Immunophenotypes of systemic lupus erythematosus – features of clinical and laboratory disorders

The aim – to evaluate subpopulations of B lymphocytes and features of interferon (IFN) status in patients with systemic lupus erythematosus (SLE), to clarify the relationship of immunological parameters with clinical manifestations of the disease Material and methods. 139 patients (123 (88%) women and 16 (12%) men) with a definite diagnosis of SLE were included in the analysis. The disease duration was 3.0 [0.3; 12.0] years, SLEDAI-2K (Systemic Lupus Erythematosus Disease Activity Index 2000) – 7 [4; 11] points, SDI (Systemic Lupus International Collaborating Clinics Damage Index) – 0 [0; 1] points. Immunophenotyping of peripheral blood lymphocytes, including determination of B cells, the general population of memory B cells, non-switched and switched memory B cells, naive, transient B cells, and plasmablasts was carried out using multicolor flow cytometry. IFN status was assessed by the expression of IFN-stimulated genes ( MX1 , RSAD2 , EPSTI1 ) using real-time polymerase chain reaction Results. Two immunological “patterns” were identified – the prevailing immunological mechanism of the pathogenesis of the disease – SLE – with predominant activation of type I IFN and with predominant activation of the B cell component of the immune system. The immunological phenotype with activation of type I IFN was associated with high immunological activity, predominant skin damage, leukopenia, and the phenotype with predominant activation of the B cell link was associated with damage to the kidneys and nervous system. Conclusion. The results of the work suggest a wide variety of immune mechanisms underlying the pathogenesis of SLE. It is possible to identify a number of leading molecular “patterns” of the pathogenesis of the disease, which must be taken into account to select an effective “targeted” drug.