The FASEB Journal - 2022 - Nonnecke - Human intelectin‐2 ITLN2 is selectively expressed by secretory Paneth cells.pdf (1.74 MB)
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Human intelectin-2 (ITLN2) is selectively expressed by secretory Paneth cells

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journal contribution
posted on 23.06.2022, 10:31 authored by EB Nonnecke, PA Castillo, MEV Johansson, EJ Hollox, B Shen, B Lönnerdal, CL Bevins
Intelectins (intestinal lectins) are highly conserved across chordate evolution and have been implicated in various human diseases, including Crohn's disease (CD). The human genome encodes two intelectin genes, intelectin-1 (ITLN1) and intelectin-2 (ITLN2). Other than its high sequence similarity with ITLN1, little is known about ITLN2. To address this void in knowledge, we report that ITLN2 exhibits discrete, yet notable differences from ITLN1 in primary structure, including a unique amino terminus, as well as changes in amino acid residues associated with the glycan-binding activity of ITLN1. We identified that ITLN2 is a highly abundant Paneth cell-specific product, which localizes to secretory granules, and is expressed as a multimeric protein in the small intestine. In surgical specimens of ileal CD, ITLN2 mRNA levels were reduced approximately five-fold compared to control specimens. The ileal expression of ITLN2 was unaffected by previously reported disease-associated variants in ITLN2 and CD-associated variants in neighboring ITLN1 as well as NOD2 and ATG16L1. ITLN2 mRNA expression was undetectable in control colon tissue; however, in both ulcerative colitis (UC) and colonic CD, metaplastic Paneth cells were found to express ITLN2. Together, the data reported establish the groundwork for understanding ITLN2 function(s) in the intestine, including its possible role in CD.

Funding

National Institutes of Health U01AI125926 (Mucosal Immunology Study Team) and R37AI32738.

History

Citation

Nonnecke, EB, Castillo, PA, Johansson, MEV, et al. Human intelectin-2 (ITLN2) is selectively expressed by secretory Paneth cells. FASEB J. 2022; 36:e22200. doi:10.1096/fj.202101870R

Author affiliation

Department of Genetics and Genome Biology

Version

VoR (Version of Record)

Published in

FASEB Journal

Volume

36

Issue

3

Pagination

e22200

Publisher

Federation of American Society of Experimental Biology (FASEB) [Associate Organisation] Wiley Open Access [Commercial Publisher]

issn

0892-6638

eissn

1530-6860

Acceptance date

26/01/2022

Copyright date

2021

Available date

19/02/2022

Language

eng