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      Luminescence-based in vivo monitoring of NF-κB activity through a gene delivery approach

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          Abstract

          Background

          Monitoring activity of specific signaling pathways in vivo is challenging and requires highly sensitive methods to detect dynamic perturbations in whole organisms.

          Results

          In vivo gene delivery of a luciferase reporter followed by bioluminiscence imaging allows measuring NF-κB activity in mice liver and lungs.

          Conclusions

          This protocol allows a direct measure of NF-κB activity through quantification of bioluminescence signal, demonstrating its accuracy and sensitivity in different animal models and experimental conditions. Variants could be also applied for the analysis of NF-κB activity in different tissues or for studying other signaling pathways in vivo.

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          Most cited references20

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          Monitoring tumorigenesis and senescence in vivo with a p16(INK4a)-luciferase model.

          Monitoring cancer and aging in vivo remains experimentally challenging. Here, we describe a luciferase knockin mouse (p16(LUC)), which faithfully reports expression of p16(INK4a), a tumor suppressor and aging biomarker. Lifelong assessment of luminescence in p16(+/LUC) mice revealed an exponential increase with aging, which was highly variable in a cohort of contemporaneously housed, syngeneic mice. Expression of p16(INK4a) with aging did not predict cancer development, suggesting that the accumulation of senescent cells is not a principal determinant of cancer-related death. In 14 of 14 tested tumor models, expression of p16(LUC) was focally activated by early neoplastic events, enabling visualization of tumors with sensitivity exceeding other imaging modalities. Activation of p16(INK4a) was noted in the emerging neoplasm and surrounding stromal cells. This work suggests that p16(INK4a) activation is a characteristic of all emerging cancers, making the p16(LUC) allele a sensitive, unbiased reporter of neoplastic transformation. Copyright © 2013 Elsevier Inc. All rights reserved.
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            High levels of foreign gene expression in hepatocytes after tail vein injections of naked plasmid DNA.

            We have previously shown that the intramuscular injection of naked plasmid DNA enables foreign gene expression in muscle. Further studies showed that the intravascular delivery of naked plasmid DNA enables high levels of expression not only in muscle but also in hepatocytes. For the liver, this technique required injection directly into the liver vessels (portal vein, hepatic vein, or bile duct) and occlusion of outflow. The present study now demonstrates that high levels of plasmid DNA expression in hepatocytes can be easily obtained by tail vein injections. The highest levels of expression are achieved by rapidly injecting the plasmid DNA in large volumes, approximately 2.5 ml. This technique has great potential for a wide variety of laboratory studies.
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              NF-κB in Aging and Disease.

              Stochastic damage to cellular macromolecules and organelles is thought to be a driving force behind aging and associated degenerative changes. However, stress response pathways activated by this damage may also contribute to aging. The IKK/NF-κB signaling pathway has been proposed to be one of the key mediators of aging. It is activated by genotoxic, oxidative, and inflammatory stresses and regulates expression of cytokines, growth factors, and genes that regulate apoptosis, cell cycle progression, cell senescence, and inflammation. Transcriptional activity of NF-κB is increased in a variety of tissues with aging and is associated with numerous age-related degenerative diseases including Alzheimer's, diabetes and osteoporosis. In mouse models, inhibition of NF-κB leads to delayed onset of age-related symptoms and pathologies. In addition, NF-κB activation is linked with many of the known lifespan regulators including insulin/IGF-1, FOXO, SIRT, mTOR, and DNA damage. Thus NF-κB represents a possible therapeutic target for extending mammalian healthspan.
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                Author and article information

                Contributors
                Journal
                Cell Commun Signal
                Cell Commun. Signal
                Cell Communication and Signaling : CCS
                BioMed Central
                1478-811X
                2013
                21 March 2013
                : 11
                : 19
                Affiliations
                [1 ]Departamento de Bioquímica y Biología Molecular, Facultad de Medicina, Instituto Universitario de Oncología, Universidad de Oviedo, Oviedo, 33006, Spain
                Article
                1478-811X-11-19
                10.1186/1478-811X-11-19
                3608945
                23517552
                4f358469-1bc2-4bfb-8794-961d87849f05
                Copyright ©2013 Osorio et al.; licensee BioMed Central Ltd.

                This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 19 February 2013
                : 11 March 2013
                Categories
                Methodology

                Cell biology
                Cell biology

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