Title : Developmental maturation of intestinal and renal thiamin uptake: studies in wild-type and transgenic mice carrying human THTR-1 and 2 promoters.

Pub. Date : 2006 Feb

PMID : 16206251






4 Functional Relationships(s)
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1 Mammals obtain thiamin through intestinal absorption, while in the kidney thiamin is reabsorbed to prevent its loss in the urine, both processes are specialized, carrier-mediated and involve thiamin transporters-1 and 2 (THTR-1 and THTR-2, respectively; products of the SLC19A2 and SLC19A3 genes). Thiamine solute carrier family 19 (thiamine transporter), member 2 Mus musculus
2 Mammals obtain thiamin through intestinal absorption, while in the kidney thiamin is reabsorbed to prevent its loss in the urine, both processes are specialized, carrier-mediated and involve thiamin transporters-1 and 2 (THTR-1 and THTR-2, respectively; products of the SLC19A2 and SLC19A3 genes). Thiamine solute carrier family 19 (thiamine transporter), member 2 Mus musculus
3 Carrier-mediated thiamin uptake by jejunal and renal brush border membrane vesicles (BBMV) both decreased with maturation (suckling>weanling>adult) and were associated with a reduction in mTHTR-1 and mTHTR-2 protein, mRNA levels, and the activity of human SLC19A2 and SLC19A3 promoter-reporter constructs in the intestines and kidneys of transgenic mice. Thiamine solute carrier family 19 (thiamine transporter), member 2 Mus musculus
4 These results are the first to demonstrate that intestinal and renal thiamin uptake are developmentally regulated during early stages of life, mediated through mTHTR-1 and mTHTR-2, and suggest the possible involvement of transcriptional regulatory mechanism(s) in this regulation. Thiamine solute carrier family 19 (thiamine transporter), member 2 Mus musculus