Biomolecules & Therapeutics

The Korean Society of Applied Pharmacology (한국응용약물학회)
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The Methanol Extract of Azadirachta indica A. Juss Leaf Protects Mice Against Lethal Endotoxemia and Sepsis

  • Kim, Woong-Hyun (Department of Infection Biology, Zoonosis Research Center, Wonkwang University School of Medicine) ;
  • Song, Hyun-Ok (Department of Infection Biology, Zoonosis Research Center, Wonkwang University School of Medicine) ;
  • Jin, Chun-Mei (Department of Infection Biology, Zoonosis Research Center, Wonkwang University School of Medicine) ;
  • Hur, Jong-Moon (Institute of Oriental Medicine Scientifi cation, Globalherb Co., Ltd.) ;
  • Lee, Hwa-Sung (Institute of Oriental Medicine Scientifi cation, Globalherb Co., Ltd.) ;
  • Jin, Han-Yong (Department of Infection Biology, Zoonosis Research Center, Wonkwang University School of Medicine) ;
  • Kim, Sung-Yeon (Institute of Pharmaceutical Research and Development, College of Pharmacy, Wonkwang University) ;
  • Park, Hyun (Department of Infection Biology, Zoonosis Research Center, Wonkwang University School of Medicine)
  • Received : 2011.05.19
  • Accepted : 2011.11.07
  • Published : 2012.01.31
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Abstract

In the present study, the inhibitory effect of neem leaf extract (NLE) on lipopolysaccaride (LPS)-induced nitric oxide (NO) and tumor necrosis factor-${\alpha}$ (TNF-${\alpha}$) production was examined both in vitro and in vivo. In vitro study revealed that NLE treatment ($100{\mu}g/ml$) inhibits LPS (100 ng/ml)-induced NO production by 96% and TNF-${\alpha}$ production by 32%. The reduction in NO production is probably conferred by the complete suppression of inducible nitric oxide synthase (iNOS) expression. Interestingly, in vivo NLE significantly improved the survival rate of mice in an experimental sepsis model. Administration of NLE (100 mg/kg) 24 h before LPS treatment (20 mg/kg) improved the survival rate of mice by 60%. The inhibition of plasma NO and TNF-${\alpha}$ production by NLE is likely to account for the improved survival of mice. Our results suggest that NLE may present a promising avenue in the development of therapeutic agents for the treatment of inflammatory diseases.

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