KR102498546B1 - 항체를 분비하는 대식세포의 제조방법 및 이를 이용한 항암치료 기술 - Google Patents
항체를 분비하는 대식세포의 제조방법 및 이를 이용한 항암치료 기술 Download PDFInfo
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Abstract
본 발명을 통해 제조된 항체를 분비하는 대식세포는 암세포 특이적 항원을 인지할 수 있는 항체를 분비하여 암세포를 효과적으로 제거할 수 있다. 특히 본 발명을 통해 제조된 대식세포는 고형암 부위로 이동하여 항암 항체를 분비함으로서 암세포를 옵소닌화하여 대식작용을 통해 제거하고, 이렇게 소화된 항원들은 후천 면역을 활성화시키는 연쇄 반응을 통해 추가적인 항암 효과를 유도할 수 있어서 매우 효과적인 암 치료제 개발에 유용하게 활용될 수 있다. 또한, 본 발명이 제공하는 동물세포용 플라스미드는 매우 높은 효율로 동물세포를 형질전환할 수 있어 산업상 이용가능성이 매우 높다.
Description
도 2는 pCGfd-GFP 플라스미드를 이용한 대식세포로의 형질전환 효율을 측정하는 실험이다. (A) 대조군 플라스미드들과 pCGfd-GFP 플라스미드를 Raw264.7 대식세포에 microporation한지 24시간 후 형광현미경을 통해 관찰하였다. Scale bars = 20 ㎛ (B) 각각의 플라스미드들을 microporation 한 후 flow cytometry를 통해 GFP 단백질 발현을 확인하였다. (C) 각각의 플라스미드들을 microporation 한 후 1일차, 2일차, 4일차, 6일차에 flow cytometry를 통해 GFP 단백질의 발현 지속 기간을 비교하였다. (D) 각각의 플라스미드들을 microporation한지 24시간 후 세포의 생존율을 trypan blue 염색법을 통해 분석하였다. 그래프의 결과는 3반복 실험의 평균값으로 standard deviation (SD) 값을 이용하여 오차막대를 나타내었다. *p<0.05, **p<0.01, ***p<0.001
도 3은 pCGfd-Anti-EGFR-scFv-Fc 플라스미드를 구성하는 방법 및 구조를 나타내는 모식도이다.
도 4는 Raw 264.7 대식세포에서의 anti-EGFR-scFv-Fc 분비 발현을 분석한 결과이다. (A) 플라스미드에서 발현되는 Anti-EGFR-scFv-Fc의 구조를 나타낸 그림이다. (B) Non-reducing 조건과 reducing 조건에서의 웨스턴블랏(Western blot)을 통해 Raw 264.7 대식세포에서의 항체 분비 발현을 확인하였다.
도 5는 flow cytometry를 이용한 A431, HT-29, A673 세포의 EGFR 발현량을 분석한 결과이다. (A-C) A431 세포(A), HT-29 세포(B), A673 세포(C)들을 anti-EGFR 항체, 형광을 띄는 2차 항체를 순차적으로 이용하여 염색한 후 flow cytometry 방법을 통해 세포별 EGFR 발현량을 분석한 결과이다. (D) 각 세포의 평균형광강도를 그래프화 한 분석값이다. 그래프의 결과는 3반복 실험의 평균값으로 SD 값을 이용하여 오차막대를 나타내었다. ns = non-significance, *p<0.05, ***p<0.001
도 6은 anti-EGFR-scFv-Fc를 발현하는 Raw 264.7 대식세포에서의 암세포 대식작용이 증가하는 것을 공초점 형광현미경(confocal microscope)을 통해 관찰한 결과이다. (A, B) A431 세포(A), HT-29 세포(B)를 녹색 형광, 대조군 대식세포주, 항체를 분비하는 대식세포주를 빨간색 형광으로 각각 염색한 후 서로 섞어2 시간 반응시킨다. 반응시킨 세포들을 공초점 형광현미경으로 관찰한 결과이다. Scale bars = 20 ㎛
