title: Galectin-3 mediates the effect of PDGF on pulmonary arterial hypertension.
abstract: OBJECTIVE
  The present study aimed to perform in vitro experiments to investigate whether Galectin-3 (Gal-3) mediates the effect of platelet-derived growth factor (PDGF) on pulmonary arterial smooth muscle cells (PASMC) proliferation, apoptosis and migration, and to reveal the mechanism of how Gal-3 functions in the pathogenesis of pulmonary arterial hypertension (PAH).
  
  
  METHODS
  Pulmonary arterial smooth muscle cells (PASMC) were treated with various concentration of PDGF for indicated times, and the expression of Gal-3 was analyzed by western blotting. Gal-3 siRNA was transfected into the PASMC to knock down endogenous Gal-3. MTT assay was performed to examine cell proliferation. Transwell-migration assay was used to determine cell migration ability. Cell apoptosis rate was determined by flow cytometric analysis.
  
  
  RESULTS
  The result showed that the expression of Gal-3 protein was induced by PDGF in a dose- and a time-dependent manner. PDGF contributes to the progression of PAH by inducing cell proliferation and migration, as well as inhibiting cell apoptosis of PASMC. However, these effects of PDGF on PASMC were attenuated by Gal-3 knockdown.
  
  
  CONCLUSIONS
  The present study provided potential evidence about the role of Gal-3 in the pathophysiological mechanisms of PAH. This study firstly demonstrated that Gal-3 could be induced by PDGF in PASMC, and mediates the effect of PDGF on PASMC proliferation, apoptosis and migration, thus contributing to the pathogenesis of PAH.
authors.affiliation: Jiangxi Medical College of Nanchang University Nanchang 330031, Jiangxi, P. R. China ; Department of Respiration, Jiangxi Provincial People's Hospital Nanchang 330006, Jiangxi, P. R. China.
authors.forename: Shaomei
authors.initials: S
authors.lastname: Guo
authors.affiliation: Jiangxi Medical College of Nanchang University Nanchang 330031, Jiangxi, P. R. China ; Department of Orthopaedics, Jiangxi Provincial People's Hospital Nanchang 330006, Jiangxi, P. R. China.
authors.forename: Ziming
authors.initials: Z
authors.lastname: Feng
keywords: Galectin-3; platelet-derived growth factor; pulmonary arterial hypertension