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Glucose transport in a murine mammary epithelial cell line
B L Bennett1, M R Grigor, C G Prosser
1Department of Biochemistry, University of Otago, Dunedin, New Zealand. brydon.l.bennett@am.pnu.com
Abstract:
The glucose transport systems of the COMMA-D cell line (a murine mammary epithelial cell line) were examined using 2-deoxyglucose as substrate. The kinetics and inhibition studies with other sugars including xylose suggested that the transport system had properties of both GLUT-1 and Glut-3. Subsequent analysis of mRNA transcripts using cDNAs for GLUT-1 to 4 showed that only GLUT-1 was expressed in the COMMA-D cells. The results highlight the fact that kinetic and substrate specificity are not sufficient, by themselves, for the identification and characterisation of GLUT isoforms in cultured cells.