Abstract |
Metallothionein-III ( MT-III), a metal- binding protein, is associated with resistance to neuronal injury. However, the underlying mechanism for its effects remains unclear. We therefore examined whether MT-III can induce VEGF expression and promote neuroprotective effects in brain endothelial bEND.3 cells. MT-III significantly induced VEGF mRNA and protein expression in bEND.3 cells in a dose- and time-dependent manner. Furthermore, MT-III treatment increased the stability of hypoxia-inducible factor 1alpha (HIF-1alpha) and stimulated transcription of a reporter gene under control of the VEGF promoter. MT-III also increased the accumulation of HIF-1alpha in nuclei and increased HIF-1alpha-binding to the VEGF promoter. MT-III increased PI3K/Akt and ERK1/2 phosphorylation according to Western blot analysis. However, pretreatment with PD98059 and LY294002 (ERK1/2 and Akt inhibitors) inhibited MT-III-induced stimulation of HIF-1alpha protein expression and VEGF production. These results suggest that MT-III upregulates VEGF production in brain endothelial cells by a HIF-1alpha-dependent mechanism.
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Authors | Hyung Gyun Kim, Yong Pil Hwang, Hye Gwang Jeong |
Journal | Biochemical and biophysical research communications
(Biochem Biophys Res Commun)
Vol. 369
Issue 2
Pg. 666-71
(May 02 2008)
ISSN: 1090-2104 [Electronic] United States |
PMID | 18295594
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- HIF1A protein, human
- Hypoxia-Inducible Factor 1, alpha Subunit
- Metallothionein 3
- Nerve Tissue Proteins
- Vascular Endothelial Growth Factor A
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Topics |
- Brain
(drug effects, metabolism)
- Cell Line
- Dose-Response Relationship, Drug
- Endothelial Cells
(drug effects, metabolism)
- Gene Expression
(drug effects, physiology)
- Humans
- Hypoxia-Inducible Factor 1, alpha Subunit
(metabolism)
- Metallothionein 3
- Nerve Tissue Proteins
(administration & dosage)
- Signal Transduction
(drug effects, physiology)
- Vascular Endothelial Growth Factor A
(metabolism)
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