KR101685209B1 - 유도된 다능성 줄기 세포의 효율적인 확립 방법 - Google Patents
유도된 다능성 줄기 세포의 효율적인 확립 방법 Download PDFInfo
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Abstract
Description
도 2 는 두가지 유전자 Oct3/4 및 c-Myc 을 MEF 에 도입하여 확립한 iPS 세포 콜로니 (GFP-양성 콜로니) 의 영상을 보여준다 [a) a 위상차 영상; b) GFP-양성 콜로니의 영상].
도 3 은 낮은 산소 농도에서 확립된 iPS 세포 유래의 RNA 를 이용하여 수행한 RT-PCR 의 결과를 나타내는 사진이다. 미분화 상태 Oct3/4(end), Sox2(end), Klf4(end), c-Myc(end), Nanog, Rex1 및 ECAT1 에 대한 마커의 발현 및 도입된 외인성 Oct3/4(Tg) 의 발현을 검사했다. 각각의 레인에 해당하는 시료는 하기와 같다:
521AH5-1 및 535AH5-2: 네가지 유전자 (Oct3/4, Klf4, Sox2, c-Myc) 를 도입; 세포는 5% 산소 농도에서 배양
535AH1-1: 네가지 유전자 도입; 세포는 1% 산소 농도에서 배양
535BH5-1 및 521BH5-3: 세가지 유전자 (Oct3/4, Klf4, Sox2) 를 도입; 세포는 5% 산소 농도에서 배양
527CH5-1, 527CH5-2 및 547CH5-1: 두가지 유전자 (Oct3/4, Klf4) 를 도입; 세포는 5% 산소 농도에서 배양
RF8: 대조군 ES 세포
20D17: 대조군 Nanog-iPS 세포 [Nature , 448, 313-317(2007)]
각 패널의 우측에 있는 숫자는 PCR 사이클의 횟수를 나타낸다.
도 4 에서 상단 패널은 낮은 산소 농도 (5%) 에서 Oct3/4 및 Klf4 를 이용하여 확립한 iPS 세포 (527CH5-2) 를 면역결핍 마우스에 피하주사하여 형성된 기형종의 사진을 나타낸다. 도 4 에서 하단 패널은 수득한 기형종의 조직학적 염색 영상 (헤마톡실린-에오신 염색) 을 나타낸다 [a): 연골 조직, b): 내배엽 상피 조직, c): 근육 조직, d): 각질화 상피 조직].
도 5 는, 두가지, 세가지 또는 네가지 유전자를 도입하여 낮은 산소 농도 (5%) 에서 확립한 iPS 세포를 ICR 마우스 유래의 배반포에 마이크로인젝션하여 만든 성체 키메라의 2 주령때 찍은 사진이다.
a): 네가지 유전자를 도입하여 확립한 iPS 세포 (521AH5-1) 로부터 유도된 키메라성 마우스 (수컷)
b): 세가지 유전자를 도입하여 확립한 iPS 세포 (535BH5-1) 로부터 유도된 키메라성 마우스 (수컷)
c): 세가지 유전자를 도입하여 확립한 iPS 세포 (535BH5-1) 로부터 유도된 키메라성 마우스 (암컷)
d): 두가지 유전자의 도입으로 확립된 iPS 세포로부터 유도된 키메라성 마우스 (수컷) (527CH5-1)
e): 두가지 유전자의 도입으로 확립된 iPS 세포로부터 유도된 키메라성 마우스 (수컷) (527CH5-2)
도 6 는 실시예 7 의 시간 계획표이다.
도 7 은 실시예 7 에서 각종 배양 조건 하에 확립된 iPS 세포의 콜로니 갯수의 그래프 표시이다. "Pre" 는 저산소 조건 하에 예비배양으로 수득된 결과를 나타낸다. "4F", "3F" 및 "Mock" 은 각각 네가지 유전자 (Oct3/4, Klf4, Sox2, c-Myc), 세가지 유전자 (Oct3/4, Klf4, Sox2), 및 공벡터의 도입으로 수득된 결과를 나타낸다.
