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Published online 18 September 2006. doi:10.1083/jcb.200605113
The Rockefeller University Press, 0021-9525 $8.00
JCB, Volume 174, Number 7, 1059-1069
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Article

 HDAC3 is crucial in shear- and VEGF-induced stem cell differentiation toward endothelial cells

Lingfang Zeng1, Qingzhong Xiao1, Andriana Margariti1, Zhongyi Zhang1, Anna Zampetaki1, Seema Patel1, Maurizio C. Capogrossi2, Yanhua Hu1, and Qingbo Xu1

1 Department of Cardiac and Vascular Sciences, St. George's, University of London, London SW17 0RE, England, UK
2 Laboratory of Vascular Pathology, Istituto Dermopatico dell'Immacolata, Istituto di Ricovero e Cura a Carattere Scientifico, 104-00167 Rome, Italy

Correspondence to Qingbo Xu: qxu{at}sgul.ac.uk

Reendothelialization involves endothelial progenitor cell (EPC) homing, proliferation, and differentiation, which may be influenced by fluid shear stress and local flow pattern. This study aims to elucidate the role of laminar flow on embryonic stem (ES) cell differentiation and the underlying mechanism. We demonstrated that laminar flow enhanced ES cell–derived progenitor cell proliferation and differentiation into endothelial cells (ECs). Laminar flow stabilized and activated histone deacetylase 3 (HDAC3) through the Flk-1–PI3K–Akt pathway, which in turn deacetylated p53, leading to p21 activation. A similar signal pathway was detected in vascular endothelial growth factor–induced EC differentiation. HDAC3 and p21 were detected in blood vessels during embryogenesis. Local transfer of ES cell–derived EPC incorporated into injured femoral artery and reduced neointima formation in a mouse model. These data suggest that shear stress is a key regulator for stem cell differentiation into EC, especially in EPC differentiation, which can be used for vascular repair, and that the Flk-1–PI3K–Akt–HDAC3–p53–p21 pathway is crucial in such a process.

L. Zeng and Q. Xiao contributed equally to this paper.

Abbreviations used in this paper: DM, differentiation medium; EC, endothelial cell; eNOS, endothelial nitric oxide synthase; EPC, endothelial progenitor cell; ES, embryonic stem; HDAC, histone deacetylase; HE, hematoxylin and eosin; MOI, multiplicity of infection; Sca, stem cell antigen; TSA, trichostatin A; VEGF, vascular endothelial growth factor.


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