Journal of Veterinary Clinics (한국임상수의학회지)

The Korean Society of Veterinary Clinics (한국임상수의학회)
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Effect of trans-10, cis-12 Conjugated Linoleic Acid on Calcium-Dependent Reactive Oxygen Species and Nitric Oxide Production and Nuclear Factor-${\kappa}B$ Activation in Lipopolysaccharide-Stimulated RAW 264.7 Cells

LPS 자극 RAW 264.7 세포에 있어서 칼슘의존성 ROS와 NO 생산 및 NF-${\kappa}B$ 활성에 대한 CLA의 억제효과

  • Choi, Tae-Won (Department of Veterinary Medicine, College of Veterinary Medicine, Chungbuk National University) ;
  • Kang, Byeong-Teck (Department of Veterinary Medicine, College of Veterinary Medicine, Chungbuk National University) ;
  • Kang, Ji-Houn (Department of Veterinary Medicine, College of Veterinary Medicine, Chungbuk National University) ;
  • Yang, Mhan-Pyo (Department of Veterinary Medicine, College of Veterinary Medicine, Chungbuk National University)
  • Accepted : 2015.03.27
  • Published : 2015.04.30
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Abstract

Trans-10, cis-12-conjugated linoleic acid (t10c12-CLA) has been shown to participate in the regulation of anti-inflammatory effects. The objectives of this study were to examine the effects of t10c12-CLA on reactive oxygen species (ROS) and nitric oxide (NO) production and nuclear factor-kappaB (NF-${\kappa}B$) activation in lipopolysaccharide (LPS)-stimulated RAW 264.7 cells and to determine whether these effects were associated with change of intracellular calcium ion ($Ca^{2+}$). ROS production was increased in LPS-stimulated RAW 264.7 cells, and this effect was suppressed by 1,2-bis-(o-aminophenoxy) ethane-N,N,N',N'-tetraacetic acid-acetoxymethyl ester (BAPTA/AM), a calcium chelator. t10c12-CLA suppressed ROS production in LPS-stimulated RAW 264.7 cells, which was further more decreased by treatment with BAPTA/AM. These indicated that t10c12-CLA decreases $Ca^{2+}$-dependent ROS production in LPS-stimulated RAW 264.7 cells. Similarly, NF-${\kappa}B$ p65 DNA binding activity and NO production were decreased by treatment with either t10c12-CLA, BAPTA/AM, or t10c12-CLA and BAPTA/AM combination. However, there were no differences between t10c12-CLA and BAPTA/AM treatment in NO production of LPS-stimulated RAW 264.7 cells. These data indicate that t10c12-CLA inhibits the increases in ROS and NO production and the NF-${\kappa}B$ activation in LPS-stimulated condition. These results suggested that CLA exerts potent anti-inflammatory effects by suppression of LPS-induced ROS and NO production, and NF-${\kappa}B$ activationn via $Ca^{2+}$-dependent pathway.

염증상태에서의 CLA의 효과와 작용기전을 알아보기 위해 LPS로 자극한 RAW 264.7 세포에 있어서 ROS와 NO생산 및 NF-${\kappa}B$ 활성에 대한 t10c12-CLA의 효과를 검토하였다. 또한 이러한 효과가 세포질 내 칼슘이온의 변화와 관련이 있는지도 알아보았다. LPS 자극으로 ROS 생산은 증가하였고 이러한 증가는 칼슘결합제인 BAPTA/AM에 의해 감소하였다. t10c12-CLA 또한 LPS 자극 RAW 264.7 세포의 ROS 생산 증가를 억제시켰으며 BAPTA/AM과 함께 처리시 더욱 억제되었다. NO의 생산과 NF-${\kappa}B$ p65 활성도 t10c12-CLA, BAPTA/AM, t10c12-CLA와 BAPTA/AM의 동시처리 모두에서 현저하게 억제되었다. 이상의 결과로부터 염증 조건에서 CLA는 과도한 ROS와 NO의 생산 및 NF-${\kappa}B$의 활성을 칼슘 의존적으로 억제하여 항염증 효과를 발휘하는 것으로 생각되었다.

Keywords

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