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Eur J Immunol. 2016 Apr;46(4):912-8. doi: 10.1002/eji.201546075. Epub 2016 Jan 18.

Characterization of a conditional interleukin-1 receptor 1 mouse mutant using the Cre/LoxP system.

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Faculty of Life Sciences, University of Manchester, Manchester, UK.
Biochemistry Department, Faculty of Sciences, King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia.
Institute for Molecular Medicine, Medical University of Johannes Gutenberg-University of Mainz, Mainz, Germany.


IL-1 is a key cytokine known to drive chronic inflammation and to regulate many physiological, immunological, and neuroimmunological responses via actions on diverse cell types of the body. To determine the mechanisms of IL-1 actions as part of the inflammatory response in vivo, we generated a conditional IL-1 receptor 1 (IL-1R1) mouse mutant using the Cre/LoxP system (IL-1R1(fl/fl) ). In the mutant generated, exon 5, which encodes part of the extracellular-binding region of the receptor, is flanked by LoxP sites, thereby inactivating the two previously described functional IL-1R1 gene transcripts after Cre-mediated recombination. Using keratin 14-Cre driver mice, new IL-1R1 deficient (-/-) mice were subsequently generated, in which all signaling IL-1 receptor isoforms are deleted ubiquitously. Furthermore, using vav-iCre driver mice, we deleted IL-1 receptor isoforms in the hematopoietic system. In these mice, we show that both the IL-17 and IL-22 cytokine response is reduced, when mice are challenged by the helminth Trichuris muris. We are currently crossing IL-1R1(fl/fl) mice with different Cre-expressing mice in order to study mechanisms of acute and chronic inflammatory diseases.


Cre/loxP; IL-17; Immune regulation; Infection; Trichuris muris

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