도 7은 anti-EGFR-scFv-Fc를 발현하는 Raw 264.7 대식세포가 암세포들인 A431, HT-29, A673 세포에 대한 대식작용 증가를 flow cytometry를 통해 분석한 결과이다. (A-C) 도 6에서 설명한 방법을 통해 각각의 세포를 염색한 후, Raw 264.7과 A431(A), HT-29(B), A673(C) 간의 비율을 1 : 0.1, 1 : 0.2, 1 : 1, 1 : 2로 섞어 준 후 flow cytometry를 통해 대식작용을 분석한 결과이다. 각 비율은 전체 Raw 264.7 대식세포 중 대식작용을 일으킨 세포의 비율로 계산하였다. 그래프의 결과는 3반복 실험의 평균값으로 SD 값을 이용하여 오차막대를 나타내었다. ns = non-significance, *p<0.05, **p<0.01, ***p<0.001
도 8은 마우스 이종이식 모델을 이용한 항체를 분비하는 대식세포의 항암 작용을 분석한 결과이다. (A) 실험의 모식도를 나타내었다. (B) 종양의 형성을 확인한 뒤 2일 간격으로 측정한 종양의 부피를 분석한 결과이다. (C-E) 마우스의 오른쪽 옆구리에 형성된 종양의 크기(C), 분리해낸 종양(D), 저울로 측정한 종양의 무게(E)를 분석한 결과이다. 그래프의 결과는 마우스 5마리의 평균 값으로 standard error of the means (SEM) 값을 이용하여 오차막대를 나타내었다. ns = non-significance, *p<0.05, **p<0.01
도 9은 MCS를 포함하는 pCGfd 플라스미드의 구조를 나타낸다.
Claims (18)
- 복제 기점(ori), 선별 마커(selection marker), 박테리아 프로모터, 인핸서와 연결된 포유동물에서 작동하는(operable) 프로모터, 인트론, 항체를 코딩하는 유전자 및 폴리아데닐화 서열로 이루어지며 CpG 모티프(motif)가 제거된 pCpG free 플라스미드에서 S/MAR (scaffold/matrix attachment region) 및 βGloMAR (β-globin matrix attachment region)가 결핍된, pCpG free 플라스미드보다 작은 크기의 플라스미드로 형질전환된, 항체를 생산하는 대식세포.
- 제1항에 있어서, 상기 복제 기점은 R2K, R6K, R1, pSC101, Rts1, F, RSF1010, P1, P4, 람다, Phi82 또는 Phi80에서 유래되는 것을 특징으로 하는 대식세포.
- 제1항에 있어서, 상기 선별 마커는 항생제 내성 유전자, 형광 단백질을 코딩하는 유전자 또는 필수 영양소 생산 유전자인 것을 특징으로 하는 대식세포.
- 제3항에 있어서, 상기 항생제 내성 유전자는 암피실린(ampicilin) 저항 유전자, 테트라사이클린(tetracyclin) 저항 유전자, 카나마이신(kanamycin) 저항 유전자, 클로람페니콜(chloroamphenicol) 저항 유전자, 스트렙토마이신(streptomycin) 저항 유전자, 네오마이신(neomycin) 저항 유전자, 제오신 (Zeocin) 저항 유전자 및 퓨로마이신(Puromycin) 저항 유전자로 이루어진 군에서 선택되는 것을 특징으로 하는 대식세포.
- 제1항에 있어서, 상기 박테리아 프로모터는 actA, hly, p60, phoA, tac, lpp, lac-lpp, lac, ara, trp, trc, T7 및 EM2K로 이루어진 군에서 선택된 것을 특징으로 하는 대식세포.
- 제1항에 있어서, 상기 포유동물에서 작동하는 프로모터는 CMV(Cytomegalovirus) 프로모터, 아데노바이러스 후기 프로모터, 백시니아 바이러스 7.5K 프로모터, SV40(Simian Virus 40) 프로모터, SV40E1 프로모터, HSV(Herpes simplex virus)의 tk 프로모터, RSV(Respiratory syncytial virus) 프로모터, 인간 EF1(human elongation factor-1 alpha) 알파 프로모터, 메탈로티오닌 프로모터, 베타-액틴 프로모터, 인간 IL-2(interluekin-2) 유전자의 프로모터, 인간 IFN(interferon) 유전자의 프로모터, 인간 IL-4(interluekin-4) 유전자의 프로모터, 인간 림포톡신 유전자의 프로모터 및 인간 GM-CSF(Granulocyte macrophage colonystimulating factor) 유전자의 프로모터로 이루어진 군에서 선택되는 것을 특징으로 하는 대식세포.
