Journal of Pharmacological Sciences
Online ISSN : 1347-8648
Print ISSN : 1347-8613
ISSN-L : 1347-8613
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Naltrexone Protects Against Lipopolysaccharide/D-Galactosamine–Induced Hepatitis in Mice
Chien-Chuan WangPao-Yun ChengYie-Jen PengEdwin SC WuHsiao-Ping WeiMao-Hsiung Yen
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2008 Volume 108 Issue 3 Pages 239-247

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Abstract

Naltrexone, an opioid receptor antagonist, has been claimed to have anti-inflammatory and immunomodulatory effects both in vitro and in vivo. Thus, the aim of this study was to evaluate the effects of naltrexone on acute hepatitis induced by intraperitoneal (i.p.) administration of lipopolysaccharide (LPS, 20 μg/kg)/D-galactosamine (D-gal, 700 mg/kg) in conscious ICR mice. Results demonstrated that post-treatment with naltrexone (20 mg/kg, i.p.) significantly attenuated the deleterious liver function in mice treated with LPS/D-gal. It was also found that naltrexone significantly inhibited the elevation of plasma tumor necrosis factor-α (TNF-α) caused by LPS/D-gal. The overproduction of nitric oxide (NO) and superoxide anions induced by LPS/D-gal were also significantly reduced by naltrexone. Moreover, infiltration of neutrophils into the liver of mice 12 h after treatment with LPS/D-gal was also decreased by naltrexone. In conclusion, the beneficial effects of naltrexone on LPS/D-gal–induced hepatitis result from its inhibition of pro-inflammatory factors and antioxidant effects. Thus, naltrexone is of therapeutic potential for treating liver injury.

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© The Japanese Pharmacological Society 2008
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