Related Experiment Videos
Glycogen in astrocytes: possible function as lactate supply for neighboring cells
R Dringen1, R Gebhardt, B Hamprecht
1Physiologisch-chemisches Institut der Universität, Tübingen Germany.
Brain Research
|October 1, 1993
Summary
Astrocyte glycogen serves as a lactate store, not a glucose store, in the brain. Studies show astrocytes primarily release lactate, even when metabolizing mannose or during glucose deprivation.
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- Astrocyte glycogen's role in brain energy metabolism is not fully understood.
- Understanding glycogen metabolism is crucial for brain function and energy homeostasis.
Purpose of the Study:
- To elucidate the function of astrocyte glycogen in the brain.
- To investigate the metabolic fate of glucosyl residues from astrocyte glycogen.
Main Methods:
- Utilized astroglia-rich primary cultures from newborn rat brains.
- Deprived cells of glucose and observed glycogen depletion.
- Analyzed medium for glucose and lactate production, using gluconolactone and 2-deoxyglucose to differentiate lactate sources.
Main Results:
- Astroglial cells rapidly depleted glycogen upon glucose deprivation.
- Cells released only lactate, not glucose, into the medium, even when using mannose.
- Glycogen breakdown contributed significantly to the total lactate released by the cells.
Conclusions:
- Astrocyte glycogen functions primarily as a store for lactate.
- Astrocyte glycogen is not a significant store for glucose release in the brain.