This study aimed to elucidate the role of nitric oxide (NO) in intestinal stem cells in methotrexate-induced ileal mucositis in rats. Methotrexate induced the mRNA expressions of the Wnt/β-catenin target genes Wnt3a, Sox9, and Lgr5 and the Wnt-antagonist gene sFRP-1 and the protein expressions of Lgr5 and sFRP-1. Methotrexate also induced Lgr5+ cells and lysozyme+ cells. A non-selective NO inhibitor inhibited the methotrexate induction of Wnt/β-catenin target genes and Lgr5+ cells but enhanced that of sFRP-1 expression. Thus, methotrexate mediates the integrity of intestinal stem cells partly through NO-dependent Wnt/β-catenin signaling and may enhance tolerability to methotrexate-induced injury.
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