Shindo R, Katagiri T, Komazawa-Sakon S, Ohmuraya M, Takeda W, Nakagawa Y, Nakagata N, Sakuma T, Yamamoto T, Nishiyama C, Nishina T, Yamazaki S, Kameda H, Nakano H. Regenerating islet-derived protein (Reg)3β plays a crucial role in attenuation of ileitis and colitis in mice.
Biochem Biophys Rep 2020;
21:100738. [PMID:
32072024 DOI:
10.1016/j.bbrep.2020.100738]
[Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Revised: 12/26/2019] [Accepted: 01/25/2020] [Indexed: 12/16/2022] Open
Abstract
Regenerating islet-derived protein (Reg)3β belongs to a member of the Reg family of proteins and has pleiotropic functions, including antimicrobial activity and tissue repair. However, whether Reg3β plays a protective role in the development of colitis and ileitis has not been fully investigated. We generated transgenic mice expressing a short form of cellular FLICE-inhibitory protein (cFLIPs) that promotes necroptosis, a regulated form of cell death. cFLIPs transgenic (CFLARs Tg) mice develop severe ileitis in utero. Although Reg3β is undetectable in the small intestine of wild-type embryos, its expression is aberrantly elevated in the small intestine of CFLARs Tg embryos. To test whether elevated Reg3β attenuates or exacerbates ileitis in CFLARs Tg mice, we generated a Reg3b−/− strain. Reg3b−/− mice grew to adulthood without apparent abnormalities. Deletion of Reg3b in CFLARs Tg mice exacerbated the embryonic lethality of CFLARs Tg mice. Dextran sulfate sodium-induced colitis, characterized by body weight loss and infiltration of neutrophils, was exacerbated in Reg3b−/− compared to wild-type mice. Moreover, the expression of Interleukin 6, an inflammatory cytokine and Chitinase-like 3, a marker for tissue repair macrophages was elevated in the colon of Reg3b−/− mice compared to wild-type mice after DSS treatment. Together, these results suggest that attenuation of colitis and ileitis is a result of Reg3β′s real function.
The expression of Reg3β is elevated in the embryonic small intestine of CFLARs Tg mice.
Reg3b−/− mice grow to adulthood without apparent abnormalities.
Dextran sulfate sodium-induced colitis is exacerbated in Reg3b−/− mice.
Deletion of Reg3b exacerbates ileitis in CFLARs Tg mice.
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