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Phenotype and differentiation of bone marrow‐derived smooth muscle progenitor cells
Author(s) -
Liu Yi,
Liu Manling,
Niu Wen,
Luo Ying,
Zhang Bo,
Li Zhichao
Publication year - 2011
Publication title -
clinical and experimental pharmacology and physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 103
eISSN - 1440-1681
pISSN - 0305-1870
DOI - 10.1111/j.1440-1681.2011.05554.x
Subject(s) - progenitor cell , bone marrow , flow cytometry , microbiology and biotechnology , biology , green fluorescent protein , cd34 , chemistry , stem cell , immunology , gene , biochemistry
Summary 1. Smooth muscle progenitor cells (SPC) are undifferentiated vascular smooth muscle cells implicated in many hyperplastic diseases of the blood vessels. However, few in vitro studies have investigated the characteristics of SPC. 2. In the present study, we constructed a recombinant plasmid with the enhanced green fluorescent protein (GFP) gene and a rat SM22α promoter, which was exclusively promoted in a smooth muscle cell lineage. Constructs were then transferred into adherent mononuclear cells derived from rat bone marrow. After 3 days, GFP‐positive cells, which should be SPC, were isolated by flow cytometry. 3. Flow cytometric analysis and dual immunofluorescent staining showed that the GFP‐positive cells expressed both α‐smooth muscle actin (a specific marker for smooth muscle) and the chemokine receptor CXCR4 (abundant on precursor cells), but not calmodulin or CD31. After stimulation of SPC with 50 ng/mL platelet‐derived growth factor‐BB, CXCR4 levels decreased and calmodulin protein content increased, as determined by western blot analysis. 4. On the basis of these results, we conclude that SPC have dual characteristics of both precursor and smooth muscle cells, and might well differentiate into smooth muscle‐like cells under certain conditions.