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Published ahead of print on April 15, 2004, doi:10.1164/rccm.200305-659OC
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American Journal of Respiratory and Critical Care Medicine Vol 170. pp. 141-147, (2004)
© 2004 American Thoracic Society

Original Article

Histone Acetylase and Deacetylase Activity in Alveolar Macrophages and Blood Mononocytes in Asthma

Borja G. Cosío, Buphinder Mann, Kazuhiro Ito, Elen Jazrawi, Peter J. Barnes, K. Fan Chung and Ian M. Adcock

Department of Thoracic Medicine, National Heart and Lung Institute, Imperial College Faculty of Medicine, London, United Kingdom

Correspondence and requests for reprints should be addressed to Ian Adcock, Ph.D., Thoracic Medicine, National Heart and Lung Institute, Dovehouse Street, London SW3 6LY, UK. E-mail: ian.adcock{at}imperial.ac.uk

Histone acetylation status is a key factor in the regulation of inflammatory gene transcription. We investigated the activity of histone acetylases (HAT) and deacetylases (HDAC), and the effect of glucocorticoids in alveolar macrophages (AM) and peripheral blood mononuclear cells (PBMC) from subjects with asthma. Bronchoalveolar lavage was performed in 10 patients with intermittent asthma, 8 with persistent asthma, and 10 healthy control subjects. PBMCs and granulocytes were isolated from six patients with mild and severe asthma, before and after a 7-day course of prednisolone (30 mg/day). AMs were isolated for HDAC assay or incubated with dexamethasone (1 µM). HAT activity was increased (1.43 ± 0.1 vs. 1.01 ± 0.1 standard units/10 µg, p < 0.05), and HDAC activity was reduced (3,031 ± 243 vs. 5,004 ± 164 arbitrary fluorescence units/10 µg, p < 0.001) in AMs of subjects with asthma compared with control subjects. Dexamethasone suppressed LPS-induced granulocyte macrophage-colony stimulating factor, tumor necrosis factor-{alpha}, and interleukin-8 release by 83 ± 1%, 51 ± 7% and 20 ± 9% (p < 0.001), respectively. Similar effects were seen on nuclear factor-{kappa}B inhibition, and interleukin-8 release was further reduced by the HDAC enhancer, theophylline (37 ± 6%). Prednisolone increased HDAC activity in PBMCs from subjects with mild asthma. The increased inflammatory response in asthma may be due to reduced HDAC and enhanced HAT activity. Glucocorticoids and theophylline may downregulate the inflammatory response by modulating HAT and HDAC activity, and nuclear factor-{kappa}B activation.

Key Words: inflammation • chromatin remodeling • theophylline • glucocorticoids • asthma




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