Up-regulation of Sodium-dependent Glucose Transporter by Interaction with Heat Shock Protein 70
| Autor: | Kazuya Kawano, Akira Ikari, Yasunobu Suketa, Mika Nakano |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Hot Temperature
Time Factors Monosaccharide Transport Proteins Swine Glucose uptake Blotting Western Biology Biochemistry Cell Line Transforming Growth Factor beta1 Adenosine Triphosphate Sodium-Glucose Transporter 1 Transforming Growth Factor beta Heat shock protein Animals HSP70 Heat-Shock Proteins Molecular Biology Membrane Glycoproteins Microscopy Confocal Dose-Response Relationship Drug Cell Membrane digestive oral and skin physiology Glucose transporter Biological Transport Cell Biology Transfection Apical membrane Immunohistochemistry Precipitin Tests Up-Regulation Hsp70 Cell biology Glucose Cell culture Electrophoresis Polyacrylamide Gel |
| Zdroj: | Journal of Biological Chemistry. 277:33338-33343 |
| ISSN: | 0021-9258 |
| DOI: | 10.1074/jbc.m200310200 |
| Popis: | Heat shock stress induces some heat shock proteins, including Hsp70, and activates sodium-dependent glucose transport in porcine renal LLC-PK(1) cells, but its mechanisms have not been described in detail. We investigated whether sodium-dependent glucose transporter (SGLT1) interacts with Hsp70 to increase SGLT1 activity. Heat shock stress increased SGLT1 activity without changing SGLT1 expression. The increase of SGLT1 activity was completely inhibited by an anti-transforming growth factor-beta1 (TGF-beta1) antibody. Instead of heat shock stress, TGF-beta1 increased SGLT1 activity dose- and time-dependently without changing SGLT1 expression. We found that the amount of Hsp70 immunoprecipitated from TGF-beta1-treated cells with an anti-SGLT1 antibody was higher than that of the control cells. Transfection of an anti-Hsp70 antibody into the cells inhibited the increase of SGLT1 activity. With confocal laser microscopy, both SGLT1 and Hsp70 was localized near the apical membrane in the TGF-beta1-treated cells, and an anti-Hsp70 antibody disturbed this localization. Furthermore, we clarified that an anti-Hsp70 antibody inhibited interaction of SGLT1 with Hsp70 in vitro. These results suggest that Hsp70 forms a complex with SGLT1 and increases the expression level of SGLT1 in the apical membrane, resulting in up-regulation of glucose uptake. |
| Databáze: | OpenAIRE |
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