Journal articles
Activation of the NF kappa B Pathway Enhances AhR Expression in Intestinal Caco-2 Cells
Abstract : Recent data suggest that apart from its well-known role in the regulation of xenobiotic metabolizing enzymes, AhR is also involved in inflammation. However, the influence of inflammation on AhR expression remains unknown. Here, we demonstrated that proinflammatory conditions induced by either PMA or IL-1 beta enhance AhR expression in Caco-2 cells. This was associated with an increase in AhR promoter activity. By means of directed mutagenesis experiments and the use of proteasome inhibitors, we demonstrated that inflammation-induced AhR expression involved the NF kappa B pathway but not AP-1. Moreover, conditioned media from PMA-treated Caco-2 cells were also able to induce AhR expression, and this induction was repressed by anti-IL-1 beta blocking antibodies. Similar results were obtained with conditioned media from PMA-treated THP-1 cells. Taken together, these data suggest that AhR could be involved in vivo in an inflammatory loop. AhR was recently suspected to be implicated in inflammatory bowel disease. Our results support this hypothesis and suggest that AhR could be a new target for inflammatory bowel disease patient management.
Cited literature [26 references]
https://hal-amu.archives-ouvertes.fr/hal-01460445
Contributor : Didier Gigmes <>
Submitted on : Thursday, May 24, 2018 - 5:49:58 PM
Last modification on : Friday, May 29, 2020 - 10:36:02 AM
Long-term archiving on: : Saturday, August 25, 2018 - 2:50:46 PM
Contributor : Didier Gigmes <>
Submitted on : Thursday, May 24, 2018 - 5:49:58 PM
Last modification on : Friday, May 29, 2020 - 10:36:02 AM
Long-term archiving on: : Saturday, August 25, 2018 - 2:50:46 PM
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