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Mediators of Inflammation
Volume 2015 (2015), Article ID 860534, 13 pages
http://dx.doi.org/10.1155/2015/860534
Research Article

HT-29 and Caco-2 Reporter Cell Lines for Functional Studies of Nuclear Factor Kappa B Activation

Cell Biology Unit, Institut Pasteur de Montevideo, Mataojo 2020, 11400 Montevideo, Uruguay

Received 6 November 2014; Revised 25 February 2015; Accepted 26 February 2015

Academic Editor: Flavio Caprioli

Copyright © 2015 Giuliana Mastropietro et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The NF-κB is a transcription factor which plays a key role in regulating biological processes. In response to signals, NF-κB activation occurs via phosphorylation of its inhibitor, which dissociates from the NF-κB dimer allowing the translocation to the nucleus, inducing gene expression. NF-κB activation has direct screening applications for drug discovery for several therapeutic indications. Thus, pathway-specific reporter cell systems appear as useful tools to screen and unravel the mode of action of probiotics and natural and synthetic compounds. Here, we describe the generation, characterization, and validation of human epithelial reporter cell lines for functional studies of NF-κB activation by different pro- and anti-inflammatory agents. Caco-2 and HT-29 cells were transfected with a pNF-κB-hrGFP plasmid which contains the GFP gene under the control of NF-κB binding elements. Three proinflammatory cytokines (TNF-, IL-1β, and LPS) were able to activate the reporter systems in a dose-response manner, which corresponds to the activation of the NF-κB signaling pathway. Finally, the reporter cell lines were validated using lactic acid bacteria and a natural compound. We have established robust Caco-2-NF-κB-hrGFP and HT-29-NF-κB-hrGFP reporter cell lines which represent a valuable tool for primary screening and identification of bacterial strains and compounds with a potential therapeutic interest.