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1.
Eur J Nutr ; 58(3): 1203-1211, 2019 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-29468462

RESUMO

PURPOSE: The main objective of this study was to test the therapeutic potential of hydroxytyrosol and its combination with paclitaxel in breast cancer on oxidative stress status. METHODS: Impact on proliferation rates of different chemotherapy administration patterns was assayed in MCF-7 and MDA-MB-231 breast cancer cell lines. Breast tumor-bearing rats were randomly assigned to Control, Hydroxytyrosol, Paclitaxel and Paclitaxel plus hydroxytyrosol groups, for 6 weeks. Tumor volume, cell proliferation and several systemic oxidative stress parameters were measured. Anti-proliferative activity in vitro experiments was correlated with in vivo experiments. RESULTS: Combination group did significantly reduce tumor volume when compared with paclitaxel alone. Additionally, the combination improved the antioxidant status without compromising the antitumor activity of standard chemotherapy. CONCLUSION: These findings reveal for the first time that hydroxytyrosol is an active partner in combined therapies with paclitaxel against breast cancer. Combination with hydroxytyrosol would also ensure a less oxidative impact of chemotherapeutic drugs that could potentially improve patient wellness.


Assuntos
Antineoplásicos Fitogênicos/farmacologia , Antioxidantes/farmacologia , Neoplasias da Mama/tratamento farmacológico , Estresse Oxidativo/efeitos dos fármacos , Paclitaxel/farmacologia , Álcool Feniletílico/análogos & derivados , Animais , Linhagem Celular Tumoral , Proliferação de Células/efeitos dos fármacos , Modelos Animais de Doenças , Quimioterapia Combinada , Feminino , Álcool Feniletílico/farmacologia , Ratos , Ratos Sprague-Dawley , Resultado do Tratamento , Carga Tumoral/efeitos dos fármacos
2.
Nutr Metab (Lond) ; 13: 32, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-27141227

RESUMO

BACKGROUND: Apple polyphenols could represent a novel nutritional approach in the management and control of blood glucose, especially in type 2 diabetics. The aim of this study was to test the therapeutic potential of an apple polyphenol extract (APE) in an insulin-resistant rat model and to determine the molecular basis of insulin sensitivity action in skeletal muscle cells. METHODS: Acute effect of APE on the postprandial hyperglycemic response was assayed in 15 week old obese Zucker rats (OZR), by using a meal tolerance test (MTT). The ability of APE to improve whole peripheral insulin sensitivity was also assayed in a chronic study by using the euglycemic-hyperinsulinemic clamp technique. To elucidate the molecular mechanisms, rat L6 myotubes were used. Glucose uptake was measured by using 2-[3H]-Deoxy-Glucose (2-DG) and specific inhibitors, as well as phosphorylation status of key kinases, were used to determine the implicated signaling pathway. RESULTS: In vivo study showed that nutritional intervention with APE induced an increase of insulin sensitivity with an increase of glucose infusion rate (GIR) of 45 %. Additionally, in vitro results showed a synergistic effect between APE and insulin as well as increased glucose uptake through GLUT4 translocation in muscle cells. This translocation was mediated by phosphatydil inositol 3-kinase (PI3K) and peroxisome proliferator-activated receptor-gamma (PPARγ) signaling pathways. CONCLUSIONS: As a whole, this study describes the mechanisms involved in the insulin sensitizing effect of APE, which could be considered a promising ingredient for inclusion in nutritional products focused on the management of chronic diseases such as diabetes.

3.
Biochem Pharmacol ; 90(1): 25-33, 2014 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-24727461

RESUMO

Oxidative stress is involved in several processes including cancer, aging and cardiovascular disease, and has been shown to potentiate the therapeutic effect of drugs such as doxorubicin. Doxorubicin causes significant cardiotoxicity characterized by marked increases in oxidative stress and mitochondrial dysfunction. Herein, we investigate whether doxorubicin-associated chronic cardiac toxicity can be ameliorated with the antioxidant hydroxytyrosol in rats with breast cancer. Thirty-six rats bearing breast tumors induced chemically were divided into 4 groups: control, hydroxytyrosol (0.5mg/kg, 5days/week), doxorubicin (1mg/kg/week), and doxorubicin plus hydroxytyrosol. Cardiac disturbances at the cellular and mitochondrial level, mitochondrial electron transport chain complexes I-IV and apoptosis-inducing factor, and oxidative stress markers have been analyzed. Hydroxytyrosol improved the cardiac disturbances enhanced by doxorubicin by significantly reducing the percentage of altered mitochondria and oxidative damage. These results suggest that hydroxytyrosol improve the mitochondrial electron transport chain. This study demonstrates that hydroxytyrosol protect rat heart damage provoked by doxorubicin decreasing oxidative damage and mitochondrial alterations.


Assuntos
Cardiopatias/metabolismo , Neoplasias Mamárias Animais/metabolismo , Mitocôndrias Cardíacas/efeitos dos fármacos , Estresse Oxidativo/efeitos dos fármacos , Álcool Feniletílico/análogos & derivados , Animais , Antioxidantes/farmacologia , Fator de Indução de Apoptose/metabolismo , Doxorrubicina , Complexo I de Transporte de Elétrons/metabolismo , Complexo II de Transporte de Elétrons/metabolismo , Complexo III da Cadeia de Transporte de Elétrons/metabolismo , Complexo IV da Cadeia de Transporte de Elétrons/metabolismo , Ácidos Graxos/química , Ácidos Graxos/metabolismo , Feminino , Cromatografia Gasosa-Espectrometria de Massas , Cardiopatias/induzido quimicamente , Cardiopatias/complicações , Immunoblotting , Neoplasias Mamárias Animais/complicações , Microscopia Eletrônica , Mitocôndrias Cardíacas/metabolismo , Mitocôndrias Cardíacas/ultraestrutura , Oxirredução/efeitos dos fármacos , Álcool Feniletílico/farmacologia , Ratos , Ratos Sprague-Dawley
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