Human Molecular Genetics Advance Access originally published online on August 22, 2006
Human Molecular Genetics 2006 15(19):2923-2935; doi:10.1093/hmg/ddl234
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Downstream target genes of the neuropeptide SNPSR1 pathway
1 Department of Medical Genetics, Biomedicum Helsinki, 2 Department of Dermatology and 3 Department of Anatomy, Biomedicum Helsinki, University of Helsinki, Helsinki, Finland, 4 Department of Biosciences and Nutrition, Clinical Research Centre, Karolinska Institutet, Karolinska University Hospital, Huddinge, Sweden, 5 SIAF, Davos, Switzerland, 6 Department of Allergy and 7 Department of Medicine, Helsinki University Central Hospital, Helsinki, Finland and 8 GeneOS Ltd, Helsinki, Finland and 9 Department of Dermatology, Karolinska Institutet at Stockholm Söder Hospital, Stockholm, Sweden
* To whom correspondence should be addressed. Tel: +358 46 86089158; Fax: +358 46 87745538; Email: juha.kere{at}biosci.ki.se
Received July 5, 2006; Accepted August 11, 2006
The neuropeptide S (NPS)NPS receptor 1 (NPSR1) pathway has recently been implicated in the pathogenesis of asthma. The purpose of this study was to identify downstream gene targets regulated by NPSR1 upon NPS stimulation. A total of 104 genes were found significantly up-regulated and 42 down-regulated by microarray analysis 6 h after NPS administration. By Gene Ontology enrichment analysis, the categories cell proliferation, morphogenesis and immune response were among the most altered. A TMM microarray database comparison suggested a common co-regulated pathway, which includes JUN/FOS oncogene homologs, early growth response genes, nuclear receptor subfamily 4 members and dual specificity phosphatases. The expression of four up-regulated genes, matrix metallopeptidase 10 (MMP10), INHBA (activin A), interleukin 8 (IL8) and EPH receptor A2 (EPHA2), exhibited a significant NPS doseresponse relationship as confirmed by quantitative reverse-transcriptasePCR and for MMP10 by immunoassay. Immunohistochemical analyses revealed that MMP10 and TIMP metallopeptidase inhibitor 3 (TIMP3) were both strongly expressed in bronchial epithelium, and macrophages and eosinophils expressed MMP10 in asthmatic sputum samples. Because remodeling of airway epithelium is a feature of chronic asthma, the up-regulation of MMP10 and TIMP3 by NPSNPSR1 signaling may be of relevance in the pathogenesis of asthma.
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