Peroxisome proliferator-activated receptor-delta agonist enhances vasculogenesis by regulating endothelial progenitor cells through genomic and nongenomic activations of the phosphatidylinositol 3-kinase/Akt pathway

Circulation
Jung-Kyu HanHyo-Soo Kim

Abstract

Despite the therapeutic potential of endothelial progenitor cells (EPCs) in ischemic vascular diseases, their insufficient numbers limit clinical applications. Peroxisome proliferator-activated receptor (PPAR)-delta belongs to the nuclear hormone receptor superfamily, and its functions in various tissues and cells are almost unexplored, especially with respect to vascular biology. PPAR-delta activation in EPCs phosphorylated Akt, and this phosphorylation was mediated not only by genomic but also by nongenomic pathways through interaction with the regulatory subunit of phosphatidylinositol 3-kinase. PPAR-delta activation with agonist (GW501516 or L-165041) increased the proliferation of human EPCs and protected them from hypoxia-induced apoptosis. In addition, PPAR-delta activation enhanced EPC functions, such as transendothelial migration, and tube formation. These actions by PPAR-delta activation in EPCs were dependent on the phosphatidylinositol 3-kinase/Akt pathway. In ischemic hindlimb of mice models, transplantation of PPAR-delta agonist-treated human or mouse EPCs enhanced blood flow recovery to ischemic limbs compared with vehicle-treated EPCs. In EPCs from PPAR-delta-knockout mice, however, treatment with PPAR-delta ago...Continue Reading

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