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Updated: May 1, 2026
Magnetic Isolation of Microglial Cells from Neonate Mouse for Primary Cell Cultures
Published on: July 25, 2022
Pheophytin a and chlorophyll a suppress neuroinflammatory responses in lipopolysaccharide and interferon-γ-stimulated
Sunyoung Park1, Jeong June Choi2, Bo-Kyung Park1
1Laboratory of Pathology, College of Korean Medicine, Daejeon University, Daejeon 300-716, Republic of Korea.
Aims:
Microglia-mediated inflammation is associated with pathogenesis of various neuronal disorders. This study investigated inhibitory effects of pheophytin a (PP) and chlorophyll a (CP) on neuroinflammation and underlying cellular mechanisms in microglia cells.
Main Methods:
BV2 murine microglia cells were stimulated by lipopolysaccharide (LPS, 100 ng/mL) and interferon (IFN)-γ (10 U/mL). The productions of nitric oxide (NO) and expressions of proinflammatory cytokines and chemokines were determined by ELISA and RT-PCR. Western blot and confocal microscopy were applied to analyze activation of transcription factors and mitogen activated protein kinase (MAPK).
Key Findings:
PP and CP significantly reduced the levels of NO, tumor necrosis factor (TNF)-α, interleukin (IL)-1β, IL-6 and chemokines including macrophage inhibitory protein (MIP)-1α, macrophage chemoattractant protein (MCP)-1 and IFN-γ inducible protein (IP)-10 in BV2 cells stimulated with LPS and IFN-γ (LI). The nuclear expression of p65 NF-κB was significantly suppressed, which was accompanied by reduced the levels of IFN-β, phospho-STAT-1, and interferon regulatory factor (IRF)-1. Activation of extracellular signal-regulated kinase (ERK) and c-Jun NH2-terminal kinase (JNK) but not p38 MAPK were prominently suppressed by PP and/or CP.
Significance:
PP and CP may suppress inflammatory responses by inhibiting NF-κB activation and type I IFN signaling pathway. These result suggested that PP and CP have potential as anti-inflammatory agents for microglia-mediated neuroinflammatory disorders.
Insights
Pheophytin a (PP) and chlorophyll a (CP) reduce neuroinflammation by inhibiting key inflammatory pathways in microglia. These compounds show potential as anti-inflammatory agents for neuronal disorders.
Area of Science:
- Neuroscience
- Immunology
- Pharmacology
Background:
- Microglia-mediated inflammation is a key factor in neurodegenerative diseases.
- Identifying novel anti-inflammatory agents is crucial for treating these disorders.
Purpose of the Study:
- To investigate the anti-neuroinflammatory effects of pheophytin a (PP) and chlorophyll a (CP).
- To elucidate the cellular mechanisms underlying the anti-inflammatory actions of PP and CP in microglia.
Main Methods:
- BV2 murine microglia cells were stimulated with lipopolysaccharide (LPS) and interferon-gamma (IFN-γ).
- Nitric oxide (NO), cytokine, and chemokine production were measured using ELISA and RT-PCR.
- Western blot and confocal microscopy assessed transcription factor and mitogen-activated protein kinase (MAPK) activation.
Main Results:
- PP and CP significantly decreased NO, TNF-α, IL-1β, IL-6, and chemokine levels.
- Suppression of p65 NF-κB nuclear expression was observed, alongside reduced IFN-β, phospho-STAT-1, and IRF-1.
- Activation of ERK and JNK MAPKs was inhibited by PP and/or CP.
Conclusions:
- PP and CP suppress inflammatory responses by inhibiting NF-κB and type I IFN signaling.
- These findings suggest PP and CP possess potential as therapeutic agents for microglia-mediated neuroinflammatory conditions.
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