한국임상수의학회지 (Journal of Veterinary Clinics)

  • 제31권6호
  • /
  • Pages.469-476
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  • 2014
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  • 1598-298X(pISSN)
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  • 2384-0749(eISSN)
한국임상수의학회 (The Korean Society of Veterinary Clinics)
권호 표지

RAW 264.7 세포에 있어 t10c12-CLA의 ROS를 통한 TNF-${\alpha}$ 생산 및 NF-${\kappa}B$ 활성 조절

Trans-10, cis-12 Conjugated Linoleic Acid Modulates Tumor Necrosis Factor-${\alpha}$ Production and Nuclear Factor-${\kappa}B$ Activation in RAW 264.7 Macrophages Through Formation of Reactive Oxygen Species

  • Park, So-Young (Laboratory of Veterinary Internal Medicine, Department of Veterinary Medicine, College of Veterinary Medicine, Chungbuk National University) ;
  • Kang, Byeong-Teck (Laboratory of Veterinary Dermatology, Department of Veterinary Medicine, College of Veterinary Medicine, Chungbuk National University) ;
  • Kang, Ji-Houn (Laboratory of Veterinary Internal Medicine, Department of Veterinary Medicine, College of Veterinary Medicine, Chungbuk National University) ;
  • Yang, Mhan-Pyo (Laboratory of Veterinary Internal Medicine, Department of Veterinary Medicine, College of Veterinary Medicine, Chungbuk National University)
  • 심사 : 2014.10.13
  • 발행 : 2014.12.31
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초록

본 연구는 염증상태에서의 CLA의 효과와 작용기전을 알아보기 위해 LPS-자극 RAW 264.7 macrophages에 있어 ROS 생성과 TNF-${\alpha}$ 생산, NF-${\kappa}B$ 및 $PPAR{\gamma}$ 활성을 검토하였다. t10c12-CLA는 LPS로 자극하지 않은 비염증시의 RAW 세포에서는 ROS 생성을 증가시켜 TNF-${\alpha}$ 생산을 유도하였으며, 이 효과는 $PPAR{\gamma}$ 활성화에 의존해서 NF-${\kappa}B$ 활성 증가에 의해 매개되었다. 반면, LPS로 자극한 염증조건의 RAW 세포에서는 t10c12-CLA가 $PPAR{\gamma}$ 활성화에 의존하지 않는 경로로 ROS 생성 및 과도한 TNF-${\alpha}$ 생산을 억제하였다. 본 결과로부터 CLA는 ROS 생성을 통해 TNF-${\alpha}$ 생산 및 NF-${\kappa}B$ 활성을 염증 유무에 따라 조절하는 것으로 사료되었다.

The aims of this study were to explore the effects of conjugated linoleic acid (CLA) on reactive oxygen species (ROS) production in lipopolysaccharide (LPS)-naïve and LPS-stimulated RAW 264.7 macrophages and to examine whether these effects affect the regulation of tumor necrosis factor-alpha (TNF-${\alpha}$) production, and nuclear factor-kappa B (NF-${\kappa}B$) and peroxisome proliferator-activated receptor gamma ($PPAR{\gamma}$) activation. Trans-10, cis-12(t10c12)-CLA increased the production of ROS, as well as TNF-${\alpha}$ in LPS-naïve RAW 264.7 cells. The CLA-induced TNF-${\alpha}$ production was suppressed by treatment of diphenyleneiodonium chloride (DPI), a NADPH oxidase inhibitor. In addition, CLA enhanced the activities of NF-${\kappa}B$ and $PPAR{\gamma}$ in LPS-naïve RAW 264.7 cells, and this effect was abolished with DPI treatment. LPS treatment increased ROS production, whereas CLA reduced LPS-induced ROS production. LPS increased both TNF-${\alpha}$ production and NF-${\kappa}B$ activity, whereas t10c12-CLA reduced TNF-${\alpha}$ production and NF-${\kappa}B$ activity in LPS-stimulated RAW 264.7 cells. DPI treatment suppressed LPS-induced ROS production and NF-${\kappa}B$ activity. Moreover, DPI enhanced the inhibitory effects of t10c12-CLA on TNF-${\alpha}$ production and NF-${\kappa}B$ activation in LPS-stimulated RAW 264.7 cells. However, neither t10c12-CLA nor DPI affected $PPAR{\gamma}$ activity in LPS-stimulated RAW 264.7 cells. Taken together, these data indicate that t10c12-CLA induces TNF-${\alpha}$ production by increasing ROS production in LPS-naïve RAW 264.7 cells, which is mediated by the enhancement of NF-${\kappa}B$ activity via $PPAR{\gamma}$ activation. By contrast, t10c12-CLA suppresses TNF-${\alpha}$ production by inhibiting ROS production and NF-${\kappa}B$ activation via a $PPAR{\gamma}$-independent pathway in LPS-stimulated RAW 264.7 cells. These results suggest that t10c12-CLA can modulate TNF-${\alpha}$ production and NF-${\kappa}B$ activation through formation of ROS in RAW 264.7 macrophages.

키워드

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