도 8 은, 실시예 7 에서 감염 제 40 일째에 찍은, 네가지 유전자의 도입으로 수득된 iPS 세포 콜로니 형상의 사진 표시이다. 상단 및 하단 패널은 각각 예비배양없이 저산소 조건 하에 수득한 콜로니 및 예비배양하고 저산소 조건 하에 수득한 것의 영상을 보여준다.
도 9 는, 네가지 유전자 (Oct3/4, Klf4, Sox2, c-Myc) 를 도입하고, 감염 후 제 7 일째부터 1, 2 또는 3 주 동안, 또는 감염 후 40 일이 될 때까지 5% 산소 농도에서 배양하여 수득한 iPS 세포 콜로니의 갯수를 정상 산소 농도 (20%) 에서 수득한 것을 비교한 그래프 표시이다. 3 회의 독립적인 실험의 결과를 함께 나타낸다.
도 10 은, 낮은 산소 농도에서 확립된 iPS 세포 유래의 RNA 를 이용하여 수행한 RT-PCR 결과의 사진 표시이다. 미분화 상태 Oct3/4(end), Sox2(end), Klf4(end), c-Myc(end), Nanog, Rex1, GDF1 및 ESG1 에 대한 마커의 발현을 검사했다. 각각의 레인에 해당하는 시료는 하기와 같다:
96AH5-2 및 96AH5-3: 네가지 유전자 (Oct3/4, Klf4, Sox2, c-Myc) 를 도입; 세포는 감염 후 제 7 일 내지 제 40 일 사이에 5% 산소 농도에서 배양
96AH5W3-4, 96AH5W3-5, 96AH5W3-6: 네가지 유전자 도입; 세포는 감염 후 제 7 일부터 시작하여 3 주 동안 5% 산소 농도에서 배양
96BH5-1: 세가지 유전자 (Oct3/4, Klf4, Sox2) 도입; 세포는 5% 산소 농도에서 예비배양
201B2: 대조군 iPS 세포 (Cell , 131, 861-872(2007))
각 패널의 우측의 숫자는 PCR 싸이클의 횟수를 나타낸다.
도 11 은, 인간 ES-형 콜로니의 대표적인 위상차 영상 (a) 및 5% 산소 농도 하에 생성된 확립 iPS 클론의 알칼리성 포스파타아제 염색 (b) 을 나타낸다. 5% 산소 하에 생성된 미분화 인간 iPS 세포의 면역세포학적 염색. Nanog (c), SSEA3 (d), SSEA4 (e).
도 12 는, 인간 α-페토프로틴, 평활근 액틴, bIII-튜뷸린, GFAP, Desmin 및 Vimentin 에 대한 항체로 염색하여 수득한, 인간의 네가지 유전자 (Oct3/4, Klf4, Sox2, c-Myc) 를 도입하고, 출발 세포를 5% 산소 농도 (70AH5-2, 70AH5-6) 에서 배양하여 확립한 iPS 세포가 삼배엽 분화에 대한 잠재성을 보유한다는 것을 확인시켜주는 결과의 사진 표시이다 [좌측: 위상차 영상; 우측: 면역형광 영상].
도 13 은, SCID 마우스의 고환에 인간의 네가지 유전자 (Oct3/4, Klf4, Sox2, c-Myc) 를 도입하고 출발 세포를 5% 산소 농도 (70AH5-2) 에서 배양하여 확립한 인간 iPS 세포를 주사하여 수득한 기형종의 조직학적 염색 영상 (헤마톡실린-에오신 염색) 을 보여준다 [a) 신경 상피 조직, b) 망막 상피 조직, c) 뼈 조직, d) 평활근 조직, e) 내배엽 상피 조직].
도 14 (a) 내지 (d) 는, 네가지 인자를 형질도입한 MEF 로부터의 Nanog-GFP-양성 콜로니를 제 21 일째 (a) 및 제 28 일째 (b) 에 계수한 것을, 세가지 인자를 형질도입한 MEF 로부터의 것을 제 21 일째 (c) 및 제 28 일째 (d) 계수한 것과 비교하는 그래프 제시이다. 도 14 (e) 및 (f) 는 네가지 인자를 형질도입한 MEF (e) 및 세가지 인자를 형질도입한 MEF (f) 로부터의 전체 콜로니 중 GFP-양성 콜로니의 백분율을 제 21 일째에 비교한 그래프 표시이다.
