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Vitamin E binding protein afamin protects neuronal cells in vitro
M Heiser1, B Hutter-Paier, L Jerkovic
1JSW Research GmbH, Graz, Austria.
Journal of Neural Transmission. Supplementum
|November 29, 2002
Summary
Afamin, a plasma glycoprotein, protects brain cells from death. It enhances neuronal survival both alone and with vitamin E, suggesting significant neuroprotective potential.
Area of Science:
- Neuroscience
- Biochemistry
- Cell Biology
Background:
- Afamin is an 87 kDa human plasma glycoprotein that binds vitamin E (alpha-tocopherol).
- Its role in neuronal health was previously uncharacterized.
Purpose of the Study:
- To investigate the in vitro effects of Afamin on neuronal cells.
- To determine if Afamin possesses neuroprotective properties independently of vitamin E.
Main Methods:
- Isolated cortical chicken neurons were cultured under apoptosis-inducing low serum conditions.
- Neurons were exposed to oxidative stress using H2O2 or beta-amyloid peptide(25-35).
- Effects of native Afamin, vitamin E-loaded Afamin (Afamin+), and vitamin E were assessed.
Main Results:
- Afamin and vitamin E synergistically enhanced cortical neuron survival under apoptotic conditions.
- Afamin alone demonstrated neuroprotective activity against both low serum and oxidative stress.
- These findings indicate Afamin protects neurons through mechanisms beyond vitamin E transport.
Conclusions:
- Afamin exhibits significant neuroprotective activity in vitro.
- This protection is mediated partly by its interaction with vitamin E and also by intrinsic properties.
- Afamin represents a potential therapeutic target for neurodegenerative conditions.