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. 1998 Sep 15;334(Pt 3):633–640. doi: 10.1042/bj3340633

Thyroid hormone regulation of the Na+/glucose cotransporter SGLT1 in Caco-2 cells.

M Matosin-Matekalo 1, J E Mesonero 1, O Delezay 1, J C Poiree 1, A A Ilundain 1, E Brot-Laroche 1
PMCID: PMC1219733  PMID: 9729472

Abstract

The expression of the Na+/glucose cotransporter (SGLT1) in response to thyroid hormone [3,5,3'-tri-iodo-l-thyronine (T3)] was investigated in the enterocytic model cell line Caco-2/TC7. In differentiated cells, T3 treatment induces an average 10-fold increase in glucose consumption as well as a T3 dose-dependent increase in SGLT1 mRNA abundance. Only cells grown on glucose-containing media, but not on the non-metabolizable glucose analogue alpha-methylglucose (AMG), could respond to T3-treatment. The Vmax parameter of AMG transport was enhanced 6-fold by T3 treatment, whereas the protein abundance of SGLT1 was unchanged. The role of Na+ recycling in the T3-related activation of SGLT1 activity was suggested by both the large increase in Na+/K+ATPase protein abundance and the inhibition, down to control levels, of AMG uptake in ouabain-treated cells. Further investigations aimed at identifying the presence of a second cotransporter that could be expressed erroneously in the colon cancer cell line were unsuccessful: T3-treatment did not modify the sugar-specificity profile of AMG transport and did not induce the expression of SGLT2 as assessed by reverse transcription-PCR. Our results show that T3 can stimulate the SGLT1 cotransport activity in Caco-2 cells. Both transcriptional and translational levels of regulation are involved. Finally, glucose metabolism is required for SGLT1 expression, a result that contrasts with the in vivo situation and may be related to the fetal phenotype of the cells.

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Selected References

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