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Smooth muscle cell (SMC) proliferation and intimal thickening are hallmark features of atherosclerotic disease, and Chlamydia pneumoniae may contribute to atherogenesis by imparting biological effects on SMCs. An in vitro endothelial cell model and a normocholesterolemic rabbit model were used to test the hypothesis that infection with C. pneumoniae induces SMC growth factor production, SMC proliferation, and aortic intimal thickening. Using reverse-transcriptase polymerase chain reaction, it was demonstrated that C. pneumoniae infection of endothelial cells induced platelet-derived growth factor (PDGF)-B messenger RNA expression. In C. pneumoniae-infected rabbits, maximum intimal thickness (MIT) was significantly greater than that in uninfected animals (P&lt; .0001). MIT correlated with the presence of C. pneumoniae antigen (P= .043) and PDGF-B (P= .002) in aortic tissues, and C. pneumoniae antigen was independently correlated with the presence of PDGF-B in aortic tissues (P= .009). These results suggest that C. pneumoniae-induced SMC proliferation and intimal thickening may be mediated through PDGF-B and may be a molecular mechanism by which C. pneumoniae infection could contribute to atherogenesis.

the journal of infectious diseases (online. university of chicago press)/the journal of infectious diseases

<i>Chlamydia pneumoniae</i>Infection of Endothelial Cells Induces Transcriptional Activation of Platelet‐Derived Growth Factor–B: A Potential Link to Intimal Thickening in a Rabbit Model of Atherosclerosis

Chlamydia pneumoniaeInfection of Endothelial Cells Induces Transcriptional Activation of Platelet‐Derived Growth Factor–B: A Potential Link to Intimal Thickening in a Rabbit Model of Atherosclerosis