Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Sphingosine-1-Phosphate-Induced Migration and Differentiation of Human Mesenchymal Stem Cells to Smooth Muscle Cells

Sphingosine-1-phosphate에 의한 중간엽 줄기세포의 이동과 평활근세포로의 분화

  • Song, Hae-Young (Department of Physiology, School of Medicine, Medical Research Institute, Pusan National University) ;
  • Shin, Sang-Hun (Department of Physiology, School of Medicine, Medical Research Institute, Pusan National University) ;
  • Kim, Min-Young (Department of Physiology, School of Medicine, Medical Research Institute, Pusan National University) ;
  • Kim, Jae-Ho (Department of Physiology, School of Medicine, Medical Research Institute, Pusan National University)
  • 송해영 (부산대학교 의학전문대학원 생리학교실) ;
  • 신상훈 (부산대학교 의학전문대학원 생리학교실) ;
  • 김민영 (부산대학교 의학전문대학원 생리학교실) ;
  • 김재호 (부산대학교 의학전문대학원 생리학교실)
  • Received : 2010.11.08
  • Accepted : 2011.01.21
  • Published : 2011.02.28
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Abstract

Migration and differentiation of mesenchymal stem cells are crucial for tissue regeneration in response to injury. Sphingosine-1-phosphate (S1P) is a bioactive lipid that regulates a variety of biological processes, including proliferation, survival, differentiation and motility. In the present study, we determined the role of S1P in migration and differentiation of human bone marrow-derived mesenchymal stem cells (BMSCs). S1P stimulated migration of BMSCs in a dose- and time-dependent manner, and pre-incubation of the cells with pertussis toxin completely abrogated S1P-induced migration, suggesting involvement of Gi-coupled receptors in S1P-induced cell migration. S1P elicited elevation of intracellular concentration of $Ca^{2+}$ ($[Ca^{2+}]_i$) and pretreatment with VPC23019, an antagonist of $S1P_1/S1P_3$, blocked S1P-induced migration and increase of $[Ca^{2+}]_i$. Small interfering RNA-mediated knockdown of endogenous $S1P_1$ attenuated S1P-induced migration of BMSCs. Furthermore, S1P treatment induced expression of $\alpha$-smooth muscle actin ($\alpha$-SMA), a smooth muscle marker, and pretreatment with VPC23019 abrogated S1P-induced $\alpha$-SMA expression. S1P induced phosphorylation of p38 mitogen-activated protein kinase (MAPK), and pretreatment of cells with SB202190, an inhibitor of p38 MAPK, or adenoviral overexpression of a dominant-negative mutant of the p38 MAPK blocked S1P-induced cell migration and $\alpha$-SMA expression. Taken together, these results suggest that S1P stimulates migration and smooth muscle differentiation of BMSCs through an $S1P_1$-p38 MAPK-dependent mechanism.

중간엽 줄기세포의 이동과 분화는 손상된 조직의 재생을 위해 필수적이다. Sphingosine-1-phosphate (S1P)는 세포성장, 생존, 분화, 이동성 등 여러 가지 생명현상에 중요한 역할을 하는 생리활성 지질이다. 본 연구에서는 인체 골수유래 중간엽 줄기세포의 이동과 세포분화에 대한 S1P의 영향을 조사하였다. S1P는 중간엽 줄기세포의 이동을 증가시켰으며 pertussis toxin의 전처리는 S1P에 의한 세포이동을 억제하였다. 본 결과는 S1P에 의한 세포 이동과정에 Gi에 연결된 수용체가 관여함을 제시한다. $S1P_1$과 $S1P_3$ 수용체에 대한 길항제인 VPC23019의 전처리나 siRNA를 이용한 $S1P_1$ 수용체의 발현억제는 S1P에 의한 세포 내 칼슘 증가와 중간엽 줄기세포의 이동을 저해 하였다. 또한, S1P의 처리는 중간엽 줄기세포에서 평활근세포의 표지유전자인 $\alpha$-smooth muscle actin ($\alpha$-SMA)의 발현을 증가시켰으며 VPC23019의 전처리는 S1P에 의한 $\alpha$-SMA의 발현증가를 저해하였다. S1P는 중간엽 줄기세포에서 p38 mitogen-activated protein kinase (p38 MAPK)의 인산화를 촉진하였으며 p38 MAPK의 저해제인 SB202190의 전처리 또는 p38 MAPK의 dominant negative mutant의 과발현은 S1P에 의한 중간엽 줄기세포의 이동 $\alpha$-SMA 발현증가를 억제하였다. 본 연구결과는 S1P가 $S1P_1$-p38 MAPK 신호전달기전을 통해 중간엽 줄기세포의 이동과 평활근세포로의 분화를 촉진함으로써 중간엽 줄기세포를 이용한 조직재생에의 활용 가능성을 제시한다.

Keywords

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