Abstract:
:G protein-coupled receptor 154 (GPR154) is a recently discovered asthma susceptibility gene upregulated in the airways of asthma patients. We previously observed increased pulmonary mRNA expression of the murine ortholog Gpr154 in a mouse model of ovalbumin (OVA)-induced inflammation. However, the expression profile of GPR154 in leukocytes and the cellular functions of the receptor and its endogenous agonist neuropeptide S (NPS) have remained unidentified. Here, we characterized the mRNA expression of NPS and GPR154 by using real-time RT-PCR in fractionated human blood cells and in peripheral blood mononuclear cells (PBMCs) with monocyte or T cell activation. The expression of GPR154 in leukocytes was further confirmed by immunoblotting experiments and immunohistochemical staining of human sputum samples. Additionally, we characterized the expression of GPR154 in the lung tissue samples and in the bronchoalveolar lavage (BAL) fluid of OVA sensitized and challenged BALB/c mice. In human blood and sputum cells, monocyte/macrophages and eosinophils were identified as GPR154-positive cells. In PBMCs, monocyte activation with LPS but not T cell activation with anti-CD3/CD28 antibodies resulted in increased NPS and GPR154 expression. In the lung tissue samples and in the BAL fluid of OVA-challenged mice, GPR154 expression was upregulated in alveolar macrophages in comparison to controls. In the mouse macrophage RAW 264.7 cell line, NPS-stimulated Galphas- and Galphaq-dependent phagocytosis of Escherichia coli. The results show that GPR154 is upregulated in macrophages after antigen challenge and that NPS is capable of inducing phagocytosis of unopsonized bacteria.
journal_name
Hum Mol Genetjournal_title
Human molecular geneticsauthors
Pulkkinen V,Majuri ML,Wang G,Holopainen P,Obase Y,Vendelin J,Wolff H,Rytilä P,Laitinen LA,Haahtela T,Laitinen T,Alenius H,Kere J,Rehn Mdoi
10.1093/hmg/ddl090subject
Has Abstractpub_date
2006-05-15 00:00:00pages
1667-79issue
10eissn
0964-6906issn
1460-2083pii
ddl090journal_volume
15pub_type
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