['Cytomegalovirus (CMV) infection is a risk factor for the development of obliterative bronchiolitis (OB) after lung transplantation.', 'In the rat tracheal allograft model, rat CMV (RCMV) infection is associated with accelerated OB through enhanced alloimmune activation and increased smooth muscle cell (SMC) proliferation. Using this model, we investigated the role of platelet-derived growth factor (PDGF) in RCMV infection-enhanced OB.', 'Immunohistochemistry and in situ hybridization revealed that RCMV infection significantly up-regulates PDGF ligand and receptor expression in inflammatory and SMC-like cells in tracheal allografts. Selective inhibition of PDGF receptor tyrosine kinase activity by CGP 53716 prevents the development of OB in RCMV-infected allograft recipients.'] Does platelet-derived growth factor regulate cytomegalovirus infection-enhanced obliterative bronchiolitis in rat tracheal allografts?