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Food-grade TiO2 is trapped by intestinal mucus in vitro but does not impair mucin O-glycosylation and short-chain fatty acid synthesis in vivo: implications for gut barrier protection

Talbot, Pauline and Radziwill-Bienkowska, Joanna M. and Kamphuis, Jasper B. J. and Steenkeste, Karine and Bettini, Sarah and Robert, Véronique and Noordine, Marie-Louise and Mayeur, Camille and Gaultier, Eric and Langella, Philippe and Robbe-Masselot, Catherine and Houdeau, Eric and Thomas, Muriel and Mercier-Bonin, Muriel (2018) Food-grade TiO2 is trapped by intestinal mucus in vitro but does not impair mucin O-glycosylation and short-chain fatty acid synthesis in vivo: implications for gut barrier protection. Journal of Nanobiotechnology, 16 (1). p. 53. ISSN 1477-3155

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Official URL: http://doi.org/10.1186/s12951-018-0379-5

Abstract

BACKGROUND: Titanium dioxide (TiO2) particles are commonly used as a food additive (E171 in the EU) for its whitening and opacifying properties. However, the risk of gut barrier disruption is an increasing concern because of the presence of a nano-sized fraction. Food-grade E171 may interact with mucus, a gut barrier protagonist still poorly explored in food nanotoxicology. To test this hypothesis, a comprehensive approach was performed to evaluate in vitro and in vivo interactions between TiO2 and intestinal mucus, by comparing food-grade E171 with NM-105 (Aeroxyde P25) OECD reference nanomaterial. RESULTS: We tested E171-trapping properties of mucus in vitro using HT29-MTX intestinal epithelial cells. Time-lapse confocal laser scanning microscopy was performed without labeling to avoid modification of the particle surface. Near-UV irradiation of E171 TiO2 particles at 364 nm resulted in fluorescence emission in the visible range, with a maximum at 510 nm. The penetration of E171 TiO2 into the mucoid area of HT29-MTX cells was visualized in situ. One hour after exposure, TiO2 particles accumulated inside "patchy" regions 20 µm above the substratum. The structure of mucus produced by HT29-MTX cells was characterized by MUC5AC immunofluorescence staining. The mucus layer was thin and organized into regular "islands" located approximately 20 µm above the substratum. The region-specific trapping of food-grade TiO2 particles was attributed to this mucus patchy structure. We compared TiO2-mediated effects in vivo in rats after acute or sub-chronic oral daily administration of food-grade E171 and NM-105 at relevant exposure levels for humans. Cecal short-chain fatty acid profiles and gut mucin O-glycosylation patterns remained unchanged, irrespective of treatment. CONCLUSIONS: Food-grade TiO2 is trapped by intestinal mucus in vitro but does not affect mucin O-glycosylation and short-chain fatty acid synthesis in vivo, suggesting the absence of a mucus barrier impairment under "healthy gut" conditions.

Item Type:Article
Uncontrolled Keywords:Food-grade TiO2; Gut barrier; Mucin O-glycans; Mucus; Short-chain fatty acids
Subjects:Q Science > QP Physiology
T Technology > TP Chemical technology
Divisions:Department of Microbial Biochemistry
ID Code:1622
Deposited By: Joanna Maria Radziwill-Bienkowska
Deposited On:21 Nov 2018 08:29
Last Modified:21 Nov 2018 08:29

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