptosis expression. The marked decrease in Bcl‑2 following exposure to roscovitine (20 µM) for 48 h prompted us to determine the autophagic regulation. The outcome revealed that roscovitine triggered Beclin‑1 downregulation and microtubule-associated light chain 3 cleavage starting from 12 h of incubation. Another biomarker of autophagy, p62, a crucial protein for autophagic vacuole formation, was diminished following 48 h. In addition, monodansyl cadaverin staining of autophagosomes also confirmed the autophagic regulation by roscovitine treatment. The expression levels of different Bcl‑2 family members determined whether apoptosis or autophagy were induced following incubation with roscovitine for different time periods. Downregulation of pro‑apoptotic Bcl‑2 family members indicated induction of apoptosis, while the downregulation of anti‑apoptotic Bcl‑2 family members rapidly induced autophagosome formation in HeLa cells.

journal_name

Mol Med Rep

journal_title

Molecular medicine reports

authors

Coker-Gurkan A,Arisan ED,Obakan P,Ozfiliz P,Kose B,Bickici G,Palavan-Unsal N

doi

10.3892/mmr.2014.2902

subject

Has Abstract

pub_date

2015-03-01 00:00:00

pages

1968-74

issue

eissn

1791-2997

issn

1791-3004

journal_volume

pub_type

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Roscovitine-treated HeLa cells finalize autophagy later than apoptosis by downregulating Bcl‑2.