도 15 (a) 는, 발프로산 (VPA) 의 존재 또는 부재 하에 저산소 및 정상 조건 하에 배양한 제 9 일째에 네가지 인자를 형질도입한 MEF 로부터 GFP-양성 세포의 백분율을 비교하는 그래프 표시를 나타낸다. 도 15 (b) 내지 (e) 는 VPA 부재 하의 20% 산소 (b) 및 5% 산소 (c) 하에서, 및 VPA 존재 하의 20% 산소 (d) 및 5% 산소 (e) 하에서 네가지 인자를 형질도입한 MEF 의 대표적인 유세포분석을 보여준다.
도 16 은, 형질도입 후 제 21 일째의 20% 산소 ((a); 상전이, (b); GFP) 및 5% 산소 ((c); 상전이, (d); GFP) 하의 GFP-양성 콜로니의 대표적인 영상이다. 스케일 바아는 200 ㎛ 를 나타낸다.
도 17 은, 20% 산소 (a) 및 5% 산소 (b) 하에 네가지 인자를 감염시킨 MEF 의 제 21 일째 대표적인 영상, 20% 산소 (c), 및 5% 산소 (d) 하에 세가지 인자를 감염시킨 MEF 의 제 28 일째 대표적인 영상을 보여준다.
도 18 은 527CH5-1 의 핵형 분석을 보여준다.
도 19 는, 아폽토시스성 세포 ES 세포 (RF8) (a) 및 네가지 인자를 형질도입한 MEF (b) 의 백분율을 비교하는 그래프 표시를 보여준다. ES 세포는 웰 당 1x105 개의 세포 밀도로 STO 세포의 피더층에 시딩하고, 정상산소 또는 저산소 하에 제 1 일부터 제 3 일까지 배양했다. 제 3 일째에, 세포를 아넥신 V-FITC 로 처리하고, 유세포분석에 적용했다. 막대그래프는 아폽토시스성 세포의 백분율을 나타낸다 (아넥신 V-FITC-양성). 네가지 인자를 형질도입한 MEF 는 형질도입 후 제 4 일째에 STO 세포 상에 시딩하고, 저산소 및 정상산소 조건 하에 제 5 일부터 제 9 일까지 배양하고, 세포를 아넥신-V 친화성 검정에 적용했다. 막대그래프는 아폽토시스성 세포의 백분율을 나타낸다. 3 회 실험의 평균 및 표준 편차를 제시한다.
도 20 은, ES 세포 (RF8) (a) 및 네가지 인자 및 mock 로 형질도입한 MEF (b) 의 세포 갯수를 비교하는 그래프 표시를 보여준다. ES 세포는 웰 당 1x105 개의 세포 밀도로 STO 세포의 피더층 상에 시딩하고, 정상산소 또는 저산소 하에 제 1 일부터 제 3 일까지 배양했다. 제 3 일째에, 세포의 갯수를 계수했다. 막대그래프는 ES 세포의 세포 계수를 나타낸다. 3 회 실험의 평균 및 표준편자를 제시한다. 네가지 인자 및 mock 을 형질도입한 MEF 를 각각 저산소 또는 정상산소 조건 하에 제 1 일부터 제 4 일까지 배양하고, 세포의 갯수를 계수했다. 막대그래프는 세포 계수를 나타낸다. 4 회 실험의 평균 및 표준 편차를 제시한다. * p>0.05
도 21 은, 5% 산소 하에 네가지 인자를 형질도입한 MEF 를 20% 산소 하의 것과 비교하는, ES 세포 특이적 유전자 (a) 및 MEF-특이적 유전자 (b) 의 발현 패턴의 산점도를 보여준다. ES 세포 및 MEF 에서 특이적으로 발현되는 유전자를 선별했다 (10 배 이상 차이). 저산소 처리한 네가지 인자로 형질도입한 MEF 에서 상향 및 하향조절된 유전자는 각각 적색 및 청색으로 나타낸다. 녹색선은 유전자 발현 수준에서 다섯배 변화를 나타낸다.
