RESUMO
Familiar clustering of hepatitis B virus (HBV)-related hepatocellular carcinoma (HCC) has been frequently reported. However, limited information is available about the underlying molecular mechanisms in HBV-related HCC patients with family history of HCC. In our previous study, Agilent miRNA Base 16.0 microarray showed miRNA profiles of the plasma of HBV-related HCC patients who had a family history of HCC. This study aims to explore the expression, function, and mechanisms of miR-3188 in HCC that might provide novel insights into the role of family history on the risk of HCC. The expression levels of miR-3188 were markedly overexpressed in HCC tissues, HBV transgenic mice, and HepG2.215 cells. We knocked out miR-3188 in HCC cell lines using the CRISPR/Cas9 system, and demonstrated that miR-3188 knockout (KO) suppressed cell growth, migration, and invasion, and inhibited xenografts tumor growth in nude mice. Next, we determined that miR-3188 KO exerts antitumor functions by directly repressing ZHX2. It has been reported that HBV X protein (HBx) plays a critical role in HBV-related HCC, promoting CREB-mediated activation of miR-3188 and activation of Notch signaling through repressing ZHX2. Finally, we verified that ZHX2 functions as a transcriptional repressor to Notch1 via interaction with NF-YA. Our data demonstrate that the HBx-miR-3188-ZHX2-Notch1 signaling pathway plays an important role in the pathogenesis and progression of HBV-related HCC with family history of HCC. These findings have important implications for identifying new therapeutic targets in HBV-related HCC.
Assuntos
Carcinoma Hepatocelular/metabolismo , Neoplasias Hepáticas/metabolismo , MicroRNAs/metabolismo , Receptores Notch/metabolismo , Transativadores/metabolismo , Animais , Carcinoma Hepatocelular/genética , Imunoprecipitação da Cromatina , Regulação Neoplásica da Expressão Gênica/genética , Regulação Neoplásica da Expressão Gênica/fisiologia , Células Hep G2 , Humanos , Técnicas In Vitro , Neoplasias Hepáticas/genética , Camundongos , Camundongos Knockout , Camundongos Nus , Camundongos Transgênicos , MicroRNAs/genética , Receptores Notch/genética , Transdução de Sinais/genética , Transdução de Sinais/fisiologia , Transativadores/genética , Proteínas Virais Reguladoras e AcessóriasRESUMO
Minocycline, a semisynthetic tetracycline, is a highly lipophilic molecule capable of infiltrating tissues and blood. Previous studies have revealed the functions and mechanisms of minocycline in anti-inflammation, protection of the nervous system and certain tumors. The role of minocycline has never been investigated in hepatocellular carcinoma (HCC). The functions of minocycline on HCC cells were investigated using immunohistochemical staining and western blotting. Minocycline was applied to L02, HepG2 and Huh7 cells, and the growth characteristics were studied. Cisplatin was administered in combination with minocycline in this study. Cell cycle and apoptosis analyses were employed to investigate the mechanisms underlying the growth regulation associated with minocycline and(or) cisplatin. Minocycline caused S phase cell cycle arrest and an increase in the apoptotic rate associated with upregulation of p27, cleaved-caspase8, cleaved-caspase3 and cleaved-PRAP-1. Low dose of cisplatin promoted cell cycle arrest and apoptosis, whereas minocycline was mainly associated with upregulation of cleaved-PARP-1. The combination of cisplatin and minocycline increased the rate and extent of cell cycle arrest and increased the apoptosis rate caused by minocycline. A novel mechanism was revealed. Minocycline functions as an antitumor drug in HCC by regulating p27, caspase-3 and PARP-1. Cisplatin enhanced minocycline's effect on PARP-1.
Assuntos
Antineoplásicos/farmacologia , Carcinoma Hepatocelular/tratamento farmacológico , Cisplatino/farmacologia , Neoplasias Hepáticas/tratamento farmacológico , Minociclina/farmacologia , Animais , Protocolos de Quimioterapia Combinada Antineoplásica , Apoptose/efeitos dos fármacos , Carcinoma Hepatocelular/patologia , Pontos de Checagem do Ciclo Celular/efeitos dos fármacos , Linhagem Celular Tumoral , Sinergismo Farmacológico , Células Hep G2 , Humanos , Neoplasias Hepáticas/patologia , Camundongos , Camundongos Endogâmicos BALB C , Ensaios Antitumorais Modelo de XenoenxertoRESUMO
Although the role of Krüppel-like factor 17 (KLF17) in regulating epithelial-mesenchymal transition (EMT) has been explored in breast cancer, its influence on primary hepatocellular carcinoma (HCC) remains unclear. This study aims to investigate the expression status of KLF17 in hepatocellular carcinoma (HCC) and the correlation between KLF17 expression and metastatic potential of HCC. KLF17 expression in HCC and adjacent liver tissues was studied by real-time PCR and Western blot, and the relationship between KLF17 expression and the clinicopathological features of HCC was evaluated in 60 patients. By using RNA interference technique, the correlation of KLF17 expression and metastatic potential was investigated by down-regulating KLF17 expression in HepG2 cells, and the effects of KLF17 down-regulation on cell migration, and invasion were then analyzed. Furthermore, the correlation between KLF17 expression and the surgical outcomes of a cohort of HCC patients was analyzed. Reduced expression of KLF17 is associated with a short survival time in clinical patients (P = 0.034). Low KLF17 expression is related to tumor T stage (P = 0.045), tumor size (P = 0.027), lymph node stage (P = 0.030), M stage (P = 0.048), and portal vein tumor thrombosis significantly in HCC. Reduced expression of KLF17 promoted motility and invasion ability of HepG2 cells and changed the expression of E-cadherin, ZO-1, Snai1, and vimentin (genes are associated with EMT). Overall, these findings suggest a repressing role of KLF17 in tumor invasion and a new prognostic indicator in directing therapy. It deserves further exploration.
