Upregulation of Stat1-HDAC4 confers resistance to etoposide through enhanced multidrug resistance 1 expression in human A549 lung cancer cells
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Post-publication record
- Nature
- Retraction
- Reason
- Concerns/Issues about Data;Duplication of Data;Euphemisms for Duplication;Investigation by Journal/Publisher;Investigation by Third Party;Unreliable Data;
- Date
- 2/17/2025 0:00
- Flagged by OpenAlex?
- Yes
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Abstract
Despite efforts to develop efficient chemotherapeutic drug strategies to treat cancer, acquired drug resistance is a commonly encountered problem. In the present study, to investigate this phenomenon, human A549 lung cancer cells resistant to the topoisomerase inhibitor etoposide (A549RT‑eto) were used and compared with A549 parental cells. A549RT‑eto cells demonstrated increased resistance to etoposide‑induced apoptosis when compared with A549 parental cells. Notably, A549RT‑eto cells were observed to exhibit greater levels of histone deacetylase 4 (HDAC4), phospho‑Stat1 and P‑glycoprotein [P‑gp; encoded by the multidrug resistance 1 (MDR1) gene], compared with A549 cells. To address whether HDAC4 protein is involved in etoposide resistance in A549 cells, A549RT‑eto cells were treated with trichostatin A (TSA; an HDAC inhibitor) during etoposide treatment. The combined treatment was demonstrated to enhance etoposide‑induced apoptosis and reduce expression levels of HDAC4, P‑gp and phospho‑Stat1. In addition, the suppression of Stat1 with siRNA enhanced etoposide‑induced apoptosis and reduced the expression levels of HDAC4 and P‑gp, suggesting that Stat1 is essential in the regulation of resistance to etoposide, and in the upregulation of P‑gp. Notably, TSA treatment reduced P‑gp transcript levels but Stat1 siRNA treatment did not, suggesting that P‑gp is regulated by HDAC at the transcriptional level and by Stat1 at the post‑transcriptional level. These results suggest that the upregulation of Stat1 and HDAC4 determines etoposide resistance through P‑gp expression in human A549 lung cancer cells.
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The record
- Venue
- Molecular Medicine Reports
- Topic
- Histone Deacetylase Inhibitors Research
- Field
- Biochemistry, Genetics and Molecular Biology
- Canadian institutions
- University of Calgary
- Funders
- Division of ChemistryOffice of the Higher Education CommissionNational Research Foundation
- Keywords
- EtoposideTrichostatin AA549 cellCancer researchDownregulation and upregulationClusterinHDAC4ApoptosisBiologyLung cancerCancer cellMultiple drug resistanceArsenic trioxideHistone deacetylaseCancerMedicineDrug resistanceChemotherapyInternal medicineHistoneBiochemistryMicrobiologyGeneticsGene
- Has abstract in OpenAlex
- yes