- 제1항에 있어서, 상기 항체는 종양 항원에 특이적인 항체인 것을 특징으로 하는 대식세포.
- 제7항에 있어서, 상기 종양 항원은 EGFR, HER2/neu, HER3, HER4, Ep-CAM, CEA, TRAIL, TRAIL-수용체 1, TRAIL-수용체 2, 림포톡신-베타 수용체, MUC1, WT1, CCR4, CD19, CD20, CD22, CD28, CD33, CD40, CD80, CSF-1R, CTLA-4, 섬유모세포 활성 단백질 (FAP), 헵신, 흑색종-관련 콘드로이틴 설페이트 프로테오글리칸 (MCSP), 프로스테이트-특이적 막 항원 (PSMA), VEGF 수용체 1, VEGF 수용체 2, IGF1-R, TSLP-R, TIE-1, TIE-2, TNF-알파, 세포자멸사의 TNF성 약한 유도제 (TWEAK) 및 IL-1R로 이루어진 군에서 선택되는 것을 특징으로 하는 대식세포.
- 제1항에 있어서, 상기 항체를 코딩하는 유전자는 항체 경쇄-링커-항체 중쇄-Fc 영역을 코딩하는 서열로 이루어진 것을 특징으로 하는 대식세포.
- 제1항에 있어서, 상기 폴리아데닐화 서열은 소성장 호르몬(Bovine Growth Hormone), HSV(Herpes simplex virus) 유래 TK(Thymidine Kinase), 래빗 β-글로빈 폴리아데닐화 서열 및 SV40(Simian virus 40) 유래 폴리 아데닐화 서열로 이루어진 군에서 선택되는 것을 특징으로 하는 대식세포.
- 제1항에 있어서, 상기 플라스미드는 도 3의 개열지도를 갖는 것을 특징으로 하는 대식세포.
- 제7항 또는 제8항의 대식세포를 유효성분으로 포함하는 암 예방 또는 치료용 약학적 조성물.
- 제12항에 있어서, 상기 암은 고형암(solid tumor)인 것을 특징으로 하는 약학적 조성물.
- 제13항에 있어서, 상기 고형암은 위암, 간암, 교세포종, 난소암, 대장암, 두경부암, 방광암, 신장세포암, 유방암, 전이암, 전립선암, 췌장암, 흑색종, 폐암 및 이들의 상피세포암(epidermoid carcinoma)로 이루어진 군에서 선택되는 것을 특징으로 하는 약학적 조성물.
- 삭제
- 삭제
- 하기 단계를 포함하는, 종양 항원에 대한 항체를 생산하는 대식세포의 제조방법:
(a) 복제 기점(ori), 선별 마커(selection marker), 박테리아 프로모터, 인핸서와 연결된 포유동물에서 작동하는(operable) 프로모터, 인트론, 목적 단백질을 코딩하는 핵산 클로닝 영역(MCS) 및 폴리아데닐화 서열로 이루어지며 CpG 모티프(CpG motif)가 제거된 pCpG free 플라스미드에서 S/MAR (scaffold/matrix attachment region) 및 βGloMAR (β-globin matrix attachment region)가 결핍된, pCpG free 플라스미드보다 작은 크기의 플라스미드의 핵산 클로닝 영역(MCS)에 종양 항원에 대한 항체를 코딩하는 유전자를 삽입하는 단계; 및
(b) 상기 플라스미드를 대식세포에 형질전환시키는 단계.
- 제17항에 있어서, 상기 (a) 단계 이후에 상기 플라스미드를 대장균에 형질전환하고 배양하여 플라스미드를 증폭하는 단계를 추가로 포함하는 것을 특징으로 하는 제조방법.
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