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Inflammation Controls Sensitivity of Human and Mouse Intestinal Epithelial Cells to Galectin-1.

Abstract：

:Galectins play key roles in the inflammatory cascade. In this study, we aimed to analyze the effect of galectin-1 (Gal-1) in the function of intestinal epithelial cells (IECs) isolated from healthy and inflamed mucosa. IECs isolated from mice or patients with inflammatory bowel diseases (IBD) were incubated with different pro-inflammatory cytokines, and Gal-1 binding, secretion of homeostatic factors and viability were assessed. Experimental models of food allergy and colitis were used to evaluate the in vivo influence of inflammation on Gal-1 binding and modulation of IECs. We found an enhanced binding of Gal-1 to: (a) murine IECs exposed to IL-1β, TNF, and IL-13; (b) IECs from inflamed areas in intestinal tissue from IBD patients; (c) small bowel of allergic mice; and (d) colon from mice with experimental colitis. Our results showed that low concentrations of Gal-1 favored a tolerogenic micro-environment, whereas high concentrations of this lectin modulated viability of IECs through mechanisms involving activation of caspase-9 and modulation of Bcl-2 protein family members. Our results showed that, when added in the presence of diverse pro-inflammatory cytokines such as tumor necrosis factor (TNF), IL-13 and IL-5, Gal-1 differentially promoted the secretion of growth factors including thymic stromal lymphopoietin (TSLP), epidermal growth factor (EGF), IL-10, IL-25, and transforming growth factor (TGF-β1 ). In conclusion, we found an augmented binding of Gal-1 to IECs when exposed in vitro or in vivo to inflammatory stimuli, showing different effects depending on Gal-1 concentration. These findings highlight the importance of the inflammatory micro-environment of mucosal tissues in modulating IECs susceptibility to the immunoregulatory lectin Gal-1 and its role in epithelial cell homeostasis.

journal_name

J Cell Physiol

journal_title

Journal of cellular physiology

authors

Muglia CI,Gobbi RP,Smaldini P,Delgado ML,Candia M,Zanuzzi C,Sambuelli A,Rocca A,Toscano MA,Rabinovich GA,Docena GH

doi

10.1002/jcp.25249

subject

Has Abstract

pub_date

2016-07-01 00:00:00

pages

1575-85

issue

eissn

0021-9541

issn

1097-4652

journal_volume

231

pub_type

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Inflammation Controls Sensitivity of Human and Mouse Intestinal Epithelial Cells to Galectin-1.