Journal of Veterinary Clinics (한국임상수의학회지)

The Korean Society of Veterinary Clinics (한국임상수의학회)
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Immunoenhancing Effects of Conjugated Linoleic Acid on Chemotactic Activity of Porcine Peripheral Blood Polymorphonuclear Cells

돼지 말초혈액 다형핵 백혈구의 유주성에 있어서 conjugated linoleic acid의 면역증강효과

  • Kim, Ju-hyang (Laboratory of Veterinary Internal Medicine, College of Veterinary Medicine and Research Institute of Veterinary Medicine) ;
  • Chung, Chung-soo (Department of Animal Science, Chungbuk National University) ;
  • Lee, Chul-young (Department of International Livestock Industry, Chinju National University) ;
  • Yang, Mhan-pyo (Department of Animal Science, Chungbuk National University)
  • Published : 2003.03.01
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Abstract

Immunoenhancing effects of conjugated linoleic acid (CLA) isomers (l0t-l2c CLA, 9c-11t CLA, CLA mixture, 9c-11c CLA and 9t-11t CLA) on chemotactic activity of porcine peripheral blood polymorphonuclear cells (PMN) were examined. The chemotactic activity of PMN was evaluated by a modified Boyden chamber assay. CLA isomers at higher concentration of 50 to 200$\mu$M exhibited a low viability of cells by trypan blue exclusion. CLA isomers were used at concentration of 20uM showing no cytotoxic effect and high cell viability. CLA isomers themselves were not active or slight chemotactic for PMN. But culture supernatant from mononuclear cells (MNC) treated with 10t-12c CLA, 9c-11t CLA and CLA mixture except for 9c-11c. CLA and 9t-11t CLA enhanced remarkably chemotactic activity or porcine PMN PMN migration by culture supernatant from MNC treated with CLA mixture was found to be true chemotaxis by checkboard assay. This migration was also induced by porcine recombinant interleukin (rIL)-8. PMN chemotaxis caused both culture supernatant from MNC treated with CLA mixture and porcine rIL-8 was inhibited in a dose-dependent manner by addition of anti-porcine IL-8 polyclonal antibody. Therefore, these results strongly suggested that CLA (10t-12c CLA, 9c-11t CLA and CLA mixture) could stimulate porcine MNC to release and IL-8 like chemotactic activity.

돼지 말초혈액 다형핵 백혈구(polymorphonuclear cell; PMN)의 유주성에 있어서 conjugated linoleic acid(CLA) 이성체(CLA mixture, 10t-12c CLA, 9c-11t CLA, 9c-11c CLA 및 9t-11t CLA)의 면역증강 효과를 검토하였다. PMN에 대한 유주성은 Boyden chamber 변법으로 측정하였다. CLA 이성체들을 고농도(50∼200μM)로 사용하였을 경우 말초혈액 단핵구 세포(mononuclear cell; MNC) 및 PMN의 cell viability가 감소되거나 세포가 사멸하였다. 따라서 cell viability가 높고 세포독성을 나타내지 않는 20μM 농도로 유주활성 실험을 하였다. CLA 이성체들은 돼지 말초혈액 PMN의 유주활성에 직접적인 효과는 없었다. CLA 이성체로 배양한 MNC의 배양상층액 중 CLA mixture, 10t-12c CLA 및 9c-11t CLA 처리군에서는 PMN의 유주활성이 현저하게 증강되었으나 9c-11c CLA 및 9t-11t CLA로 배양한 MNC 배양상층액에서는 PMN의 유주활성이 나타나지 않았다. 이러한 유주성 증강효과는 checkerboard assay를 실시한 결과 진성의 유주활성이었다. 유주성 인자인 porcine recombinant (pr) interleukin(IL)-8을 이용하여 돼지 PMN에 대한 유주성을 검토한 결과, pr IL-8에 의한 PMN의 유주활성은 CLA로 배양한 MNC 배양상층액에 의한 것과 동등한 활성을 보였다. 또한 CLA로 배양한 MNC 배양상층액의 PMN에 대한 유주성을 anti-pr IL-8pAb를 사용하여 중화반응을 실시한 결과, CLA mixture로 배양한 MNC 배양상층액에 의해 증가된 PMN의 유주활성은 anti-pr IL-8 pAb 첨가에 의해 억제되어, 본 유주활성은 MNC에서 분비되는 IL-8으로 인한 것임을 강하게 시사하였다. 이상의 결과로부터 CLA 중 CLA mixture, 10t-12c CLA 및 9c-11t CLA 이성체가 돼지 말초혈액 다형핵 백혈구의 유주활성에 증강효과를 가지고 있으며, 이러한 증강효과는 CLA로 자극된 MNC에 의해 생성되는 IL-8 인자에 의한 것임을 알 수 있었다.

Keywords

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