| First Author | Zhang JZ | Year | 2001 |
| Journal | Am J Physiol Cell Physiol | Volume | 280 |
| Issue | 5 | Pages | C1277-83 |
| PubMed ID | 11287341 | Mgi Jnum | J:69081 |
| Mgi Id | MGI:1934003 | Doi | 10.1152/ajpcell.2001.280.5.C1277 |
| Citation | Zhang JZ, et al. (2001) Overexpression of stomatin depresses GLUT-1 glucose transporter activity. Am J Physiol Cell Physiol 280(5):C1277-83 |
| abstractText | We showed previously that GLUT-1 glucose transporter is associated with stomatin (band 7.2b) in human red blood cell membranes and in Clone 9 cells. We show here that in a mixed population of stably transfected cells, overexpression of either murine or human stomatin resulted in 35-50% reduction in the basal rate of glucose transport. Moreover, there was a correlation between increased expression of stomatin and depression in the rate of glucose transport. In two clones chosen for further study, the ~10% and ~70% reduction in basal rate of glucose transport was associated with increases in stomatin mRNA and protein expression without a detectable change in GLUT-1 content in plasma membranes of either clone. In the clone overexpressing high levels of stomatin, immunoprecipitated GLUT-1 was associated with a large amount of stomatin as a coimmunoprecipitant. Employing extracts of cells overexpressing human stomatin, we found that stomatin bound to the glutathione-S-transferase (GST) fusion protein containing the COOH-terminal 42-amino acid segment of GLUT-1 but not to GST alone or a GST fusion protein containing the 66-amino acid central loop of GLUT-1. Rat stomatin cDNA was cloned by RT-PCR and found to be highly homologous to mouse (97%) and human (86%) stomatins. These results suggest that overexpression of stomatin results in a depression in the basal rate of glucose transport by decreasing the 'intrinsic' activity of GLUT-1, probably through protein-protein interaction. |
