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Influence of chelation and oxidation state on vanadium bioavailability, and their effects on tissue concentrations of zinc, copper, and iron

TitleInfluence of chelation and oxidation state on vanadium bioavailability, and their effects on tissue concentrations of zinc, copper, and iron
Publication TypeJournal Article
Year of Publication2002
AuthorsThompson, KH, Tsukada, Y, Xu, ZM, Battell, M, McNeill, JH, Orvig, C
JournalBiological Trace Element Research
Volume86
Pagination31-44
Date PublishedApr
Type of ArticleArticle
ISBN Number0163-4984
KeywordsABSORPTION, BIS(MALTOLATO)OXOVANADIUM(IV), bone, CACO-2, Caco-2 cells, COMPLEXES, DIABETIC RATS, GLUCOSE-METABOLISM, IN-VITRO, INSULIN, kidney, ORTHO-VANADATE, skeletal muscle, SULFATE, VANADIUM, zinc
Abstract

Today, vanadium compounds are frequently included in nutritional supplements and are also being developed for therapeutic use in diabetes mellitus. Previously, tissue uptake of vanadium from bis(maltolato)oxovanadium(IV) (BMOV) was shown to be increased compared to its uptake from vanadyl sulfate (VS). Our primary objective was to test the hypothesis that complexation increases vanadium uptake and that this effect is independent of oxidation state. A secondary objective was to compare the effects of vanadium complexation and oxidation state on tissue iron, copper, and zinc. Wistar rats were fed either ammonium metavanadate (AMV), VS, or BMOV (1.2 mM each in the drinking water). Tissue uptake of V following 12 wk of BMOV or AMV was higher than that from VS (p < 0.05). BMOV led to decreased tissue Zn and increased bone Fe content. The same three compounds were compared in a cellular model of absorption (Caco-2 cells). Vanadium uptake from VS was higher than that from BMOV or AMV at 10 min, but from BMOV (250 μM only, 60 min), uptake was far greater than from AMV or VS. These results show that neither complexation nor oxidation state alone are adequate predictors of relative absorption, tissue accumulation, or trace element interactions.

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