@article {Ikemura701, author = {Toshihide Ikemura and Jurgen Schwarze and Mika Makela and Arihiko Kanehiro and Anthony Joetham and Kenji Ohmori and Erwin W. Gelfand}, title = {Type 4 Phosphodiesterase Inhibitors Attenuate Respiratory Syncytial Virus-Induced Airway Hyper-Responsiveness and Lung Eosinophilia}, volume = {294}, number = {2}, pages = {701--706}, year = {2000}, publisher = {American Society for Pharmacology and Experimental Therapeutics}, abstract = {Viral respiratory infections are considered one of the triggers of exacerbations of asthma. In a model of virus-induced airway hyper-responsiveness (AHR), mice infected with human respiratory syncytial virus (RSV) were shown to develop AHR accompanied by lung eosinophilia. Inhibitors of cyclic nucleotide phosphodiesterase (PDE) have been shown to affect airway responsiveness and pulmonary allergic inflammation. In this study, we assessed the effects of type 4 PDE (PDE4) inhibitors on AHR following RSV infection and compared them with a PDE3 inhibitor. In mice infected by intranasal inoculation of RSV, treatment with the PDE4 inhibitor rolipram or Ro-20-1724 reduced both AHR and the eosinophil infiltration of the airways. In contrast, the PDE3 inhibitor, milrinone, did not influence airway responsiveness or eosinophilic inflammation. These results demonstrate that PDE4 inhibitors can modulate RSV-induced AHR and lung eosinophilia and indicate that they have a potential role in treating exacerbations of asthma triggered by viral infection. The American Society for Pharmacology and Experimental Therapeutics}, issn = {0022-3565}, URL = {https://jpet.aspetjournals.org/content/294/2/701}, eprint = {https://jpet.aspetjournals.org/content/294/2/701.full.pdf}, journal = {Journal of Pharmacology and Experimental Therapeutics} }