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Characterization of biological and functional features of a new type of CD27- memory B lymphocytes.
Bajzíková, Martina ; Růžičková, Šárka (advisor) ; Šinkora, Marek (referee)
The increased frequencies of two novel B cell populations defined as IgM+ CD19+ CD27- CD21low CD38low CD24+ and IgM+ CD19+ CD27- CD21low CD38low CD24- in peripheral blood of patients with common variable immunodeficiency (CVID) compared to healthy donors were found. The aim was to search for such B cells in patients with rheumatoid arthritis (RA) and their further characterization. The production of immunoglobulin (Ig) mRNA in single B cells was analyzed using flow cytometry, single cell sorting and RT-PCR, IgVH-specific PCR, cycle sequencing and statistical analysis. The study was focused on analysis of variable regions of the heavy chains of Igs and significant differences in the usage of VH, DH and JH gene segments, mutational frequencies, distribution of silent and replacement mutations, length and composition of CDR3 regions, clonal relation and RAG gene expression in above mentioned B cell populations were found. Because of lack of the surface CD27 molecule being regarded as marker of B cells that have undergone antigen-driven germinal reactions, analyzed populations were considered as naive. However, the pattern and type of mutations suggested that these cells could represent a new type of differentiated memory/antigen- experienced B lymphocytes (in CVID less maturated) with the likely role in...
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Dysregulation of immune system in the patients with Common Variable Immunodeficiency
Milota, Tomáš ; Horváth, Rudolf (advisor) ; Stříž, Ilja (referee) ; Freiberger, Tomáš (referee)
This thesis includes set of published experimental results, which were obtained at the Department of Immunology, Second Faculty of Medicine Charles University within the project focused on the basal and applied research of the Primary immunedeficiencies (PID), particularly Common variable immunodeficiency (CVID). The first, theoretical part, is divided into two sections. The first section is dedicated to the general aspects of Primary antibody deficiencies (PAD). The second section is focused on epidemiology, ethiopathogenesis, classification, clinical and therapeutical aspects of CVID. The main consideration is devoted particularly to non-infectious complications, which significantly contribute to morbidity and mortality of CVID patients. The second part consists of the set of publications describing specific mechanisms of immune system dysregulation and their clinical manifestation, which are briefly commented. The spectrum of issues resolved within the project covers following basic aspects: 1) characteristics of lung complications in CVID from the point of view of bronchial asthma, 2) characteristics of associated malignancies, 3) significance of genetic background for the specific treatment, 4) therapy of CVID focused on aspects of immunoglobulin substitution. The results of the other...
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Characterization of biological and functional features of a new type of CD27- memory B lymphocytes.
Bajzíková, Martina ; Růžičková, Šárka (advisor) ; Šinkora, Marek (referee)
The increased frequencies of two novel B cell populations defined as IgM+ CD19+ CD27- CD21low CD38low CD24+ and IgM+ CD19+ CD27- CD21low CD38low CD24- in peripheral blood of patients with common variable immunodeficiency (CVID) compared to healthy donors were found. The aim was to search for such B cells in patients with rheumatoid arthritis (RA) and their further characterization. The production of immunoglobulin (Ig) mRNA in single B cells was analyzed using flow cytometry, single cell sorting and RT-PCR, IgVH-specific PCR, cycle sequencing and statistical analysis. The study was focused on analysis of variable regions of the heavy chains of Igs and significant differences in the usage of VH, DH and JH gene segments, mutational frequencies, distribution of silent and replacement mutations, length and composition of CDR3 regions, clonal relation and RAG gene expression in above mentioned B cell populations were found. Because of lack of the surface CD27 molecule being regarded as marker of B cells that have undergone antigen-driven germinal reactions, analyzed populations were considered as naive. However, the pattern and type of mutations suggested that these cells could represent a new type of differentiated memory/antigen- experienced B lymphocytes (in CVID less maturated) with the likely role in...
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