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ORIGINAL ARTICLE
Year : 2015  |  Volume : 35  |  Issue : 3  |  Page : 111-119

Phosphodiesterase 4B is essential for lipopolysaccharide-induced CC chemokine ligand 3 production in mouse macrophages


1 Department of Life Sciences, National Central University, Jhongli District, Taoyuan City, Taiwan, China
2 Department of Radiology, Taoyuan Armed Forces General Hospital, Taoyuan City; Department of Diagnostic Radiology, National Defense Medical Center, Triservice General Hospital, Taipei, Taiwan, China
3 Department of Diagnostic Radiology, National Defense Medical Center, Triservice General Hospital, Taipei, Taiwan, China
4 Department of Obstetrics, Gynecology, and Reproductive Sciences, University of California San Francisco, California, USA
5 Department of Internal Medicine, Landseed Hospital, Pingjen District, Taoyuan City, China
6 Department of Life Sciences, National Central University, Jhongli District, Taoyuan City, China

Correspondence Address:
S L Catherine Jin
Department of Life Sciences, National Central University, 300 Jhongli District, Taoyuan City, Taiwan
China
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/1011-4564.158674

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Background: Phosphodiesterase 4 (PDE4) inhibitors negatively modulate many inflammatory responses, and some of these pharmacological effects are mediated by inhibition of PDE4B in inflammatory cells. While inactivation of PDE4B, but not other PDE4 isotypes, is known to inhibit lipopolysaccharide (LPS)-induced tumor necrosis factor-α (TNF-α) production in macrophages, a cell type critical in mediating innate immunity, the impact of PDE4B on many other inflammatory responses in these cells remains largely unknown. Materials and Methods: To investigate whether PDE4B regulates additional inflammatory mediators other than TNF-α, in this study we initially used two-dimensional gel electrophoresis approach to screen the secreted proteins that are modulated by the PDE4 inhibitor rolipram in LPS-stimulated Raw 264.7 macrophages. Results: Three proteins were identified, of which the proinflammatory chemokine CC chemokine ligand 3 (CCL3) and cytokine TNF-α were downregulated and the antiinflammatory cytokine interleukin-1 receptor antagonist was upregulated. Further analysis on CCL3 production in mouse peritoneal macrophages revealed that the reduced CCL3 secretion was associated with a substantial decrease in CCL3 mRNA accumulation. The inhibitory effect of rolipram on CCL3 production was mimicked by the protein kinase A activator 6-Bnz-cAMP, but not the exchange protein directly activated by cAMP activator 8-pCPT-2'-O-Me-cAMP. Analysis of PDE4-deficient macrophages showed that ablation of only PDE4B reproduced the rolipram effect on CCL3 production. Moreover, PDE4 inhibitor potentially attenuates T-cell migration to CCL3 in inflammatory sites. Conclusions: These findings suggest that PDE4B may regulate the production of diverse inflammatory mediators in LPS-stimulated macrophages, and an inhibitor with PDE4B selectivity should retain the anti-inflammatory effects of nonselective PDE4 inhibitors in endotoxin-induced inflammatory conditions.


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