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Title: Ethanol enhances hyperthermia‐induced cell death in human leukemia cells
Authors: Quintana, Mercedes
Saavedra Díaz, Ester Gloria 
Del Rosario García, Henoc 
González, Ignacio
Hernández González, Inmaculada Servanda 
Estévez Rosas, Francisco Jesús 
Quintana Aguiar, José Martín 
UNESCO Clasification: 32 Ciencias médicas
241003 Citología humana
2302 Bioquímica
Keywords: Ethanol
Leukemia cells
Issue Date: 2021
Project: Evaluación de Endemismos Canarios Como Fuente de Biomoléculas de Interés Medico 
Journal: International Journal of Molecular Sciences 
Abstract: Ethanol has been shown to exhibit therapeutic properties as an ablative agent alone and in combination with thermal ablation. Ethanol may also increase sensitivity of cancer cells to certain physical and chemical antitumoral agents. The aim of our study was to assess the potential influence of nontoxic concentrations of ethanol on hyperthermia therapy, an antitumoral modality that is continuously growing and that can be combined with classical chemotherapy and radiotherapy to improve their efficiency. Human leukemia cells were included as a model in the study. The results indicated that ethanol augments the cytotoxicity of hyperthermia against U937 and HL60 cells. The therapeutic benefit of the hyperthermia/ethanol combination was associated with an increase in the percentage of apoptotic cells and activation of caspases-3, -8 and -9. Apoptosis triggered either by hyperthermia or hyperthermia/ethanol was almost completely abolished by a caspase-8 specific inhibitor, indicating that this caspase plays a main role in both conditions. The role of caspase-9 in hyperthermia treated cells acquired significance whether ethanol was present during hyperthermia since the alcohol enhanced Bid cleavage, translocation of Bax from cytosol to mitochondria, release of mitochondrial apoptogenic factors, and decreased of the levels of the anti-apoptotic factor myeloid cell leukemia-1 (Mcl-1). The enhancement effect of ethanol on hyperthermia-activated cell death was associated with a reduction in the expression of HSP70, a protein known to interfere in the activation of apoptosis at different stages. Collectively, our findings suggest that ethanol could be useful as an adjuvant in hyperthermia therapy for cancer.
ISSN: 1422-0067
DOI: 10.3390/ijms22094948
Source: International Journal of Molecular Sciences [ISSN 1422-0067], v. 22(9), 4948, (Mayo 2021)
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