KR20150069374A - 줄기세포의 노화 억제용 조성물 - Google Patents
줄기세포의 노화 억제용 조성물 Download PDFInfo
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- KR20150069374A KR20150069374A KR1020130155689A KR20130155689A KR20150069374A KR 20150069374 A KR20150069374 A KR 20150069374A KR 1020130155689 A KR1020130155689 A KR 1020130155689A KR 20130155689 A KR20130155689 A KR 20130155689A KR 20150069374 A KR20150069374 A KR 20150069374A
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- 230000001131 transforming effect Effects 0.000 description 1
- 230000017105 transposition Effects 0.000 description 1
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Abstract
본 발명은 줄기세포의 노화 및 다분화능 상실의 원인 인자로서 IL-6 및이에 의해 발현이 유도되는 Runx2/Dlx5를 새롭게 발굴하였으며, 이들의 발현 억제를 통해 장기간의 배양기간에도 줄기세포의 노화가 억제되고 다분화능이 유지될 수 있음을 제안한다.
본 발명은 줄기세포의 치료적 유효량을 수득하기 위해 인 비트로에서 여러 계대를 거치면서 장기 배양을 할 때 나타나는 노화 및 골 계열로의 분화 치중의 문제를 근본적으로 해결함으로써 희소가치가 높은 치료자원으로서의 줄기세포를 보다 효율적으로 이용할 수 있도록 한다.
Description
도 2는 LCP(Large cell population)가 SCP(small cell population)의 세포노화 및 골계열로의 분화에 미치는 영향을 나타낸 그림이다. 도 2a는 비균질 세포 파퓰레이션을 FACS 기기를 이용하여 세포 크게에 따라 LCP 및 SCP로 분리한 결과를 나타낸 그림이다. 도 2b 및 도 2c는 LCP 및 SCP 각각의 콜로니 형성능력을 비교한 결과로서, 본 발명자들의 예상대로 SCP에 비하여 LCP는 콜로니 형성능력이 거의 없음을 Crystal violet 염색(도 2b, 현미경 배율 x100) 및 Senescence-associated β-galactosidase 어세이(도 2c)를 통해 각각 확인되었다. 도 2d 및 도 2e는 Cell Culture Insert를 이용하여 세포 배양 접시 바닥에는 SCP를, 배양 접시위에 삽입된 Insert에는 LCP를 배양한 결과 다분화능을 가진 SCP가 LCP에 의하여 노화가 진행됨을 확인한 결과로서, Senescence-associated β-galactosidase 염색 결과(도 2d) 및 상기 결과를 정량화한 그래프(도 2e)를 보여주는 그림이다. 도 2f는 LCP에 의하여 SCP에서의 Runx2와 Dlx5의 발현이 증가되고 Sox2의 발현은 현저히 감소됨을 나타낸 그림이다.
도 3은 Human Cytokine Array를 이용하여 LCP에서 분비되는 사이토카인을 동정한 결과, LCP에서 IL-6의 발현 및 분비가 SCP에 비해 높음을 다각도로 확인한 결과를 보여주는 그림이다. 도 3a는 인간에서 분비되는 36가지의 특정 시이토카인의 항체가 코팅되어 있는 막에 48시간동안 각 조건의 세포가 배양되었던 배양액을 처리하여 각 세포들이 배양액으로 분비한 사이토카인의 종류를 확인한 결과를 보여주는 그림이다. 도 3b는 도 3a의 결과들을 정량화한 그래프를 나타낸다. 도 3c는 도 3a 및 도 3b에서 확인된 IL-6가 정말 LCP에서 많이 분비되는지 확인하고자 각 세포를 키웠던 배양액을 모은 후 IL-6 특이적 항체를 이용하여 ELISA assay를 수행하한 결과를 나타낸 그림이다.
도 4는 IL-6가 SCP의 세포노화 및 자가 재생능력에 미치는 영향을 나타낸 그림이다. 도 4a는 IL-6를 중간엽 줄기세포에 처리하자 STAT3 인산화가 진행됨을 확인한 결과를 나타낸 그림이다. 도 4b 및 도 4c는 IL-6가 SCP의 노화를 가속시키고 콜로니 형성능력을 감소시킴을 각각 Senescence-associated β-galactosidase 어세이(도 4b) 및 OD값 측정을 통해 확인한 결과를 나타낸 그림이다. 도 4d는 IL-6가 Runx2와 Dlx5의 단백질 발현을 농도 의존적으로 증가시키고, Sox2의 단백질 발현은 감소시킴을 확인한 결과를 나타낸 그림이다.
도 5는 IL-6가 SCP의 다분화능에 미치는 영향을 나타낸 그림으로, IL-6가 ALP, Runx2 및 오스테오칼신(ostepcalcin)의 발현을 증가시켜 골분화를 유도함을 보여준다.
