GM-CSF treatment prevents respiratory syncytial virus-induced pulmonary exacerbation responses in postallergic mice by stimulating alveolar macrophage maturation

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• 作者：Thomas Naessens ; PhD^a ; Bert Schepens ; PhD^a ; ^b ; Muriel Smet ; PhD^a ; Charlotte Pollard ; PhD^a ; Lien Van Hoecke ; MSc^a ; Ans De Beuckelaer ; MSc^a ; Monique Willart ; PhD^b ; ^c ; Bart Lambrecht ; MD ; PhD^b ; ^c ; Stefaan De Koker ; PhD^a ; Xavier Saelens ; PhD^a ; ^b ; Johan Grooten ; PhD^a ; ^{Johan.Grooten@ugent.be" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Allergic asthma ; respiratory syncytial virus&ndash ; induced exacerbation ; alveolar macrophage ; GM-CSF
• 刊名：Journal of Allergy and Clinical Immunology
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：137
• 期：3
• 页码：700-709.e9
• 全文大小：2196 K

文摘

Human respiratory syncytial virus (RSV) is a frequent cause of asthma exacerbations, yet the susceptibility of asthmatic patients to RSV is poorly understood.

Objective

We sought to address the contribution of resident alveolar macrophages (rAMs) to susceptibility to RSV infection in mice that recovered from allergic airway eosinophilia.

Methods

Mice were infected with RSV virus after clearance of allergic airway inflammation (AAI). The contribution of post-AAI rAMs was studied in vivo by means of clodronate liposome–mediated depletion, adoptive transfer, and treatment with recombinant cytokines before RSV infection.

Results

After clearing the allergic bronchial inflammation, post-AAI mice had bronchial hyperreactivity and increased inflammatory cell influx when infected with RSV compared with nonallergic mice, whereas viral clearance was comparable in both mouse groups. Post-AAI rAMs were necessary and sufficient for mediating these proinflammatory effects. In post-AAI mice the residing CD11c^hi autofluorescent rAM population did not upregulate the terminal differentiation marker sialic acid–binding immunoglobulin-like lectin F and overproduced TNF and IL-6 through increased nuclear factor κB nuclear translocation. In line with these results, post-AAI lungs had reduced levels of the rAM maturation cytokine GM-CSF. Intratracheal administration of GM-CSF induced final rAM maturation in post-AAI mice and prevented the increased susceptibility to RSV-induced hyperreactivity and inflammation.

Conclusion

Defective production of GM-CSF leads to insufficient post-AAI rAM maturation in mice that recovered from an AAI, causing increased susceptibility to RSV-induced immunopathology. Promoting the differentiation of post-AAI rAMs might be a therapeutic option for preventing RSV-induced exacerbations in human asthmatic patients.