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Arctigenin Increases Hemeoxygenase-1 Gene Expression by Modulating PI3K/AKT Signaling Pathway in Rat Primary
Yeon-Hui Jeong1, Jin-Sun Park1, Dong-Hyun Kim2
1Department of Molecular Medicine, Tissue Injury Defense Research Center, Ewha Womans University Medical School, Seoul 158-710.
Biomolecules & Therapeutics
|December 10, 2014
Summary
The natural compound arctigenin reduces reactive oxygen species (ROS) in astrocytes by boosting antioxidant hemeoxygenase-1 (HO-1) expression through the PI3K/AKT pathway and Nrf2/ARE activation.
Area of Science:
- Neuroscience
- Biochemistry
- Pharmacology
Background:
- Reactive oxygen species (ROS) contribute to neurological damage.
- Hemeoxygenase-1 (HO-1) is a key endogenous antioxidant enzyme in the brain.
- Astrocytes play crucial roles in brain homeostasis and neuroprotection.
Purpose of the Study:
- To investigate the effect of arctigenin on ROS production in rat primary astrocytes.
- To elucidate the molecular mechanisms underlying arctigenin's antioxidant effects, focusing on HO-1 expression.
- To determine the involvement of the PI3K/AKT and Nrf2/ARE signaling pathways.
Main Methods:
- Primary rat astrocyte culture.
- Hydrogen peroxide (H2O2) treatment to induce ROS.
- Measurement of ROS production.
- Analysis of HO-1 mRNA and protein expression.
- Western blot analysis for protein levels and translocation.
- Electrophoretic mobility shift assay (EMSA) for DNA binding.
- Luciferase reporter assay for transcriptional activity.
- Pharmacological inhibition of PI3K/AKT pathway.
Main Results:
- Arctigenin significantly inhibited H2O2-induced ROS production in astrocytes.
- Arctigenin upregulated HO-1 mRNA and protein levels.
- Arctigenin promoted nuclear translocation and DNA binding of Nrf2/c-Jun to the HO-1 promoter's antioxidant response element (ARE).
- Arctigenin enhanced ARE-mediated transcriptional activity.
- Arctigenin increased the phosphorylation of AKT, indicating PI3K/AKT pathway activation.
- Inhibition of PI3K/AKT signaling abolished arctigenin-induced HO-1 expression and Nrf2/ARE activation.
Conclusions:
- Arctigenin exhibits neuroprotective effects by reducing oxidative stress in astrocytes.
- The PI3K/AKT signaling pathway mediates arctigenin's induction of HO-1 expression.
- Arctigenin modulates the Nrf2/ARE pathway, contributing to its antioxidant properties.
- Arctigenin represents a potential therapeutic agent for conditions involving oxidative stress in the brain.
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