Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Effects of PGA-LM on CD4+CD25+foxp3+ Treg Cell Activation in Isolated CD4+ T Cells in NC/Nga Mice

NC/Nga 생쥐에서 분리한 T 세포에서 foxp3+ 세포 활성화에 대한 PGA-LM의 효과

  • Jang, Soon-Nam (Department of Bioengineering, Graduate School at Konkuk University) ;
  • Kim, Kum-Lan (Department of Bioengineering, Graduate School at Konkuk University) ;
  • Kang, Sang-Mo (Department of Bioengineering, Graduate School at Konkuk University)
  • 장순남 (건국대학교 대학원 생물공학과) ;
  • 김금란 (건국대학교 대학원 생물공학과) ;
  • 강상모 (건국대학교 대학원 생물공학과)
  • Received : 2009.03.04
  • Accepted : 2009.05.13
  • Published : 2009.06.28
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Abstract

Poly-$\gamma$-glutamic acid ($\gamma$-PGA) was mixed natural flora of Bacillus subtilis, contaminated from cooked soybeans. Also, it was performed to find out the antiallergic activity by using NC/Nga mice, in vitro. The $\gamma$-PGA (PGA-HM : PGA-high molecular weight), Molecular weight 300 kDa, was decomposed and made PGA-LM (PGA-low molecular weight) which has molecular weight below 30 kDa by sonication. Therefore, it was same result between PGA-HM and PGA-LM, and reported PGA-LM as basic result. We found that PGA-LM contains antiallergic efficacy that inhibit B cells and Th2 cells activation from isolated CD4+T cells in NC/Nga atopic dermatitis model mice, and not show a cytotoxicity in the hFCs. To investigate the effects of these PGA-LM in vitro, isolation of splenic B cell and CD4+ T cells in atopic dermatitis mice were used. To elucidate the role of PGA-LM in anti-CD40+ interleukin-4 (IL-4)-mediated B-cell activation, showed that the capacity of B cells to expression IL-$1\beta$, IL-6, and TNF-$\alpha$ mRNA down-regulated, and IL-10 mRNA up-regulation by PGA-LM treatment, but it had no effect on TGF-$\beta$ expression. In addition to CD4+IFN-$\gamma$+ and CD4+CD25+foxp3+, the functions of PGA-LM in the development of the CD4+CD25+foxp3+ and CD4+IFN-$\gamma$+cells, the phenotype and functions of PGA-LM induced CD4+CD25+foxp3+, and CD4+IFN-$\gamma$+cells in CD4+T cells. These results suggested that PGA-LM could change cytokine production and generate CD4+CD25+foxp3+ Tregs in NC/Nga mice, and may be effective for immunotherapy in patients with AD.

$\gamma$-PGA는 우리 전통 콩 발효식품인 청국장의 끈적끈적한 점액성의 성분으로, 매우 다양한 기능을 가지고 있는 천연 소재이다. 이러한 $\gamma$-PGA가 아토피발진 억제 가능성을 알아보기 위해 NC/Nga 생쥐를 사용하여 in vitro 실험을 실시하였다. $\gamma$-PGA(PGA-HM, 분자량 300 kDa)를 초음파처리로 저분자화시킨 30 kDa 이하의 저분자 PGA-LM를 만들고, 고분자 PGA-HM과 PGA-LM을 사용하여 실험하였는데 동일한 결과를 얻어 PGA-LM 실험결과 중심으로 보고한 것이다. 아토피 피부발진 NC/Nga 생쥐의 비장에서 B 세포와 T세포를 순수 분리하여 항알레르기 작용에 대한 in vitro 실험을 실시하였다. PGA-LM은 hFCs에 대한 세포독성 실험에서 모든 농도에서 세포독성을 나타내지 않았다. PGA-LM이 B 세포 분화 및 활성화에 미치는 영향을 관찰하기 위하여, NC/Nga 생쥐의 비장에서 순수 분리한 B 세포에 anti-CD40/rmIL-4로 자극한 결과, 대조군은 전사인자인 NF-${\kappa}B$의 활성화로 IL-$1\beta$, IL-6, 그리고 TNF-$\alpha$ mRNA의 발현이 증가되었다. 그러나 PGA-LM과 양성대조군인 rmIL-10 투여군은 염증사이토카인 IL-$1\beta$, IL-6 그리고 TNF-$\alpha$ mRNA 유전자 발현이 감소하였고, IL-10 mRNA 유전자 발현은 증가하였으나 TGF-$\beta$ mRNA의 유전자 발현은 대조군과 큰 차이가 나타나질 않았다. 또한 CD4+ T 세포에 PGA-LM $100\;{\mu}g/ml$를 처리한 후 4일간 동시 배양하여 CD4+IFN-$\gamma$+와 CD4+CD25+foxp3+ Treg 세포를 세포내 염색으로 분석한 결과에서는 CD4+IFN-$\gamma$+인 Th1 세포의 증가와 CD4+CD25+foxp3+ Treg 세포를 증가시켜 알레르기반응에서 우위한 Th2 세포에서 Th1 세포로 전환시키는 면역조절 역할을 나타내었다. 이상의 결과로 NC/Nga 생쥐에서 PGA-LM은 염증유전자 발현을 억제시키고 IFN-$\gamma$+의 증가 및 조절 T 세포의 유도로 아토피피부염의 피부발진을 치료하는 면역조절제로 사용될 수 있을 것으로 생각된다.

Keywords

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