Lack of TNFRI signaling enhances annexin A1 biological activity in intestinal inflammation

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• 作者：Angela A. Sena^a ; Luciano P. Pedrotti^a ; Bibiana E. Barrios^a ; Hugo Cejas^a ; Domingo Balderramo^b ; Ana Diller^c ; Silvia G. Correa^a ; ^{scorrea@fcq.unc.edu.ar" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Therapy ; DSS-induced colitis ; Inflammation ; Gut ; Epithelium
• 刊名：Biochemical Pharmacology
• 出版年：2015
• 出版时间：1 December 2015
• 年：2015
• 卷：98
• 期：3
• 页码：422-431
• 全文大小：2735 K

文摘

We evaluated whether the lack of TNF-α signaling increases mucosal levels of annexin A1 (AnxA1); the hypothesis stems from previous findings showing that TNF-α neutralization in Crohn’s disease patients up-regulates systemic AnxA1 expression. Biopsies from healthy volunteers and patients under anti-TNF-α therapy with remittent ulcerative colitis (UC) showed higher AnxA1 expression than those with active disease. We also evaluated dextran sulfate sodium (DSS)-acute colitis in TNF-α receptor 1 KO (TNFR1−/−) strain with impaired TNF-α signaling and C57BL/6 (WT) mice. Although both strains developed colitis, TNFR1−/− mice showed early clinical recovery, lower myeloperoxidase (MPO) activity and milder histopathological alterations. Colonic epithelium from control and DSS-treated TNFR1−/− mice showed intense AnxA1 expression and AnxA1+ CD4+ and CD8+ T cells were more frequent in TNFR1−/− animals, suggesting an extra supply of AnxA1. The pan antagonist of AnxA1 receptors exacerbated the colitis outcome in TNFR1−/− mice, supporting the pivotal role of AnxA1 in the early recovery. Our findings demonstrate that the TNF-α signaling reduction favors the expression and biological activity of AnxA1 in inflamed intestinal mucosa.