Suppression of human inflammatory cell function by subtype-selective PDE4 inhibitors correlates with inhibition of PDE4A and PDE4B
Version of Record online: 30 JAN 2009
1999 British Pharmacological Society
British Journal of Pharmacology
Volume 128, Issue 7, pages 1393–1398, December 1999
How to Cite
Manning, C. D., Burman, M., Christensen, S. B., Cieslinski, L. B., Essayan, D. M., Grous, M., Torphy, T. J. and Barnette, M. S. (1999), Suppression of human inflammatory cell function by subtype-selective PDE4 inhibitors correlates with inhibition of PDE4A and PDE4B. British Journal of Pharmacology, 128: 1393–1398. doi: 10.1038/sj.bjp.0702911
- Issue online: 30 JAN 2009
- Version of Record online: 30 JAN 2009
- (Received June 14, 1999, Revised August 20, 1999, Accepted September 1, 1999)
- Cyclic nucleotide phosphodiesterase;
- PDE4 subtypes;
- PDE4 inhibitors;
- T lymphocytes;
- T lymphocyte proliferation;
- tumour necrosis factor α
Of the four major phosphodiesterase 4 (PDE4) subtypes, PDE4A, PDE4B and PDE4D are widely expressed in human inflammatory cells, including monocytes and T lymphocytes. We explored the functional role of these subtypes using ten subtype-selective PDE4 inhibitors, each belonging to one of two classes: (i) dual PDE4A/PDE4B inhibitors or (ii) PDE4D inhibitors.
These compounds were evaluated for their ability to inhibit antigen-stimulated T-cell proliferation and bacterial lipopolysaccharide (LPS)-stimulated tumour necrosis factor α (TNFα) release from peripheral blood monocytes.
All compounds inhibited T-cell proliferation in a concentration-dependent manner; with IC50 values distributed over an approximately 50 fold range. These compounds also inhibited TNFα release concentration-dependently, with a wider (∼1000 fold) range of IC50 values.
In both sets of experiments, mean IC50 values were significantly correlated with compound potency against the catalytic activity of recombinant human PDE4A or PDE4B when analysed by either linear regression of log IC50 values or by Spearman's rank-order correlation. The correlation between inhibition of inflammatory cell function and inhibition of recombinant PDE4D catalytic activity was not significant in either analysis.
These results suggest that PDE4A and/or PDE4B may play the major role in regulating these two inflammatory cell functions but do not rule out PDE4D as an important mediator of other activities in mononuclear leukocytes and other immune and inflammatory cells. Much more work is needed to establish the functional roles of the PDE4 subtypes across a broader range of cellular functions and cell types.
British Journal of Pharmacology (1999) 128, 1393–1398; doi:10.1038/sj.bjp.0702911