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. 1995 May;100(2):314–318. doi: 10.1111/j.1365-2249.1995.tb03670.x

Blood monocytes of untreated asthmatics exhibit some features of tissue macrophages.

A Rivier 1, J Pène 1, H Rabesandratana 1, P Chanez 1, J Bousquet 1, A M Campbell 1
PMCID: PMC1534333  PMID: 7538057

Abstract

Airway macrophages are activated in asthmatic subjects. Peripheral blood monocytes from these subjects present some functional features of activation, but their membrane markers are not known. Recently a new subtype of blood monocytes, CD14+/CD16+, has been identified which possesses the characteristics of tissue macrophages. A study was carried out on nine normal subjects and 11 untreated asthmatics having variable severities of the disease to examine the phenotypic characteristics of monocytes. CD14, CD16, HLA-DR, CD11a, CD11b, CD44 and CD54 were studied using double fluorescence flow cytometry since these antigens have been defined in the CD14+/CD16+ monocytes. The functional activation of monocytes was examined using the release of superoxide anion. The co-expression of CD14 and CD16 by monocytes in terms of percentage and mean fluorescence intensity was significantly higher in asthmatics (P < 0.002 and P < 0.0001, respectively, Mann-Whitney U-test). There was no difference for the other membrane markers between asthmatics and normal subjects. Superoxide anion release was significantly increased in asthmatic subjects (P < 0.01). This study shows that most blood monocytes of asthmatics are CD14+/CD16+ and are likely to present features of tissue macrophages.

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Selected References

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