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Transcripts for the high and low affinity hexose transporters in rat myoblasts
The Journal of Biological Chemistry
|November 5, 1993
Summary
This study investigated glucose transporter (GLUT) gene expression in rat L6 myoblasts, finding GLUT 3 linked to high-affinity transport and GLUT 4 to low-affinity transport. GLUT 1 was present but non-functional.
Area of Science:
- Molecular Biology
- Cell Physiology
- Biochemistry
Background:
- Glucose transporters (GLUTs) are crucial for cellular glucose uptake.
- L6 myoblasts exhibit distinct high-affinity (HAHT) and low-affinity (LAHT) hexose transport systems.
- Understanding the specific GLUT isoforms involved in these transport systems is essential for metabolic research.
Purpose of the Study:
- To examine the relationship between GLUT transcript levels and hexose transport affinity in L6 myoblasts.
- To identify the specific GLUT isoforms responsible for HAHT and LAHT in these cells.
- To investigate the functionality of GLUT 1 in glucose-grown L6 myoblasts.
Main Methods:
- Analysis of GLUT transcript levels using molecular techniques.
- Assessment of hexose transport activity in L6 myoblasts and their mutants.
- Correlation of GLUT transcript expression with transporter activity under various conditions.
Main Results:
- GLUT 3 transcript levels correlated with HAHT activity; mutants showed reduced GLUT 3 and HAHT.
- GLUT 4 transcripts (2.8 and 1.4 kb) correlated with LAHT activity; LAHT- mutants lacked GLUT 4.
- GLUT 1 transcript and transporter were detected in HAHT-LAHT- mutants but were non-functional.
Conclusions:
- GLUT 3 and GLUT 4 transcripts likely code for or regulate HAHT and LAHT transporters, respectively.
- The GLUT 1 transporter is not responsible for the observed HAHT and LAHT activities in glucose-grown L6 myoblasts.
- These findings elucidate the molecular basis of differential glucose transport in muscle cells.