Obese asthmatics are characterized by altered adipose tissue macrophage activation

Publication Type:
Journal Article
Citation:
Clinical and Experimental Allergy, 2018, 48 (6), pp. 641 - 649
Issue Date:
2018-06-01
Metrics:
Full metadata record
Files in This Item:
Filename Description Size
Periyalil_et_al-2018-Clinical_%26_Experimental_Allergy.pdfPublished Version1.07 MB
Adobe PDF
© 2018 John Wiley & Sons Ltd Background: Adipose tissue-derived inflammation is linked to obesity-related comorbidities. This study aimed to quantify and immuno-phenotype adipose tissue macrophages (ATMs) from obese asthmatics and obese non-asthmatics and to examine associations between adipose tissue, systemic and airway inflammation. Methods: Visceral (VAT) adipose tissue and subcutaneous (SAT) adipose tissue were collected from obese adults undergoing bariatric surgery and processed to obtain the stromovascular fraction. Pro-inflammatory (M1) and anti-inflammatory (M2) macrophages were quantified by flow cytometry. Cytospins of induced sputum were stained for differential cell counts. Plasma C-reactive protein (CRP) and CD163 were measured by ELISA. Results: VAT contained a higher number of ATMs compared to SAT. A higher percentage of M1 ATMs was observed in VAT of obese asthmatics compared to obese non-asthmatics. The M1:M2 ratio in VAT was negatively associated with FEV1%. Sputum macrophage count was correlated positively with M1 ATMs and negatively with M2 ATMs in VAT. In obese asthmatics, CRP was positively associated with M1:M2 ratio in VAT. There were no associations with CD163. An elevated ratio of M1:M2 ATMs was observed in VAT of obese asthmatics with increased disease severity. Conclusions and Clinical Relevance: Visceral inflammation with increased pro-inflammatory macrophages (M1) occurs in obese asthma and may be a determinant of systemic inflammation and asthma severity.
Please use this identifier to cite or link to this item: