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Published on: January 30, 2014
Macelignan inhibits the inflammatory response of microglia and regulates neuronal survival
Kankan Zong1, Xin Liu2, Zhou Sun1
1Institute for Regenerative Medicine, Yanbian University College of Medicine, Yanji, China.
Abstract:
Neuroinflammation is an important pathological process of neurodegenerative diseases, and microglial contributes to chronic inflammation and neuronal loss in progressive neurodegenerative. Therefore, regulating the inflammatory response of microglia could lead to the discovery of promising treatments for neurodegenerative diseases. In this study, we investigated the effects of the nutmeg plant seed extract, macelignan, on the inflammatory response of microglia and neuronal cell survival. We detected NO and iNOS using the Griess test and Western blotting. We measured phosphoinositide 3 kinase (PI3K)/Akt expression by Western blotting. The release of NO and inflammatory cytokines and the expression of iNOS decreased in a concentration-dependent manner, with an increase in macelignan concentration. PI3K/Akt phosphorylation levels decreased in a dose-dependent manner in lipopolysaccharide (LPS)-activated microglial cells after exposure to macelignan. We also demonstrated that macelignan improved HT22 cell viability, following exposure to a microglial-conditioned medium. Furthermore, macelignan inhibited microglial cell near neurons treated with a hypoxic conditioned medium. Finally, macelignan treatment reduced the expression of p27 and cyclin D1 in neurons cultured in an LPS-activated microglia-conditioned medium. Therefore, these results imply that macelignan can inhibit the inflammatory response of microglia and regulate neuronal survival through the PI3K/Akt pathway.
Insights
Macelignan, a nutmeg extract, reduces microglial inflammation and protects neurons by inhibiting the PI3K/Akt pathway. This suggests potential therapeutic applications for neurodegenerative diseases.
Area of Science:
- Neuroscience
- Pharmacology
- Cell Biology
Background:
- Neuroinflammation, driven by microglia, is central to neurodegenerative diseases.
- Targeting microglial inflammatory responses offers therapeutic potential for neurodegeneration.
Purpose of the Study:
- To investigate macelignan's effects on microglial inflammation and neuronal survival.
- To elucidate the underlying molecular mechanisms involving the PI3K/Akt pathway.
Main Methods:
- Assessed nitric oxide (NO) and inducible nitric oxide synthase (iNOS) via Griess assay and Western blotting.
- Measured phosphoinositide 3 kinase (PI3K)/Akt pathway activation using Western blotting.
- Evaluated neuronal viability and cell cycle markers in response to macelignan and conditioned media.
Main Results:
- Macelignan dose-dependently decreased NO release, inflammatory cytokines, and iNOS expression in activated microglia.
- Macelignan inhibited PI3K/Akt phosphorylation in lipopolysaccharide (LPS)-activated microglia.
- Macelignan enhanced neuronal cell viability and reduced neuronal cell cycle inhibitors (p27, cyclin D1) in inflammatory conditions.
Conclusions:
- Macelignan effectively suppresses microglial inflammatory responses.
- Macelignan promotes neuronal survival, potentially via modulation of the PI3K/Akt pathway.
- Macelignan demonstrates neuroprotective properties relevant to neurodegenerative disease treatment.
