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Am J Physiol Renal Physiol 279: F765-F777, 2000;
0363-6127/00 $5.00
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Vol. 279, Issue 4, F765-F777, October 2000

Expression characteristics and relevance of sodium glucose cotransporter-1 in mammalian renal tubulogenesis

Qiwei Yang, Yufeng Tian, Jun Wada, Naoki Kashihara, Elisabeth Wallner, Darryl Peterson, and Yashpal S. Kanwar

Departments of Pathology and Medicine, Northwestern University Medical School, Chicago, Illinois 60611

Expression and role of sodium glucose cotransporter (SGLT-1) in tubulogenesis were investigated during renal development. A mouse SGLT-1 cDNA was cloned, and it had substantial homology with human and rat forms. Four mRNA transcripts were detected, which differed in size from other species. SGLT-1 transcripts were detected at day 13 of gestation, and their expression increased during later stages extending into the postnatal period. A high mRNA and protein expression of SGLT-1 was seen in tubular segments of the inner cortex and outer medulla at day 16, and it was developmentally regulated. Treatment with SGLT-1 antisense selectively decreased the population of tubules in the metanephric explants. Expression of glomerular mRNA and WGA binding were unchanged. SGLT-1 activity, as measured by [14C]methyl-alpha -D-glucopyranoside uptake, increased during gestation in the tubular segments where it is expressed. Glucose uptake was inhibited by the treatment with SGLT-1 antisense and D-galactose. The data suggest that SGLT-1 exhibits a restricted spatiotemporal expression with functional activity confined to the corresponding tubular segments, and it selectively maintains renal tubulogenesis during development.

renal development


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