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Вестник РУДН. Серия: МЕДИЦИНА 2023;27(4)
RUDN Journal of MEDICINE. ISSN 2313-0245 (Print). ISSN 2313-0261 (Online) http://journals.rudn.ru/medicine
IMMUNOLOGY ИММУНОЛОГИЯ
DOI: 10.22363/2313-0245-2023-27-4-470-482 EDN: IUGAPQ
ORIGINAL RESEARCH ОРИГИНАЛЬНОЕ ИССЛЕДОВАНИЕ
Mechanisms of Regulation Allergic and Autoimmune Reactions
by Bacterial Origin Bioregulators
Svetlana V. Guryanova1, 2 Ilya A. Sigmatulin3 Olga O. Gigani2 Sofia A. Lipkina3
1 M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Moscow, Russian Federation
2 RUDN University, Moscow, Russian Federation 3 Lomonosov Moscow State University, Moscow, Russian Federation [SI [email protected]
Abstract: Relevance. The increase in allergic and autoimmune diseases observed in recent decades highlights the need for therapy and prevention, which requires detailed research into the mechanisms of their occurrence. The onset and progression of allergic and autoimmune diseases are influenced by genetic predisposition, lifestyle, environmental factors, and disruptions in the coordinated operation of the immune system, and as a consequence of immune homeostasis. Treatment of these diseases is primarily symptomatic and often accompanied by undesirable side effects. Immune system disorders in various pathologies have their own characteristics for each type of disease, and at the same time have common mechanisms. Considering the presence of a large number of various microorganisms in the human body, taking their influence into account is of paramount importance. Microorganisms are a source of biologically active molecules, the action of which can either prevent and reduce the severity of the disease or exacerbate it. The aim of this study was to analyze the cytokine profile of the effects of fragments of cell walls of Gram-negative and Gram-positive bacteria — lipopolysaccharide (LPS) and muramyl peptide (MP), as well as nisin — an antimicrobial peptide of bacterial origin on human mononuclear cells. Materials and Methods. Mononuclear cells were obtained from peripheral blood of healthy volunteers using Cell separation media Lympholyte CL 5015, and were cultured in the presence of LPS, GMDP and bacteriocin nisin. The cytokine activity of LPS, GMDP and bacteriocin nisin was examined using the multiplex cytokine analysis; the analysis of surface markers was determined flow cytometry. Results and Discussion. It was shown that bacterial cell wall fragments to a much greater extent than nisin induce the production of cytokines, chemokines, and growth factors. It was established that LPS and MP increase the expression of CD11c on dendritic cells, while bacteriocin nisin does not affect the increase of CD11c+ DCs. LPS and MP in the conducted ex vivo studies did not affect the emergence of CCR7.
© Guryanova S.V., Sigmatulin I.A., Gigani O.O., Lipkina S.A., 2023
@ I This work is licensed under a Creative Commons Attribution 4.0 International License https://creativecommons.org/licenses/by-nc/4.0/legalcode
Conclusion. Bacterial origin bioregulators trigger a negative feedback mechanism by inducing the synthesis of anti-inflammatory factors, that can prevent the inflammatory process. Understanding the molecular mechanisms of the influence of bacterial origin bioregulators on the human body opens new approaches in the prevention and development of personalized therapy strategies.
Keywords: innate immunity, immune homeostasis, allergy, autoimmunity, tolerance, LPS, lipopolysaccharide, glucosaminylmuramyldipeptide, muramyl peptide, nisin, inflammation regulation, bacterial origin bioregulators
Funding: This paper has been supported by the RUDN University Strategic Academic Leadership Program.
Author Contributions: Conceptualization — S.V. Guryanova; methodology — S.V. Guryanova; validation — S.V. Guryanova; investigation, formal analysis S.A. Lipkina, I.A. Sigmatulin, O.O. Gigani; S.V. Guryanova; writing — S.V. Guryanova, S.A. Lipkina, I.A. Sigmatulin, O.O. Gigani. All authors have read and agreed to the final version of the manuscript.
Conflicts of interest statement. The authors declare no conflict of interest.
