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Monitoring Astrocyte Reactivity and Proliferation in Vitro Under Ischemic-Like Conditions
Published on: October 21, 2017
Hypoxic preconditioning increases iron transport rate in astrocytes
1School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, NT, Hong Kong.
Biochimica Et Biophysica Acta
|December 27, 2011
Summary
Hypoxic preconditioning (HP) boosts iron transport in astrocytes by increasing iron uptake and release proteins. This enhanced iron transport and cellular iron content may contribute to HP-induced neuroprotection.
Area of Science:
- Neuroscience
- Cell Biology
- Iron Metabolism
Background:
- Neuroprotection mechanisms from hypoxic preconditioning (HP) are not fully understood.
- Hypoxia-inducible factor-1 alpha (HIF-1alpha) is involved in HP-induced neuroprotection.
- HIF-1alpha regulates iron metabolism genes (TfR1, DMT1) in non-brain cells.
Purpose of the Study:
- To investigate if HP affects iron metabolism proteins in the brain.
- To determine if changes in these proteins are linked to HP-induced neuroprotection.
Main Methods:
- Assessed expression of HIF-1alpha, iron uptake (TfR1, DMT1), and iron release (ferroportin1) proteins in astrocytes after HP.
- Measured transferrin-bound iron (Tf-Fe) and non-transferrin-bound iron (NTBI) uptake and iron release.
- Analyzed cellular iron content and ferroportin1 expression regulation by HIF-1alpha.
Main Results:
- HP significantly increased HIF-1alpha, TfR1, DMT1, and ferroportin1 expression in astrocytes.
- HP enhanced Tf-Fe, NTBI uptake, and iron release, leading to increased cellular iron content.
- Ferroportin1 expression was significantly influenced by HIF-1alpha in astrocytes.
Conclusions:
- HP increases iron transport rate and cellular iron content in astrocytes.
- Enhanced astrocyte iron transport may be a mechanism underlying HP-induced neuroprotection.
- Ferroportin1 is likely a hypoxia-inducible gene in astrocytes.
