Modulation of Fas-Fas Ligand Interaction Rehabilitates Hypoxia-Induced Apoptosis of Mesenchymal Stem Cells in Ischemic Myocardium Niche.
Mesenchymal stem cells (MSCs) have the potential to repair and regenerate ischemic heart tissue; however, the poor viability of transplanted MSCs in the ischemic region is a major obstacle to their therapeutic use. This cell death is caused by Fas and Fas ligand (FasL) interactions under harsh conditions. To investigate improving the survival and therapeutic effects of MSCs, we focused our research on Fas-FasL-mediated cell death. In this study, we found that the poor viability of transplanted MSCs was caused by Fas-FasL interactions between host ischemic myocardial cells and implanted MSCs. In addition, we found that increased Fas expression and the corresponding decrease of cell survival were in close relation to hypoxic MSCs treated with FasL and H2O2. When MSCs were treated with a recombinant Fas/Fc chimera (Fas/Fc) inhibiting Fas-FasL interactions, the expressions of proapoptotic proteins including caspase-8, caspase-3, Bax, and cytochrome-c were attenuated, and the survival of MSCs was recovered. In ischemia-reperfusion injury models, the interaction between FasL in ischemic heart and Fas in implanted MSCs caused a loss of transplanted MSCs, whereas the inhibition of this interaction by Fas/Fc treatment improved cell survival and restored heart function. Thus, our study suggests that Fas-FasL interactions are responsible for activating cell death signaling in implanted stem cells and could be a potential target for improving therapeutic efficacy of stem cells in treating ischemic heart diseases.
Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, Republic of Korea.
Onju
O
Ham
Se-Yeon
SY
Lee
Byeong-Wook
BW
Song
Min-Ji
MJ
Cha
Chang Youn
CY
Lee
Jun-Hee
JH
Park
Il-Kwon
IK
Kim
Jiyun
J
Lee
Hyang-Hee
HH
Seo
Min-Ji
MJ
Seung
Eunhyun
E
Choi
Yangsoo
Y
Jang
Ki-Chul
KC
Hwang
D000818:Animals; D017209:Apoptosis; D015687:Cell Hypoxia; D053222:Fas Ligand Protein / Q000378:metabolism*; D006801:Humans; D008297:Male; D059630:Mesenchymal Stem Cells / Q000166:cytology / Q000378:metabolism*; D017202:Myocardial Ischemia / Q000628:therapy*; D051381:Rats; D017207:Rats, Sprague-Dawley; D015398:Signal Transduction
C505661:FASLG protein, human; D053222:Fas Ligand Protein