Biomolecules & Therapeutics

The Korean Society of Applied Pharmacology (한국응용약물학회)
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Betulinic Acid Inhibits LPS-Induced MMP-9 Expression by Suppressing NF-kB Activation in BV2 Microglial Cells

  • Lee, Jae-Won (Department of Pharmacology, College of Medicine, Kangwon National University) ;
  • Choi, Yong-Joon (Department of Pharmacology, College of Medicine, Kangwon National University) ;
  • Kim, Song-In (Department of Pharmacology, College of Medicine, Kangwon National University) ;
  • Lee, Sue-Young (Department of Pharmacology, College of Medicine, Kangwon National University) ;
  • Kang, Sang-Soo (Department of Pharmacology, College of Medicine, Kangwon National University) ;
  • Kim, Nam-Ho (Department of Pharmacology, College of Medicine, Kangwon National University) ;
  • Kwon, Yong-Soo (College of Pharmacy, Kangwon National University) ;
  • Lee, Hee-Jae (Department of Pharmacology, College of Medicine, Kangwon National University) ;
  • Chun, Wan-Joo (Department of Pharmacology, College of Medicine, Kangwon National University) ;
  • Kim, Sung-Soo (Department of Pharmacology, College of Medicine, Kangwon National University)
  • Received : 2011.03.25
  • Accepted : 2011.09.15
  • Published : 2011.10.30
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Abstract

Aberrant activation of microglia has been reported to cause neuronal damages by releasing a variety of pro-inflammatory cytokines. Besides where microglia become active, damages have been also observed in remote places, which is considered due to the migration of activated microglia. Therefore, an agent that could suppress abnormal activation of microglia and their subsequent migration might be valuable in activated microglia-related brain pathologies. The objective of the present study was to evaluate anti-inflammatory effects of betulinic acid on lipopolysaccharide (LPS)-stimulated BV2 microglial cells. Pretreatment of betulinic acid significantly attenuated LPS-induced NO production and protein expression of iNOS. Betulinic acid also significantly suppressed LPS-induced release and expression of cytokines such as TNF-${\alpha}$ and IL-$1{\beta}$. Furthermore, betulinic acid significantly uppressed LPS-induced MMP-9 expression, which has been suggested to play an important role in the migration of activated microglia. In order to understand the possible mechanism by which betulinic acid suppresses LPS-induced cytokine production and migration of microglia, the role of NF-kB, a major pro-inflammatory transcription factor, was examined. Betulinic acid significantly suppressed LPS-induced degradation of IKB, which retains NF-kB in the cytoplasm. Therefore, nuclear translocation of NF-kB upon LPS stimulation was significantly suppressed with betulinic acid. Taken together, the present study for the first time demonstrates that betulinic acid possesses anti-inflammatory activity through the suppression of nuclear translocation of NF-kB in BV2 microglial cells.

Keywords

References

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