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Apamin Suppresses LPS-Induced Neuroinflammatory Responses by Regulating SK Channels and TLR4-Mediated Signaling
Jihyun Park1, Kyung Mi Jang2, Kwan-Kyu Park1
1Department of Pathology, College of Medicine, Catholic University of Daegu, Daegu 42472, Korea.
Abstract:
Neuroinflammation plays a vital role in neurodegenerative conditions. Microglia are a key component of the neuroinflammatory response. There is a growing interest in developing drugs to target microglia and thereby control neuroinflammatory processes. Apamin (APM) is a specifically selective antagonist of small conductance calcium-activated potassium (SK) channels. However, its effect on neuroinflammation is largely unknown. We examine the effects of APM on lipopolysaccharide (LPS)-stimulated BV2 and rat primary microglial cells. Regarding the molecular mechanism by which APM significantly inhibits proinflammatory cytokine production and microglial cell activation, we found that APM does so by reducing the expression of phosphorylated CaMKII and toll-like receptor (TLR4). In particular, APM potently suppressed the translocation of nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB)/signal transducer and activator of transcription (STAT)3 and phosphorylated mitogen-activated protein kinases (MAPK)-extracellular signal-regulated kinase (ERK). In addition, the correlation of NF-κB/STAT3 and MAPK-ERK in the neuroinflammatory response was verified through inhibitors. The literature and our findings suggest that APM is a promising candidate for an anti-neuroinflammatory agent and can potentially be used for the prevention and treatment of various neurological disorders.
Insights
Apamin (APM) effectively reduces neuroinflammation by inhibiting microglial activation and pro-inflammatory cytokine release. This suggests APM
Area of Science:
- Neuroscience
- Immunology
- Pharmacology
Background:
- Neuroinflammation is a critical factor in neurodegenerative diseases.
- Microglia are central to the neuroinflammatory response.
- Targeting microglia offers a therapeutic strategy for neuroinflammation.
Purpose of the Study:
- To investigate the effects of Apamin (APM) on microglial activation and neuroinflammation.
- To elucidate the molecular mechanisms underlying APM's anti-neuroinflammatory actions.
Main Methods:
- Examined APM's effects on lipopolysaccharide (LPS)-stimulated BV2 and rat primary microglial cells.
- Analyzed molecular pathways including CaMKII, TLR4, NF-κB, STAT3, and MAPK-ERK signaling.
- Utilized inhibitors to verify the role of NF-κB/STAT3 and MAPK-ERK pathways.
Main Results:
- APM significantly inhibited pro-inflammatory cytokine production and microglial activation.
- APM reduced the expression of phosphorylated CaMKII and TLR4.
- APM suppressed the translocation of NF-κB/STAT3 and phosphorylated MAPK-ERK.
Conclusions:
- APM demonstrates potent anti-neuroinflammatory properties.
- APM acts by modulating key signaling pathways involved in microglial activation.
- APM is a potential therapeutic candidate for neurological disorders.
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