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1.
Biochem Pharmacol ; 175: 113856, 2020 Feb 14.
Artigo em Inglês | MEDLINE | ID: mdl-32061772

RESUMO

Cancer easily induces resistance to most chemotherapy drugs. In this study, we investigated the combination cytotoxic and antitumor effects of canagliflozin (CAN) and doxorubicin (DOX) in vitro and in vivo. CAN significantly increased the cytotoxicity of DOX in HepG2, HepG2-ADR (adriamycin or doxorubicin-resistant) and MCF7 cells. CAN significantly promoted the intracellular uptake of DOX in HepG2 cells. CAN also reduced the P-glycoprotein (P-gp) level in HepG2 cells. The function of P-gp required ATP, but CAN significantly reduced the intracellular ATP level. CAN might inhibit the function of p-gp, increase the intracellular DOX concentration and contribute to an enhanced cytotoxic activity. Autophagy plays a protective role in chemotherapy-induced cell survival. However, CAN significantly inhibited DOX-induced autophagy in HepG2 cells, and the mechanism appeared to be mediated by promoting ULK1 ser 757 phosphorylation. The downregulation of P-gp may be associated with protein degradation but is independent of the autophagy pathway. Furthermore, in HepG2-xenograft BALB/c nude mice, CAN significantly increased the antitumor effect of DOX. This study is the first to report that a classical antidiabetic drug, CAN improved the sensitivity to the antitumor effect of DOX, and the potential molecular mechanisms of CAN may involve the inhibition of P-gp function and the autophagy pathway.

2.
Molecules ; 23(8)2018 Jul 29.
Artigo em Inglês | MEDLINE | ID: mdl-30060618

RESUMO

Obesity and nonalcoholic fatty liver disease (NAFLD) are highly prevalent and cause numerous metabolic diseases. However, drugs for the prevention and treatment of obesity and NAFLD remain unavailable. In this study, we investigated the effects of mogrosides (luo han guo, LH) in Siraitia grosvenorii saponins on high-fat-diet-induced obesity and NAFLD in mice. We found that compared with the negative control, LH reduced body and liver weight. LH also decreased fat accumulation and increased AMP-activated protein kinase (AMPK) phosphorylation (pAMPK) levels in mouse livers. We also found that high-purity mogroside V upregulated pAMPK expression in HepG2 cells. In addition, high-purity mogroside V inhibited reactive oxygen species production and upregulated sequestosome-1 (SQSTM1, p62) expression in THP-1 cells. These results suggest that LH may affect obesity and NAFLD by enhancing fat metabolism and antioxidative defenses. Mogroside V may be a main component of LH. However, the exact molecular mechanisms and active components responsible for the inhibitory effects of LH on obesity and NAFLD require further investigation.


Assuntos
Fármacos Antiobesidade/farmacologia , Anticolesterolemiantes/farmacologia , Momordica/química , Hepatopatia Gordurosa não Alcoólica/tratamento farmacológico , Obesidade/tratamento farmacológico , Triterpenos/farmacologia , Proteínas Quinases Ativadas por AMP/genética , Proteínas Quinases Ativadas por AMP/metabolismo , Tecido Adiposo/efeitos dos fármacos , Tecido Adiposo/metabolismo , Tecido Adiposo/patologia , Animais , Fármacos Antiobesidade/química , Fármacos Antiobesidade/isolamento & purificação , Anticolesterolemiantes/química , Anticolesterolemiantes/isolamento & purificação , Peso Corporal/efeitos dos fármacos , Dieta Hiperlipídica/efeitos adversos , Regulação da Expressão Gênica , Células Hep G2 , Humanos , Fígado/efeitos dos fármacos , Fígado/metabolismo , Fígado/patologia , Masculino , Camundongos , Hepatopatia Gordurosa não Alcoólica/etiologia , Hepatopatia Gordurosa não Alcoólica/metabolismo , Hepatopatia Gordurosa não Alcoólica/patologia , Obesidade/etiologia , Obesidade/metabolismo , Obesidade/patologia , Tamanho do Órgão/efeitos dos fármacos , Espécies Reativas de Oxigênio/antagonistas & inibidores , Espécies Reativas de Oxigênio/metabolismo , Saponinas/química , Saponinas/isolamento & purificação , Saponinas/farmacologia , Proteína Sequestossoma-1/agonistas , Proteína Sequestossoma-1/genética , Proteína Sequestossoma-1/metabolismo , Células THP-1 , Triterpenos/química , Triterpenos/isolamento & purificação
3.
Oxid Med Cell Longev ; 2017: 7841823, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-28337253

RESUMO

In the present study, the components of A. cinnamomea (AC) mycelia were systematically analyzed. Subsequently, its hepatoprotective effects and the underlying mechanisms were explored using a mouse model of acute alcohol-induced liver injury. AC contained 25 types of fatty acid, 16 types of amino acid, 3 types of nucleotide, and 8 types of mineral. The hepatoprotective effects were observed after 2 weeks of AC treatment at doses of 75 mg/kg, 225 mg/kg, and 675 mg/kg in the mouse model. These effects were indicated by the changes in the levels of aspartate aminotransferase, alanine aminotransferase, several oxidation-related factors, and inflammatory cytokines in serum and/or liver samples. AC reduced the incidence rate of necrosis, inflammatory infiltration, fatty droplets formation, and cell apoptosis in liver detecting via histological and TUNEL assay. In addition, AC reduced the expression of cleaved caspase-3, -8, and -9 and the levels of phosphor-protein kinase B (Akt) and phosphor-nuclear factor-κB (NF-κB) in the liver samples. Collectively, AC-mediated hepatoprotective effects in a mouse model of acute alcohol-induced liver injury are the result of reduction in oxidative stress. This may be associated with Akt/NF-κB signaling. These results provide valuable evidence to support the use of A. cinnamomea as a functional food and/or medicine.


Assuntos
Antrodia/química , Estresse Oxidativo/efeitos dos fármacos , Extratos Vegetais/farmacologia , Substâncias Protetoras/farmacologia , Transdução de Sinais/efeitos dos fármacos , Alanina Transaminase/sangue , Álcoois/toxicidade , Animais , Antioxidantes/metabolismo , Antrodia/metabolismo , Aspartato Aminotransferases/sangue , Caspase 3/metabolismo , Caspase 8/metabolismo , Caspase 9/metabolismo , Doença Hepática Induzida por Substâncias e Drogas/metabolismo , Doença Hepática Induzida por Substâncias e Drogas/patologia , Citocinas/sangue , Citocinas/metabolismo , Modelos Animais de Doenças , Fígado/metabolismo , Fígado/patologia , Camundongos , NF-kappa B/metabolismo , Extratos Vegetais/química , Substâncias Protetoras/química , Proteínas Proto-Oncogênicas c-akt/metabolismo , Espécies Reativas de Oxigênio/metabolismo
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