Mitotic catastrophe and other cellular instability events in sodium valproate-treated HeLa cells
Valproic acid/sodium valproate (VPA) is a widely prescribed anticonvulsant and has also been used against certain tumor cells. It is a potent modulator of gene expression. Its ability to induce apoptosis has been well documented in HeLa cells. However, another form of cell death - mitotic catastrophe - has not yet been explored in VPA-treated HeLa cells. Here, we investigated the effects of VPA…
A recent study examines the effects of sodium valproate (VPA) on HeLa cells, focusing on a previously unstudied form of cell death called mitotic catastrophe. VPA is a widely used anticonvulsant and has been shown to modulate gene expression, including inducing apoptosis in HeLa cells. To investigate the impact of VPA on mitotic catastrophe, researchers analyzed the morphological features and frequencies of this phenomenon, as well as the fluorescence intensity signals of caspase-2 and p53, and the expression and abundance of DNMT1 and DNMT3B.
The results showed an increased frequency of mitotic catastrophe in VPA-treated HeLa cells, both visually and through enhanced induction of caspase-2 and involvement of p53. This effect was observed under more severe VPA treatment conditions. However, there was no decrease in DNMT1 or DNMT3B levels. Moreover, the increased mitotic catastrophe was accompanied by a reduction in mitotic chromosome abnormalities.
The study also found that enhanced DNMT3B expression following VPA action could be attributed to the drug-induced chromatin decondensation. This could potentially lead to increased CpG methylation of specific DNA sites, promoting oncosuppressive potential. In summary, VPA was found to trigger metabolic pathways linked to various forms of cell death in HeLa cells, supporting its potential as an oncogenic suppressor agent.
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