title: Increased expression of pigment epithelium-derived factor in aged mesenchymal stem cells impairs their therapeutic efficacy for attenuating myocardial infarction injury.
abstract: OBJECTIVE
  Mesenchymal stem cells (MSCs) can ameliorate myocardial infarction (MI) injury. However, older-donor MSCs seem less efficacious than those from younger donors, and the contributing underlying mechanisms remain unknown. Here, we determine how age-related expression of pigment epithelium-derived factor (PEDF) affects MSC therapeutic efficacy for MI.
  
  
  RESULTS
  Reverse transcriptase-polymerized chain reaction  and enzyme-linked immunosorbent assay analyses revealed dramatically increased PEDF expression in MSCs from old mice compared to young mice. Morphological and functional experiments demonstrated significantly impaired old MSC therapeutic efficacy compared with young MSCs in treatment of mice subjected to MI. Immunofluorescent staining demonstrated that administration of old MSCs compared with young MSCs resulted in an infarct region containing fewer endothelial cells, vascular smooth muscle cells, and macrophages, but more fibroblasts. Pigment epithelium-derived factor overexpression in young MSCs impaired the beneficial effects against MI injury, and induced cellular profile changes in the infarct region similar to administration of old MSCs. Knocking down PEDF expression in old MSCs improved MSC therapeutic efficacy, and induced a cellular profile similar to young MSCs administration. Studies in vitro showed that PEDF secreted by MSCs regulated the proliferation and migration of cardiac fibroblasts.
  
  
  CONCLUSIONS
  This is the first evidence that paracrine factor PEDF plays critical role in the regulatory effects of MSCs against MI injury. Furthermore, the impaired therapeutic ability of aged MSCs is predominantly caused by increased PEDF secretion. These findings indicate PEDF as a promising novel genetic modification target for improving aged MSC therapeutic efficacy.
authors: Department of Cardiovascular Surgery, Institute of Cardiovascular Disease of Chinese PLA, Xijing Hospital, the Fourth Military Medical University, No.127, West Changle Road, Xi'an, Shaanxi Province 710032, China.
authors: Hongliang
authors: H
authors: Liang
authors: Huiyuan
authors: H
authors: Hou
authors: Wei
authors: W
authors: Yi
authors: Guodong
authors: G
authors: Yang
authors: Chunhu
authors: C
authors: Gu
authors: Wayne Bond
authors: WB
authors: Lau
authors: Erhe
authors: E
authors: Gao
authors: Xinliang
authors: X
authors: Ma
authors: Zifan
authors: Z
authors: Lu
authors: Xufeng
authors: X
authors: Wei
authors: Jianming
authors: J
authors: Pei
authors: Dinghua
authors: D
authors: Yi
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