Acknowledgments — not applicable.
Ethics approval. The study protocol was approved by Ethics Committee of the RUDN University.
Consent for publication — not applicable. Voluntary written informed consent was obtained from all subjects involved in the study with an agreement to take part in the study, personal data processing and publishing this paper.
Received 04.09.2023. Accepted 03.10.2023.
For citation: Guryanova SV, Sigmatulin IA, Gigani OO, Lipkina SA. Mechanisms of regulation allergic and autoimmune reactions by bacterial origin bioregulators. RUDN Journal of Medicine. 2023;27(4):470-482. doi: 10.22363/2313-0245-202327-4-470-482
Introduction
Allergic and autoimmune diseases represent two main categories of immune dis-orders affecting a significant number of people worldwide. These diseases are characterized by abnormal immune responses, but differ in their mechanisms and impact on the body [1, 2]. Allergic and autoimmune diseases have reached epidemic proportions and currently affect more than one billion people [3].
Allergic diseases are characterized by the immune system's hyperreactivity to external allergens such as pollen, dust, animals, and certain foods. The most common forms of allergic diseases are asthma, atopic dermatitis (AD), allergic rhinitis, and food allergy [4]. Currently, 10 % of children suffer from food allergy, and 20-25 % of adults have at least one allergic disease [5, 6]. According to the 2019 Global Burden of Disease study, there were 262 million cases of asthma and 171
million cases of AD worldwide in 2019; the 3416 and 2277 per 100,000 population, respectively, for asthma and AD [7-9]. A sharp increase in prevalence has been noted in developed countries over the past few decades, and an increase in incidence is expected in developing countries [6].
Autoimmune diseases occur when the immune system mistakenly attacks the body's own cells and tissues. This includes diseases such as rheumatoid arthritis, systemic lupus erythematosus, celiac disease, and many others [10]. The prevalence of autoimmune diseases is increasing and is estimated at 10.2 % based on the study of electronic medical records of more than 22 million people [11]. The annual growth of the overall morbidity and prevalence of autoimmune diseases worldwide is 19.1 % and 12.5 % respectively [12], with 63.9 % of these diagnosed individuals being women and 36.1 % men [11]. The
predominance of women with autoimmune diseases is also noted in other studies [10]. The mechanisms of autoimmune reactions are divided into two fundamental pathological processes — autoimmunity and autoinflammation, which can potentiate each other [13]. Autoimmunity is associated with the disruption of immunological tolerance to normal tissue proteins (autoantigens), is associated with the predominance of acquired (adaptive) immunity activation, and is manifested by hyperproduction of autoantibodies. Autoinflammation, in turn, is considered as a pathological process based on the genetically determined (or induced) activation of innate immunity [13-17].
Allergic and autoimmune diseases are of global significance, as they affect the health of millions of people. Each category has its unique challenges in the field of management and treatment. Allergic diseases most often require symptom management and prevention of allergen exposure, while autoimmune diseases often require a more complex approach to treatment, including suppression of the immune system and identification of underlying causes. Existing management and treatment strategies significantly improve the quality of life of patients, but often do not achieve the goal of long-term remission without appropriate therapy [18]. An important aspect of managing these diseases is early diagnosis, which allows for treatment to begin at the most effective time and minimizes the risk of long-term complications [19]. In the context of allergic diseases, key strategies include avoiding allergens and using medications such as antihistamines, corticosteroids, and inhalers to control symptoms [4, 20-22]. In some cases, immunotherapy aimed at reducing sensitivity to allergens may be recommended [1, 2]. In the case of autoimmune diseases, the treatment approach often includes immunosuppressive drugs to reduce immune system activity and inflammation [2]. Individual treatment plans may include the use of nonsteroidal anti-inflammatory drugs (NSAIDs), biological agents, and immune response modifiers, which can have local and systemic side effects [2, 23]. Side effects of antihistamines can include
drowsiness, blurred vision, dry mouth, constipation or difficulty urinating, headache, and fatigue. Nasal corticosteroids can include nose irritation, nosebleeds, headache, and sometimes perforation of the nasal septum with prolonged use. Long-term use of oral corticosteroids can cause side effects including weight gain, increased risk of infections, osteoporosis, increased blood pressure, and sleep disturbances. Decongestants used to relieve nasal congestion can cause insomnia, headache, increased blood pressure, and irritability. Immunotherapy (allergen-specific immunotherapy) can lead to allergic reactions, including skin reactions at the injection site, nasal congestion, throat itching, or, in rare cases, anaphylaxis. Side effects of biological drugs used to treat severe allergic diseases such as asthma can include headache, injection site reactions, increased risk of infections, renal failure, and slowed growth in children [24-28]. In severe cases, an anaphylactic reaction with serious consequences can develop [29].
