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Combined Treatment of ATRA with Epigenetic Drugs Increases Aggressiveness of Glioma Xenografts. | LitMetric

AI Article Synopsis

Article Abstract

Background/aim: Recently, anti-tumourigenic effects of all-trans-retinoic-acid (ATRA) on glioblastoma stem cells were demonstrated. Therefore we investigated if these beneficial effects could be enhanced by co-medication with epigenetic drugs such as the histone deacetylase (HDAC) inhibitor suberoylanilide hydroxamic acid (SAHA) or the DNA-methyltransferase inhibitor 5-aza-2'deoxycytidine (5-AZA).

Materials And Methods: Glioma stem cell xenografts were treated for 42 days with ATRA plus SAHA or ATRA plus 5-AZA or the correspondent monotherapies. Tumour sizes, histological features, proliferation and apoptosis rates were assessed.

Results: Neither SAHA nor 5-AZA were able to enhance the anti-tumourigenic effect of ATRA. Instead, tumours became more aggressive. Combination of ATRA plus 5-AZA increased tumour size (p<0.05) and induced more frequent and larger necroses (p<0.05) and tumours were more invasive (p<0.05) in comparison to controls. A similar trend was observed for the combination of ATRA plus SAHA.

Conclusion: Combining ATRA with epigenetic drug therapies led to the unwanted opposite effect and increased aggressiveness of glioma xenografts, arguing against future clinical applications of such combinations.

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