eISSN: 1644-4124
ISSN: 1426-3912
Central European Journal of Immunology
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vol. 39

Clinical immunology
Expression of CD11b and CD18 on polymorphonuclear neutrophils stimulated with interleukin-2

Bahaa K.A. Abdel-Salam
Hossam Ebaid

(Centr Eur J Immunol 2014; 39 (2): 209–215)
Online publish date: 2014/06/27
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Background: Interleukin-2 (IL-2) is a lymphocyte-activating and growth-promoting factor, and has been widely studied on T-cells and NK-cells. However, the interaction of polymorphonuclear neutrophils (PMNs) with IL-2 is poorly studied and thus, this study aimed at defining IL-2 participation in the expression of CD11b and CD18 on PMNs.

Material and methods: PMNs were isolated from heparinized whole blood of healthy donors. Purified cells were incubated with IL-2 (10 ng/ml) for 24 hours at 37°C in a humidified incubator with 5% CO2. After 24 hours’ incubation, surface molecules (CD11b and CD18) were measured by flow cytometry.

Results: Interestingly, the antibodies of IL-2Rβ chain (CD122-FITC) were found in all observed cells. The induction of CD11b mean fluorescence intensity (MFI) in highly purified PMNs stimulated with IL-2 was clearly increased recording 43% in comparison to the freshly isolated PMNs and the un-stimulated PMNs which were found to be 23% and 28% of CD11b, respectively. Furthermore, flow cytometry analysis demonstrated that the highly purified PMNs exposed to IL-2 showed an increase in CD18 MFI, recording 47% with respect to that of the freshly isolated PMNs and PMNs cultured with the medium alone which showed a small amount of 38% and 27%, respectively.

Conclusions: Results demonstrated that CD11b and CD18 had been acquired on the surface of the IL-2-in vitro-activated PMNs. These findings indicated that IL-2 may play a crucial role in PMNs migration.

IL-2, IL-2Rβ chain, PMNs, adhesion molecules (CD11b, CD18)

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