Constitutive Activation of NF-κB in Human Hepatocellular Carcinoma: Evidence of a Cytoprotective Role
| العنوان: | Constitutive Activation of NF-κB in Human Hepatocellular Carcinoma: Evidence of a Cytoprotective Role |
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| المؤلفون: | Liang Qiao, Jun Yu, Christoph Röcken, Paul Dent, Matthias P. Ebert, Rona Francisco, Hongxia Zhang, Geoffrey C. Farrell |
| المصدر: | Human Gene Therapy. 17:280-290 |
| بيانات النشر: | Mary Ann Liebert Inc, 2006. |
| سنة النشر: | 2006 |
| مصطلحات موضوعية: | medicine.medical_specialty, Programmed cell death, Carcinoma, Hepatocellular, Apoptosis, Caspase 3, Biology, medicine.disease_cause, Adenoviridae, NF-KappaB Inhibitor alpha, Internal medicine, Tumor Cells, Cultured, Genetics, medicine, Humans, Cytotoxicity, Molecular Biology, Cell Proliferation, Cell growth, Liver Neoplasms, NF-kappa B, DNA, Hydrogen Peroxide, Oxidants, beta-Galactosidase, digestive system diseases, Oxidative Stress, Protein Transport, Endocrinology, Cell killing, Liver, Cytoprotection, Caspases, Cancer cell, Cancer research, Molecular Medicine, I-kappa B Proteins, Oxidative stress |
| الوصف: | Activation of nuclear factor-kappaB (NF-kappaB) can promote or inhibit apoptosis. Oxidative stress is an important mechanism by which certain anticancer drugs kill cancer cells, and is also one of the mechanisms that activate NF-kappaB. We therefore examined hepatic expression of the NF-kappaB monomer p65 in human hepatocellular carcinoma (HCC) tissue samples from eight patients and compared it with their respective samples of surrounding liver tissues. We also studied the effect of NF-kappaB inhibition in human HCC cells exposed to oxidative stress, by infecting HuH7 cells with a recombinant adenovirus carrying mutant IkappaBalpha (mIkappaBalpha). Cultured HuH7 cells were infected with mIkappaBalpha or beta-galactosidase (beta-Gal) for 24 hr followed by treatment with increasing concentrations of H2O2. Cytotoxicity, NF-kappaB translocation, NF-kappaB DNA binding, cell proliferation, and apoptosis were determined. The monomer p65 was overexpressed in six of eight human HCC tissues. In HuH7 cells, introduction of mIkappaBalpha potently inhibited the translocation, activation, and DNA binding of NF- kappaB. In control (beta-Gal-infected) HuH7 cells, exposure to H2O2 produced a dose-dependent increase in apoptosis, regardless of NF-kappaB status. mIkappaBalpha-mediated inhibition of NF-kappaB activation sensitized HuH7 cells to H2O2-induced inhibition of cell growth, and further promoted cell death. Addition of H2O2 (200-500 microM) to control or mIkappaBalpha-infected HuH7 cells enhanced caspase-3 activity and cleavage. Adenovirus-mediated transfer of mIkappaBalpha potently inhibits NF-kappaB activity in HuH7 cells, and this enhances oxidative stress-induced cell killing. |
| تدمد: | 1557-7422 1043-0342 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::69796bbab078062d817b4a8f90acc9fcTest https://doi.org/10.1089/hum.2006.17.280Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....69796bbab078062d817b4a8f90acc9fc |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15577422 10430342 |
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