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. 1988 Apr;398:329–339. doi: 10.1113/jphysiol.1988.sp017045

Transport of thiamine by brush-border membrane vesicles from rat small intestine.

D Casirola 1, G Ferrari 1, G Gastaldi 1, C Patrini 1, G Rindi 1
PMCID: PMC1191775  PMID: 3392675

Abstract

1. Microvillous vesicles obtained by a Ca2+ precipitation method from the intestine of adult Wistar albino rats were incubated at 25 degrees C with [35S]- or [3H]thiamine of high specific activity. 2. The time course of thiamine uptake was not influenced by the presence of Na+ or K+ nor by the absence of alkaline cations in the incubation medium. 3. At concentrations below 1.25 microM, thiamine was taken up mainly by a saturable mechanism with apparent Km = 0.8 microM and Vmax = 0.35 pmol mg protein-1 4 s-1. At higher concentrations, a non-saturable uptake mechanism prevailed. 4. The thiamine taken up was transferred to the intravesicular space. No thiamine phosphoesters could be detected in the vesicles. 5. The vesicular transport of thiamine was inhibited competitively by several thiamine derivatives and structural analogues, including: cold thiamine; thiamine monophosphate (inhibition constant, Ki = 33 microM); pyrithiamine (Ki = 1.7 microM); 2'-ethylthiamine (Ki = 27 microM); 5-chloroethylthiamine (Ki = 70 microM): Amprolium (Ki = 55 microM); 4'-oxythiamine (Ki = 510 microM).

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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