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Evidence for ascorbic acid transport system in rat brain capillaries.
Y Ziya Ziylan1, A Sarper Diler, Jeanne-Marie Lefauconnier
1Department of Physiology, Istanbul Medical Faculty, Istanbul University, Istanbul, Turkey. ziziylan@yahoo.com
The International Journal of Neuroscience
|December 2, 2005
Summary
Ascorbic acid (vitamin C) uptake by brain capillaries is not fully understood. This study shows brain capillary endothelial cells actively transport and accumulate vitamin C, crucial for brain health.
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- Ascorbic acid (vitamin C) is vital for brain function.
- Its transport across the blood-brain barrier (BBB) via brain capillaries is not well-defined.
Purpose of the Study:
- To investigate the uptake mechanisms of ascorbic acid by brain capillaries and choroid plexus.
- To determine if specific transport systems facilitate ascorbic acid entry into brain cells.
Main Methods:
- In vitro isolation of rat choroid plexus and cerebral microvessels.
- Time-course studies of ascorbic acid incorporation.
- Assessing Na+-dependence and saturability of uptake.
- Radioactivity measurement using liquid scintillation counting.
Main Results:
- Ascorbic acid uptake by choroid plexus and endothelial cells increased linearly up to 30 minutes.
- The transport process was found to be sodium-independent.
- Ascorbic acid transport demonstrated saturation kinetics, indicating a carrier-mediated process.
Conclusions:
- Brain capillary endothelial cells possess mechanisms to transport and accumulate ascorbic acid.
- These cells play a significant role in regulating vitamin C concentration within the brain.
- This highlights a potential mechanism for maintaining cerebral ascorbic acid homeostasis.