도 22 는, 정량적 실시간 RT-PCR 에 의한 내재성 Oct3/4 및 Nanog 의 상대적 발현을 보여준다.
도 23 (a) 는, 제 21 일째의 Nanog-GFP-양성 콜로니의 계수를 비교하는 그래프 제시를 보여준다. 3 회 실험의 평균 및 표준 편차를 제시한다. 스케일 바아, 200 ㎛. * 는 p>0.05 을 의미한다. 도 23 (b) 내지 (e) 는 20% 산소 ((b); 상전이, (c); GFP) 및 5% 산소 ((d); 상전이, (e); GFP) 하에 유도된 GFP-양성 콜로니의 대표적인 영상을 보여준다.
도 24 (a) 는 제 12 일 째에 piggyBac 위치이동에 의한 핵 초기화 MEF 유래의 Nanog-GFP-양성 콜로니를 각각 계수한 것을 비교하는 그래프 제시를 보여준다. 3 회 실험의 평균 및 표준 편차를 제시한다. * 및 ** 는 각각 p<0.01 및 p<0.001 을 의미한다. 도 24 (b) 내지 (e) 는 20% 산소 ((b); 상전이, (c); GFP) 및 5% 산소 ((d); 상전이, (e); GFP) 하에 유도된 GFP-양성 콜로니의 대표적인 영상을 보여준다.
Claims (11)
- 체세포를 그의 핵 초기화 단계에서 상압에서의 산소 농도가 1% 내지 5% 인 저산소 조건 하에 배양하는 것을 포함하는, 유도된 다능성 줄기 세포의 확립 효율을 개선하는 방법.
- 삭제
- 제 1 항에 있어서, 상압에서의 산소 농도가 5% 인 방법.
- 제 1 항 또는 제 3 항에 있어서, 핵 초기화 단계는 핵 초기화 물질과 체세포의 접촉에 의해 수행되고, 핵 초기화 물질은 하기의 물질 또는 그것을 코딩하는 핵산을 포함하는 방법:
(i) Oct3/4 및 Sox2, 또는
(ii) Oct3/4 및 Klf4, 또는
(iii) Oct3/4 및 c-Myc, 또는
(iv) Oct3/4, Klf4 및 Sox2, 또는
(v) Oct3/4, Klf4 및 c-Myc, 또는
(vi) Oct3/4, Klf4, Sox2 및 c-Myc. - 제 1 항 또는 제 3 항에 있어서, 핵 초기화의 단계에서 효율 개선제로서의 발프로산을 사용하는 추가적인 단계를 포함하는 방법.
- 제 1 항 또는 제 3 항에 있어서, 핵 초기화 물질과의 접촉 후 저산소 조건 하의 체세포 배양을 3 일 초과 동안 수행하는 방법.
- 하기를 포함하는, 유도된 다능성 줄기 세포의 제조 방법:
a) 체세포의 핵 초기화 물질과의 접촉 단계로서, 이때 핵 초기화 물질은 하기의 물질, 또는 그것을 코딩하는 핵산을 포함하는 단계;
(i) Oct3/4 및 Sox2, 또는
(ii) Oct3/4 및 Klf4, 또는
(iii) Oct3/4 및 c-Myc, 또는
(iv) Oct3/4, Klf4 및 Sox2, 또는
(v) Oct3/4, Klf4 및 c-Myc, 또는
(vi) Oct3/4, Klf4, Sox2 및 c-Myc, 및
b) 상압에서의 산소 농도가 1% 내지 5% 인 저산소 조건 하 체세포의 배양 단계. - 삭제
- 제 7 항에 있어서, 상압에서의 산소 농도가 5% 인 방법.
- 제 7 항 또는 제 9 항에 있어서, 상기 체세포를 발프로산과 접촉시키는 추가의 단계를 포함하는 방법.
- 제 7 항 또는 제 9 항에 있어서, 핵 초기화 물질과의 접촉 후 저산소 조건 하의 체세포 배양을 3 일 초과 동안 수행하는 방법.
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