REMODELING OF THE TRANSFORMED PHENOTYPE OF CD16+CD32+CD11b+ NEUTROPHILIC GRANULOCYTES OF PATIENTS WITH ATYPICAL CHRONIC BACTERIAL INFECTION IN VITRO

• Main Authors: G A Chudilova, I V Nesterova, L V Lomtatidze, S V Kovaleva, T V Rusinova
• Format: Article
• Language: English
• Published: Peoples’ Friendship University of Russia (RUDN University) 2018-12-01
• Series: RUDN Journal of Medicine
• Subjects: neutrophilic granulocytes; phenotype; subset; chronic sinusitis
• Online Access: http://journals.rudn.ru/medicine/article/viewFile/19697/16313

The research has shown that the functional state of neutrophilic granulocytes (NG) is determined by the state of NG subpopulation phenotype composition in evaluating the simultaneous expression of CD16, CD32, CD11b membrane markers with considering the density of expressed molecules. The change in NG subpopulations phenotype indicates active or defective inclusion of NG in the immune response in inflammation. Various inducers of endo- and exogenous nature activate NG and promote translocation from cytoplasmic granules and vesicles or expression to the surface cytoplasmic membrane of receptor molecules. In this regard, our interest was in studying the expression peculiarities of CD16, CD32, CD11b NG receptors in patients with atypically occurring bacterial infections (chronic sinusitis) and the possibility of remodeling the NG phenotype under the influence of glucosaminylmuramyl dipeptide (GMDP) and IFNγ in vitro. Subjects of this study were blood samples of patients with chronic sinusitis and conditionally healthy individuals. Flow rate cytometry at CYTOMICS FC500 (Beckman Coulter, USA) was used to evaluate the % NGs expressing CD16, CD32, CD11b, and the fluorescence intensity of these molecules (MFI) before and after incubation with the test substances. Flow cytometry (CYTOMICS FC500, Beckman Coulter, USA) were used to evaluate amount (%) of NGs expressing CD16, CD32, CD11b and mean fluorescence intensity of these molecules (MFI) before and after incubation with the test substances. The studies showed that in patients with chronic sinusitis with persistent recurrent course the presence is characterized by transformed phenotype CD16dimCD32midCD11bbr of CD16+CD32+CD11b+NG subpopulation. We have shown that the revealed changes in the level of expression of trigger membrane receptors do not allow NG to fully engage in inflammatory process and to realize its effector and regulatory functions. Under the influence of GMDP and IFNγ regulatory molecules was demonstrated high mobilization capacity of the studied NGs for functionally significant membrane receptors in realization of various functions.