Evaluation of immunologic and intestinal effects in rats administered an E 171-containing diet, a food grade titanium dioxide (TiO).

Author(s) Blevins, L.K.; Crawford, R.B.; Bach, A.; Rizzo, M.D.; Zhou, J.; Henriquez, J.E.; Khan, D.M.Isha Oli; Sermet, S.; Arnold, L.L.; Pennington, K.L.; Souza, N.P.; Cohen, S.M.; Kaminski, N.E.
Journal Food Chem Toxicol
Date Published 2019 Nov
Abstract

The toxicity of dietary E 171, a food grade titanium dioxide was evaluated. A recent study reported rats receiving E 171 in water developed inflammation and aberrant crypt foci (ACF) in the gastrointestinal tract. Here, rats received food containing E 171 (7 or 100 days). The 100-day study included feeding E 171 after dimethylhydrazine (DMH) or vehicle only pretreatment. Food consumption was similar between treatment groups with maximum total cumulative E 171 exposure being 2617 mg/kg in 7 days and 29,400 mg/kg in 100 days. No differences were observed due to E 171 in the percentage of dendritic, CD4 T or T cells within Peyer's patches or the periphery, or in cytokine production in plasma, sections of jejunum, and colon in 7- or 100-day E 171 alone fed rats. Differences were observed for IL-17A in colon (400 ppm E 171 + DMH) and IL-12p70 in plasma (40 ppm E 171 + DMH). E 171 had no effect on histopathologic evaluations of small and large intestines, liver, spleen, lungs, or testes, and no effects on ACF, goblet cell numbers, or colonic gland length. Dietary E 171 administration (7- or 100-day), even at high doses, produced no effect on the immune parameters or tissue morphology.

DOI 10.1016/j.fct.2019.110793
ISSN 1873-6351
Citation Blevins LK, Crawford RB, Bach A, Rizzo MD, Zhou J, Henriquez JE, et al. Evaluation of immunologic and intestinal effects in rats administered an E 171-containing diet, a food grade titanium dioxide (TiO). Food Chem Toxicol. 2019;133:110793.