Clinical and Experimental Pediatrics

대한소아청소년과학회 (The Korean Pediatric Society)
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활성화된 자연살상 T 세포(NKT)에서 생성된 사이토카인에 의한 신경모세포종의 세포독성에 관한 연구

The study on cytotoxicity of cytokines produced by the activated human NKT cells on neuroblastoma

  • 조진영 (원광대학교 의과대학 소아과학교실) ;
  • 윤영욱 (원광대학교 의과대학 소아과학교실) ;
  • 윤향석 (원광대학교 의과대학 소아과학교실) ;
  • 김종덕 (원광대학교 의과대학 소아과학교실) ;
  • 최두영 (원광대학교 의과대학 소아과학교실)
  • Cho, Jin Young (Department of Pediatrics, School of Medicine, Wonkwang University) ;
  • Yoon, Young Wook (Department of Pediatrics, School of Medicine, Wonkwang University) ;
  • Yoon, Hyang Suk (Department of Pediatrics, School of Medicine, Wonkwang University) ;
  • Kim, Jong Duk (Department of Pediatrics, School of Medicine, Wonkwang University) ;
  • Choi, Du Young (Department of Pediatrics, School of Medicine, Wonkwang University)
  • 투고 : 2005.11.22
  • 심사 : 2005.12.30
  • 발행 : 2006.04.15
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초록

목 적 : ${\alpha}$-Galactosylceramide (GalCer)로 자극한 자연살상 T 세포(NKT)는 CD1d 및 T 세포 수용체(T cell receptor) 의존적으로 일부 백혈병에서 항암효과를 발현하나, CD1d음성인 신경모세포종에서는 세포독성을 유도할 수 없다. 이들 NKT세포의 활성화 시 분비되는 많은 양의 사이토카인의 직접적인 항암효과에 대해서는 소수의 보고가 있다. 본 연구에서는 hCD1d/${\alpha}$-GalCer tetramer로 NKT세포를 자극하여 얻은 상청액(supernatant)을 이용하여 NKT세포에 의한 신경모세포종의 치료적 접근의 가능성을 알아보았다. 방 법 : 신경모세포종 세포 주를 IMDM 배지에 배양하였고, NKT세포에서 분비되는 사이토카인 양은 cytometric bead array (CBA)분석으로 측정하였다. 세포 생존율은 calcein-AM 형광물질을 이용하여 digital image microscopy scanning (DIMSCAN)으로 측정하였고 특이 세포고사(specific apoptosis)는 annexin V and 7-AAD 염색 후 유식세포분석기를 통하여 산출하였다. 결 과 : 활성화된 NKT세포는 많은 양의 IL-2, IL-4, INF-${\gamma}$와 TNF-${\alpha}$을 분비하였다. NKT 자극 후 얻어진 상청액은 8개의 신경모세포종 세포 주 중 4개에서 의미있는 세포독성을 나타냈으며, 그 기전은 annexin-V 염색이나 pancaspase 억제제의 전 처치 실험으로 세포고사을 통하여 유도됨을 알 수 있었다. 그리고 이들 세포고사 유도는 anti-TNF-${\alpha}$, anti-IFN-${\gamma}$ 중화항체의 단독투여 시 현저히 감소하였고 동시투여 시에는 완전하게 억제되었다. 결 론 : NKT 세포의 활성화에 의해 분비된 IFN-${\gamma}$와 TNF${\alpha}$가 일부 신경모세포종 세포 주에서 협동적 세포 독성을 유도하였다.

Purpose : ${\alpha}$-Galactosylceramide (${\alpha}$-GalCer)-stimulated human $V{\alpha}24$ natural killer T (NKT) cells exert antitumor activity against some leukemia in a CD1d dependent and TCR-mediated manner, but could not kill CD1d - negative neuroblastoma (NB) cells. There are few reports about the direct antitumor effect of highly secreted cytokines by these cells on activation. In this study, using a cell-free supernatant (SPN) collected from plate bound hCD1d/${\alpha}$ GalCer tetramers-stimulated NKT cells, we examined whether they could be helpful in the immunotherapeutic treatment of NB. Methods : Cells were cultured in IMDM. The cytokines produced by NKT cells were measured with Cytometric Bead Array (CBA) analysis. Cell viability was evaluated by calcein-AM fluorescence with digital image microscopy scanning (DIMSCAN). The percentage of specific apoptosis was calculated by flow cytometric detection of apoptosis using annexin V and 7-AAD. Results : The activated NKT cells secreted high levels of IL-2, INF-${\gamma}$, TNF-${\alpha}$. The SPN was significantly cytotoxic against four out of eight tested NB cell lines, through mainly apoptosis as evidenced by annexin-V staining and inhibition with the pretreatment of pancaspase blocker. This apoptosis was significantly inhibited when anti-TNF-${\alpha}$ and anti-IFN-${\gamma}$ neutralizing mAbs were used separately and it was completely abolished when the two mAbs were combined. Conclusion : IFN-${\gamma}$ and TNF-${\alpha}$ produced by NKT cells could exert synergistically direct antitumor activity through apoptosis on some NB cell lines.

키워드

과제정보

연구 과제 주관 기관 : wonkwang university

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