Journal of Marine Bioscience and Biotechnology (한국해양바이오학회지)

The Korean Society for Marine Biotechnology (한국해양바이오학회)
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Carpomitra costata Extract Alleviates Lipopolysaccharide-induced Neuroinflammatory Responses in BV2 Microglia through the Inactivation of NF-κB Associated with the Blockade of the TLR4 Pathway and ROS Generation

  • Park, Cheol (Division of Basic Sciences, College of Liberal Studies, Dong-eui University) ;
  • Cha, Hee-Jae (Department of Parasitology and Genetics, Kosin University College of Medicine) ;
  • Hong, Su-Hyun (Department of Biochemistry, Dong-eui University College of Korean Medicine) ;
  • Kim, Suhkmann (Department of Chemistry, College of Natural Sciences, Pusan National University) ;
  • Kim, Heui-Soo (Department of Biological Sciences, College of Natural Sciences, Pusan National University) ;
  • Choi, Yung Hyun (Department of Biochemistry, Dong-eui University College of Korean Medicine)
  • Received : 2020.05.03
  • Accepted : 2020.05.11
  • Published : 2020.06.30
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Abstract

In this study, we investigated the inhibitory potential of an ethanol extract of Carpomitra costata (EECC) (Stackhouse) Batters, a brown alga, against neuroinflammatory responses in lipopolysaccharide (LPS)-stimulated BV2 microglia. Our results showed that EECC significantly suppressed the LPS-induced secretion of pro-inflammatory mediators, including nitric oxide (NO) and prostaglandin E2, with no significant cytotoxic effects. EECC also inhibited the LPS-induced expression of their regulatory enzymes, such as inducible NO synthase and cyclooxygenase-2. In addition, EECC downregulated the LPS-induced expression and production of the proinflammatory cytokines, tumor necrosis factor-α and interleukin-1β. In the mechanistic assessment of the antineuroinflammatory effects, EECC was found to inhibit the nuclear translocation and DNA binding of nuclear factor-kappa B (NF-κB) by disrupting the degradation of the κB-α inhibitor in the cytoplasm. Moreover, EECC effectively suppressed the enhanced expression of Toll-like receptor 4 (TLR4) and myeloid differentiation factor 88, as well as the binding of LPS to TLR4 in LPS-treated BV2 cells. Furthermore, EECC markedly reduced the LPS-induced generation of reactive oxygen species (ROS), demonstrating a strong antioxidative effect. Collectively, these results suggest that EECC repressed LPS-mediated inflammatory action in the BV2 microglia through the inactivation of NF-κB signaling by antagonizing TLR4 and/or preventing ROS accumulation. While further studies are needed to fully understand the anti-inflammatory effects associated with the antioxidant activity of EECC, the current findings suggest that EECC has a potential advantage in inhibiting the onset and treatment of neuroinflammatory diseases.

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References

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