Carbohydrate-binding motif in chitinase 3-like 1 (CHI3L1/YKL-40) specifically activates Akt signaling pathway in colonic epithelial cells.

Carbohydrate-binding motif in chitinase 3-like 1 (CHI3L1/YKL-40) specifically activates Akt signaling pathway in colonic epithelial cells.
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DOI:
10.1016/j.clim.2011.04.007
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发表时间:
2011-09
期刊:
Clinical immunology (Orlando, Fla.)
影响因子:
--
通讯作者:
Mizoguchi E
Mizoguchi E
中科院分区:
其他
文献类型:
--
作者:
Chen CC;Llado V;Eurich K;Tran HT;Mizoguchi E

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宿主-微生物相互作用在结肠炎的发展过程中起着关键作用。我们以前已经表明,中国酶3样1(CHI 3L 1)是一种诱导分子在结肠上皮细胞(CEC)在炎症条件下过表达。在本研究中,我们通过在SW 480 CEC中转染几丁质结合基序(chitin-binding motif,CBM)突变的CHI 3L 1载体,发现CBM与CHI 3L 1介导的CEC中Akt信号通路的激活特异性相关。在下游,CHI 3L 1以剂量依赖性方式增强IL-8和TNFα的分泌。我们以前表明,CBM中的325至339个氨基酸对CHI 3L 1的生物学功能至关重要。在此,我们证明了CHI 3L 1中CBM的第325 - 339位残基是激活Akt、IL-8产生以及CHI 3L 1特异性细胞定位的关键区域。结论:CHI 3L 1的CBM区在激活CEC中Akt信号通路中起关键作用,其激活可能与慢性结肠炎的发生发展有关。
Host-microbial interactions play a key role during the development of colitis. We have previously shown that chinase 3-like 1 (CHI3L1) is an inducible molecule overexpressed in colonic epithelial cells (CECs) under inflammatory conditions. In this study, we found that chitin-binding motif (CBM) of CHI3L1 is specifically associated with the CHI3L1-mediated activation of the Akt-signaling in CEC by transfecting the CBM-mutant CHI3L1 vectors in SW480 CECs. Downstream, CHI3L1 enhanced the secretion of IL-8 and TNFα in a dose-dependent manner. We previously show that 325 through 339 amino-acids in CBM are crucial for the biological function of CHI3L1. Here we demonstrated that 325th–339th residues of CBM in CHI3L1 is a critical region for the activation of Akt, IL-8 production, and for a specific cellular localization of CHI3L1. In conclusion, CBM region of CHI3L1 is critical in activating Akt signaling in CECs, and the activation may be associated with the development of chronic colitis.
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