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Published on: May 2, 2018
Anti-inflammatory effects of LK-3, on LPS-induced sepsis in rats
Wen-Hui Tsai1, Pao-Yun Cheng, Yen-Mei Lee
1Division of Genetics and Metabolism, Department of Pediatrics, Chi Mei Foundation Medical Center, Tainan, Taiwan, Republic of China.
Abstract:
Dextromethorphan (DM), an antitussive agent, has been shown to have anti-inflammatory and immunomodulatory effects in vitro. Thus, the aim of this study was to evaluate the effects of LK-3, an analog of DM, on sepsis induced by intravenous (i.v.) administration of lipopolysaccharide (LPS; 10 mg/ kg) in anesthetized Wistar rats. Results demonstrated that post-treatment with LK-3 (4 mg/kg, i.v.) significantly attenuated the deleterious hemodynamic changes (e.g., hypotension and bradycardia) in rats treated with LPS. Meanwhile, LK-3 (4 mg/kg) significantly inhibited the elevation of plasma tumor necrosis factor-alpha, as well as values of glutamate-oxalacetate transaminase (GOT) and glutamate-pyruvate transaminase (GPT) caused by LPS. The induction of inducible NO synthase and the overproduction of NO and superoxide anions by LPS were also reduced by post-treatment of LK-3. Moreover, infiltration of neutrophils into the lungs and liver of rats 8 h after treatment with LPS was also reduced by post-treatment with LK-3. In conclusion, the beneficial effects of LK-3 on LPS-induced sepsis resulted from its anti-inflammatory and antioxidant effects.
Insights
LK-3, a dextromethorphan analog, effectively combats sepsis in rats by reducing inflammation and oxidative stress. This study shows its potential in treating sepsis-induced organ damage and hemodynamic instability.
Area of Science:
- Pharmacology
- Immunology
- Toxicology
Background:
- Dextromethorphan (DM) exhibits anti-inflammatory and immunomodulatory properties in vitro.
- Sepsis, a life-threatening condition, is characterized by dysregulated immune responses and organ dysfunction.
Purpose of the Study:
- To investigate the therapeutic effects of LK-3, a DM analog, on lipopolysaccharide (LPS)-induced sepsis in a rat model.
- To evaluate LK-3's impact on hemodynamic changes, inflammatory markers, and organ damage associated with sepsis.
Main Methods:
- Sepsis was induced in Wistar rats via intravenous lipopolysaccharide (LPS) administration.
- Rats received post-treatment with LK-3 (4 mg/kg, i.v.) to assess its protective effects.
- Hemodynamic parameters, plasma cytokine levels (TNF-α), liver enzymes (GOT, GPT), nitric oxide (NO) production, and neutrophil infiltration were measured.
Main Results:
- LK-3 treatment significantly attenuated LPS-induced hypotension and bradycardia.
- LK-3 inhibited the elevation of plasma tumor necrosis factor-alpha, GOT, and GPT levels.
- The drug reduced inducible nitric oxide synthase (iNOS) expression, nitric oxide (NO) and superoxide anion overproduction, and neutrophil infiltration in the lungs and liver.
Conclusions:
- LK-3 demonstrates significant anti-inflammatory and antioxidant effects in an LPS-induced sepsis model.
- These properties contribute to the observed beneficial effects of LK-3 in mitigating sepsis-induced complications.
- LK-3 shows promise as a potential therapeutic agent for sepsis.
