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Maslinic Acid Protected PC12 Cells Differentiated by Nerve Growth Factor against β-Amyloid-Induced Apoptosis
Yu-wan Yang1,2, Chia-wen Tsai3, Mei-chin Mong4
1School of Medicine, China Medical University , Taichung City, Taiwan.
Abstract:
β-Amyloid peptide (Abeta) was used to induce apoptosis in PC12 cells differentiated by nerve growth factor, and the protective activities of maslinic acid (MA) at 2-16 μM were examined. Abeta treatment lowered Bcl-2 expression, raised Bax expression, and decreased cell viability. MA pretreatments decreased Bax expression, raised the Bcl-2/Bax ratio, and increased cell viability. MA pretreatments retained glutathione content and decreased subsequent Abeta-induced release of reactive oxygen species, tumor necrosis factor-α, interleukin (IL)-1β, and IL-6. Abeta treatment up-regulated protein expression of p47(phox), gp91(phox), mitogen-activated protein kinase, advanced glycation end product receptor (RAGE), and nuclear factor-κ B (NF-κB). MA pretreatments at 2-16 μM suppressed the expression of proteins including gp91(phox), p47(phox), p-p38, and NF-κB p65, at 4-16 μM down-regulated RAGE and NF-κB p50 expression, and at 8 and 16 μM reduced p-ERK1/2 expression. These novel findings suggest that maslinic acid is a potent compound against Abeta-induced cytotoxicity.
Insights
Maslinic acid (MA) protects against beta-amyloid (Abeta) induced cell death by reducing harmful inflammation and oxidative stress. This study shows MA as a potent compound for combating Abeta-induced cytotoxicity.
Area of Science:
- Neuroscience
- Cell Biology
- Pharmacology
Background:
- Beta-amyloid peptide (Abeta) is implicated in neuronal apoptosis.
- Maslinic acid (MA) is a natural compound with potential therapeutic properties.
Purpose of the Study:
- To investigate the protective effects of maslinic acid against Abeta-induced apoptosis in PC12 cells.
- To elucidate the molecular mechanisms underlying MA's protective activity.
Main Methods:
- PC12 cells were treated with nerve growth factor and then exposed to Abeta.
- Maslinic acid (MA) was administered as a pretreatment at varying concentrations (2-16 μM).
- Cell viability, apoptosis markers (Bcl-2, Bax), glutathione content, reactive oxygen species (ROS), inflammatory cytokines (TNF-α, IL-1β, IL-6), and key protein expressions (p47(phox), gp91(phox), MAPK pathway, RAGE, NF-κB) were assessed.
Main Results:
- Abeta treatment decreased cell viability and altered Bcl-2/Bax ratio, while MA pretreatment increased cell viability and restored the Bcl-2/Bax ratio.
- MA retained glutathione levels and reduced Abeta-induced ROS and inflammatory cytokine release.
- MA suppressed the expression of proteins involved in oxidative stress and inflammatory pathways, including p47(phox), gp91(phox), RAGE, and NF-κB.
Conclusions:
- Maslinic acid demonstrates significant protective effects against Abeta-induced cytotoxicity in neuronal cells.
- MA exerts its neuroprotective action by mitigating oxidative stress, reducing inflammation, and modulating key signaling pathways.
- These findings highlight maslinic acid as a promising therapeutic agent for conditions associated with Abeta toxicity.
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