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Chunghyuldan attenuates brain microglial inflammatory response
Kyong Nyon Nam1, Hoon-Ji Jung, Mi-Hyun Kim
1Department of Medical Science, Graduate School of East-West Medical Science, East-West Integrated Medical Science Research Center, Kyung Hee University, 1 Seochun, Yongin-si 446-701, Korea.
Abstract:
Microglial cells are the prime effectors in immune and inflammatory responses of the central nervous system (CNS). During pathological conditions, the activation of these cells helps restore CNS homeostasis. However, chronic microglial activation endangers neuronal survival through the release of various proinflammatory molecules and neurotoxins. Thus, negative regulators of microglial activation have been considered as potential therapeutic candidates to target stroke and neurodegenerative diseases. Chunghyuldan, a combinatorial drug consisting of Scutellariae Radix, Coptidis Rhizoma, Phellodendri Cortex, Gardeniae Fructus, and Rhei Rhizoma, has an inhibitory effect on stroke recurrence in patients with small-vessel disease. It has also been reported to confer antihypertensive, antihyperlipidemic, and antiinflammatory effects. The aim of this study was to examine whether Chunghyuldan suppresses microglial activation. Chunghyuldan was effective at inhibiting LPS-induced nitric oxide (NO) release from rat brain microglia. Real-time reverse transcriptase PCR analysis revealed that pretreatment of rat brain microglia with Chunghyuldan attenuated the LPS-induced expression of mRNAs encoding inducible NO synthase, tumor necrosis factor (TNF)-alpha, interleukin-1beta, and cyclooxygenase-2. In rat brain microglia, Chunghyuldan reduced the LPS-stimulated production of TNF-alpha and prostaglandin E2. In addition, Chunghyuldan significantly decreased LPS-induced phosphorylation of the ERK1/2 and p38 signaling proteins. These results suggest that Chunghyuldan provide neuroprotection by reducing the release of various proinflammatory molecules from activated microglia.
Insights
Chunghyuldan, a herbal medicine, effectively reduces inflammation in activated brain microglia. This suggests its potential for neuroprotection against conditions like stroke and neurodegenerative diseases.
Area of Science:
- Neuroscience
- Immunology
- Pharmacology
Background:
- Microglial cells are key players in central nervous system (CNS) inflammation.
- Chronic microglial activation can harm neurons, making them targets for treating stroke and neurodegenerative diseases.
- Chunghyuldan is a herbal formula with anti-inflammatory properties, potentially beneficial for CNS disorders.
Purpose of the Study:
- To investigate the effects of Chunghyuldan on microglial activation.
- To determine if Chunghyuldan can suppress the release of inflammatory mediators from activated microglia.
Main Methods:
- Rat brain microglia were treated with lipopolysaccharide (LPS) to induce activation.
- Chunghyuldan's effect on nitric oxide (NO) release was measured.
- Real-time reverse transcriptase PCR analyzed the expression of key inflammatory genes (iNOS, TNF-alpha, IL-1beta, COX-2).
- Production of TNF-alpha and prostaglandin E2 was quantified.
- Western blotting assessed the phosphorylation of ERK1/2 and p38 signaling pathways.
Main Results:
- Chunghyuldan significantly inhibited LPS-induced nitric oxide release.
- It attenuated the expression of mRNAs for inducible NO synthase, tumor necrosis factor-alpha, interleukin-1beta, and cyclooxygenase-2.
- Chunghyuldan reduced the production of TNF-alpha and prostaglandin E2.
- It decreased the phosphorylation of ERK1/2 and p38 signaling proteins.
Conclusions:
- Chunghyuldan suppresses microglial activation by reducing the release of pro-inflammatory molecules.
- These findings support Chunghyuldan's potential as a therapeutic agent for neuroprotection in CNS diseases.
