ADAM33 expression in asthmatic airways and human embryonic lungs
Haitchi, Hans Michael, Powell, Robert M., Shaw, Timothy J., Howarth, Peter H., Wilson, Susan J., Wilson, David I., Holgate, Stephen T. and Davies, Donna E. (2005) ADAM33 expression in asthmatic airways and human embryonic lungs. American Journal of Respiratory and Critical Care Medicine, 171, (9), 958-965. (doi:10.1164/rccm.200409-1251OC).
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Rationale: Polymorphic variation in ADAM33 (A Disintegrin And Metalloprotease) is strongly associated with asthma and bronchial hyperresponsiveness in different populations.
Objective and Methods: To study the role of ADAM33 in asthma, we investigated its expression in normal, asthmatic, and embryonic airways using reverse transcriptase–quantitative polymerase chain reaction and immunochemistry.
Results: Several ADAM33 mRNA splice variants were detected in bronchial biopsies and embryonic lung; however, the ß-isoform and variants encoding the metalloprotease domain were rare transcripts. Western blotting of bronchial biopsies confirmed the presence of multiple isoforms of ADAM33, which had molecular weights of 22, 37, 55, and 65 kD. Immunohistochemistry and laser confocal microscopy of adult bronchial biopsies showed that α–smooth muscle actin and ADAM33 immunoreactivity were mostly colocalized to smooth muscle and isolated cells in the submucosa. There was no significant difference in ADAM33 mRNA amplicons or protein in subjects with asthma compared with control subjects. In developing lung, ADAM33 was found around bronchial tubes; however, immunoreactivity was more widely distributed than α–smooth muscle actin within undifferentiated mesenchyme; on Western blots, an additional 25-kD ADAM33 variant was detected.
Conclusions: Several ADAM33 protein isoforms occur in adult bronchial smooth muscle and in human embryonic bronchi and surrounding mesenchyme, strongly suggesting its importance in smooth muscle development and/or function, which could explain its genetic association with bronchial hyperresponsiveness. The occurrence of ADAM33 in embryonic mesenchymal cells suggests that it may be involved in airway wall "modeling" that contributes to the early life origins of asthma.
|Keywords:||bronchial hyperresponsiveness, epithelial mesenchymal trophic unit, lung development, mesenchymal cells, remodeling|
|Subjects:||R Medicine > RC Internal medicine
Q Science > QH Natural history > QH426 Genetics
|Divisions:||University Structure - Pre August 2011 > School of Medicine > Infection, Inflammation and Repair
University Structure - Pre August 2011 > School of Medicine > Human Genetics
|Date Deposited:||03 Apr 2006|
|Last Modified:||01 Jul 2011 01:44|
|Contact Email Address:||email@example.com|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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