Published ahead of print on June 19, 2003, doi:10.1164/rccm.200212-1490OC
Am. J. Respir. Crit. Care Med., Volume 168, Number 8, October 2003, 976-982
A more recent version of this article appeared on October 15, 2003
Submitted on January 28, 2003
Accepted on June 16, 2003
Anti-inflammatory effects of the phosphodiesterase 4 inhibitor cilomilast (Ariflo) in COPD
Elizabeth Gamble1, Diana C Grootendorst2, Christopher E Brightling3, Susannah Troy4, Yusheng Qui5, Jie Zhu5, Debbie Parker3, Antonio M Vignola6, Claus Kroegel7, Ferran Morell8, Trevor T Hansel9, Stephen I Rennard10, Christopher Compton4, Amit Ohad11, Tat Tri12, Jeffrey Edelson11, Ian D Pavord3, Klaus F Rabe3, Neil C Barnes1, and Peter K Jeffery5*
1 Respiratory Medicine, London Chest Hospital, London, United Kingdom,
2 Pulmonology, Leiden University Medical Centre, Leiden, The Netherlands,
3 Respiratory Medicine, Glenfield Hospital, Leicester, United Kingdom,
4 Glaxo Smithkline Pharmaceuticals, Harlow, United Kingdom,
5 Lung Pathology and Gene Therapy, Faculty of Medicine, Imperial College, Royal Brompton Hospital, London, United Kingdom,
6 Instituto di Fisiopatologia Respiratoria, Palerma, Italy,
7 Pneumology and Allergy, University Medical Clinic, Jena, Germany,
8 Servei de Pneumologia, Clinica Tres Torres, Hopital Vall d'Hebron, Barcelona, Spain,
9 Royal Brompton Hospital, London, United Kingdom,
10 University of Nebraska Medical Center, Omaha, NE, USA,
11 Glaxo Smithkline Pharmaceuticals, Collegeville, PA, USA,
12 Imperial College School of Medicine, London, United Kingdom
* To whom correspondence should be addressed. E-mail: p.jeffery{at}ic.ac.uk.
Cilomilast (Ariflo), a new oral phosphodiesterase-4 (PDE4) selective inhibitor, improves lung function in chronic obstructive pulmonary disease (COPD). We have evaluated its anti-inflammatory effects in fifty-nine patients with COPD randomized to receive cilomilast 15mg bid or placebo for 12 weeks. Induced sputum differential cell counts were obtained at baseline and at 5 further visits. IL-8 and neutrophil elastase were measured in sputum supernatant. Bronchial biopsies obtained at baseline and week 10 were immunostained and counted for neutrophils, CD8+ and CD4+ T-lymphocyte subsets and CD68+ macrophages. Cells expressing the genes for IL-8 and TNF were identified by in-situ hybridisation and quantified. Compared to placebo, ANOVA analysis of the change from baseline showed that cilomilast did not alter any sputum endpoint, nor FEV1. However, bronchial biopsies demonstrated that cilomilast treatment was associated with reductions in CD8+ (p=0.001: ANOVA) and CD68+ cells (p<0.05; ANOVA). In addition, by Poisson analysis, comparison of cell counts analyzed as a ratio of active to placebo demonstrated reductions of CD8+(48% p<0.01) and CD68+(47% p=0.001) cells. This is the first demonstration of reduction by any agent of airway tissue inflammatory cells characteristic of COPD. PDE4 inhibitors represent a promising new class of anti-inflammatory treatment in this disease.
Key words: inflammation, bronchial biopsy, induced sputum, emphysema, chronic bronchitis
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