도 6은 IL-6 수용체에 대한 항체인 토실리주맙(tocilizumab)이 골수유래 중간엽 줄기세포의 골계열로의 분화에 미치는 영향을 나타낸 그림이다. 도 6a는 Cell Culture Insert System을 이용한 실험에서 토실리주맙 처리에 의해 SCP에서의 STAT3 인산화가 감소함을 나타낸 그림이다. 도 6b는 증가하였던 Runx2와 Dlx5의 발현이 다시 감소함을 보여주고, 도 6c는 감소되었던 Sox2의 발현이 회복됨을 보여줌으로써, LCP에 의하여 골분화 단계로 어느정도 계열이 제한되었던 SCP가 토실리주맙 투여로 인하여 전분화능을 다시 회복함을 확인하였다.
도 7은 IL-6에 의해 유도된 Runx2 및 Dlx5가 Sox 2의 발현을 조절함을 보여주는 그림이다. Runx와 Dlx5의 발현을 억제하였을 시 Sox2의 발현을 증가하지만(도 7a) Sox2를 억제하였을때는 Runx2와 Dlx5의 발현은 큰 변화가 없음을 관찰함으로써(도 7b) Sox2가 Runx2와 Dlx5에 의하여 발현이 조절됨을 확인하였다. 도 7c는 Runx2와 Dlx5를 표적으로 하는 siRNA를 이용하여 Runx2/Dlx5의 유전자 발현을 억제하자 Sox2의 발현이 다시 증가함을 나타낸 그림이다. 도 7d는 세포내에서 Sox2가 결합할 수 있는 특정 염기서열을 가진 벡터를 세포 내로 형질전환시킨 후 IL-6, Runx2 및 Dlx5의 발현을 조절하여 Sox2의 전사활성을 측정한 결과를 나타낸 그림이다. 도 7e는 IL-6 부재 하에서 Runx2와 Dlx5의 과발현을 통해 Sox2의 전사활성이 감소됨을 보여주는 그림이다.
Claims (12)
- 인터루킨-6(IL-6) 또는 IL-6 수용체 억제제를 유효성분으로 포함하는 줄기세포의 분화 또는 노화 억제용 조성물.
- 제 1 항에 있어서, 상기 인터루킨-6(IL-6) 또는 IL-6 수용체 억제제는 IL-6 또는 IL-6 수용체에 특이적으로 결합하는 항체인 것을 특징으로 하는 조성물.
- 제 1 항에 있어서, 상기 인터루킨-6(IL-6) 또는 IL-6 수용체 억제제는 IL-6 유전자 또는 IL6R(Interleukin 6 receptor) 유전자의 발현을 억제하는 핵산분자인 것을 특징으로 하는 조성물.
- 제 3 항에 있어서, 상기 핵산 분자는 T-DNA, siRNA, shRNA, miRNA, 리보자임(ribozyme), PNA(peptide nucleic acids) 또는 안티센스 올리고뉴클레오타이드인 것을 특징으로 하는 조성물.
- 제 1 항에 있어서, 상기 줄기세포는 중간엽 줄기세포인 것을 특징으로 하는 조성물.
- Runx2 또는 Dlx5의 억제제를 유효성분으로 포함하는 줄기세포의 분화 또는 노화 억제용 조성물.
- 제 6 항에 있어서, 상기 Runx2 또는 Dlx5의 억제제는 Runx2 또는 Dlx5 단백질에 특이적으로 결합하는 항체인 것을 특징으로 하는 조성물.
- 제 6 항에 있어서, 상기 Runx2 또는 Dlx5의 억제제는 Runx2 유전자 또는 Dlx5 유전자의 발현을 억제하는 핵산분자인 것을 특징으로 하는 조성물.
- 제 8 항에 있어서, 상기 핵산 분자는 T-DNA, siRNA, shRNA, miRNA, 리보자임(ribozyme), PNA(peptide nucleic acids) 또는 안티센스 올리고뉴클레오타이드인 것을 특징으로 하는 조성물.
- 제 6 항에 있어서, 상기 줄기세포는 중간엽 줄기세포인 것을 특징으로 하는 조성물.
- (a) 시험물질을 미분화 줄기세포에 접촉시키는 단계; 및 (b) 상기 줄기세포 내 IL-6 또는 IL-6 수용체의 발현량을 측정하는 단계를 포함하는 줄기세포 분화 또는 노화 억제용 조성물의 스크리닝 방법, 상기 IL-6 또는 IL-6 수용체의 발현량이 감소되는 경우에는 상기 시험물질은 줄기세포 분화 또는 노화 억제용 조성물로 판정된다.
- (a) 시험물질을 미분화 줄기세포에 접촉시키는 단계; 및 (b) 상기 줄기세포 내 Runx2 또는 Dlx5의 발현량을 측정하는 단계를 포함하는 줄기세포 분화 또는 노화 억제용 조성물의 스크리닝 방법, 상기 Runx2 또는 Dlx5의 발현량이 감소되는 경우에는 상기 시험물질은 줄기세포 분화 또는 노화 억제용 조성물로 판정된다.
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