Laminin α4 contributes to airway remodeling and inflammation in asthma

Prabhala, P., Wright, D. B., Robbe, P., Bitter, C., Pera, T., Ten Hacken, N. H. T., van den Berg, M., Timens, W., Meurs, H. & Dekkers, B. G. J., Dec-2019, In : American Journal of Physiology - Lung Cellular and Molecular Physiology. 317, 6, p. L768-L777 10 p.

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  • Laminin α4 contributes to airway remodeling and inflammation in asthma

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  • Laminin α4 contributes to airway remodeling and inflammation in asthma

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Airway inflammation and remodeling are characteristic features of asthma, both contributing to airway hyperresponsiveness (AHR) and lung function limitation. Airway smooth muscle (ASM) accumulation and extracellular matrix deposition are characteristic features of airway remodeling, which may contribute to persistent AHR. Laminins containing the α2 chain contribute to characteristics of ASM remodeling in vitro and AHR in animal models of asthma. The role of other laminin chains, including the laminin α4 and α5 chains, which contribute to leukocyte migration in other diseases, is currently unknown. The aim of the current study was to investigate the role of these laminin chains in ASM function and in AHR, remodeling and inflammation in asthma. Expression of both laminin α4 and α5 was observed in the human and mouse ASM bundle. In vitro, laminin α4 was found to promote a pro-proliferative, pro-contractile and pro-fibrotic ASM cell phenotype. In line, treatment with laminin α4 and α5 function-blocking antibodies reduced allergen-induced increases in ASM mass in a mouse model of allergen-induced asthma. Moreover, eosinophilic inflammation was reduced by the laminin α4 function-blocking antibody as well. Using airway biopsies from healthy subjects and asthmatic patients, we found inverse correlations between ASM α4 chain expression and lung function and AHR, whereas eosinophil numbers correlated positively with expression of laminin α4 in the ASM bundle. This study for the first time indicates a prominent role for laminin α4 in ASM function and in inflammation, AHR and remodeling in asthma, whereas the role of laminin α5 is more subtle.

Original languageEnglish
Pages (from-to)L768-L777
Number of pages10
JournalAmerican Journal of Physiology - Lung Cellular and Molecular Physiology
Issue number6
Early online date25-Sep-2019
Publication statusPublished - Dec-2019

ID: 98232783