Among the mechanisms and risk factors for the pathophysiology of allergic and autoimmune diseases, the presence of various and common factors is identified, including genetic, environmental factors, lifestyle, and response to the microbiome [3, 10, 30]. The microbiome is assigned a key role in the development and evolution of these diseases [3, 31]. A significant part of the human microbiome is concentrated in the gut, mostly in the colon and the proximal part of the small intestine [32, 33]. Bacteria residing in the gut are a source of biologically active substances, and they also help the host digest complex foods and synthesize necessary metabolites, such as vitamins B and K [34, 35]. Metabolites and bacterial components regulate the host's immune response by affecting the proliferation, migration, differentiation, and effector functions of immune cells and influence the development of allergic diseases [36, 37]. Key mechanisms of action of bacterial origin bioregulators (BOBs) affect their impact on humoral and cellular factors, modulating both links of immunity — innate and adaptive. BOBs modulate the reactivity of the immune system: they can stimulate the immune system to a higher or lower than normal response to
allergens. For example, lipopolysaccharide (LPS), the main component of the outer surface membrane of gram-negative bacteria [38], increases the level of inflammatory cytokines [39-41], which in turn can enhance allergic and autoimmune reactions [42, 43]. It is important to note the complex mechanism of regulation of inflammatory reactions by lipopolysaccharide: prolonged exposure to LPS induces the production of anti-inflammatory cytokines and transcription factors that limit inflammation [40, 44, 45]. Muramyl peptide (MP), a component of the cell walls of gram-positive bacteria, also has a dual effect; the primary impact of MP stimulates pro-inflammatory reactions, while with prolonged exposure MP generates anti-inflammatory factors [44]. Dysregulation of the adequate immune response to BOBs exacerbates the course of allergic and autoimmune diseases [46, 47].
Mechanisms of action of bacterial origin bioregulators can be carried out through corresponding receptors of innate immunity or directly, affecting cell membranes. For example, LPS exerts its activity through TLR4, muramyl peptides activate NLRs, while antimicrobial peptides produced by bacteria and called bacteriocins can have a nonspecific effect due to amphiphilicity and electrostatic interaction with the eukaryotic membranes [48-51]. Conflicting results of the effects of bacterial origin bioregulators require further research to accurately predict their effects and influence on the initiation and progression of allergic and autoimmune diseases. The aim of the current study was to determine the influence of LPS, MP, and bacteriocin nisin on humoral factors — cytokine production, as well as on the change in phenotype of dendritic cells, which take an active part in innate immunity and the formation of tolerance.
Materials and Methods
Isolation of mononuclear cells
Blood was collected with the written informed consent of healthy donors aged 20-22 years. The experiment protocol was approved by the University's Ethical Commission, N 21 from 11.10.2021. Peripheral
blood was collected in tubes (Vacuette, Greiner Bio-One, Austria) with anticoagulant (0.1 ml of 2.7 % EDTA solution; pH 7.2-7.4 per 1 ml of blood). Whole blood was diluted in a 1:3 ratio with phosphate-buffered saline (PBS, PanEco, Moscow, Russia), layered onto Cell separation media Lympholyte CL 5015 (Cedarlane Laboratories Limited, Ontario, Canada), and centrifuged for 40 min at 400 G. Mononuclear cells (MNCs) were washed twice (10 min; 1000 rpm) by centrifugation in excess PBS and resuspended in complete RPMI 1640 medium (Gibco, Waltham, MA, USA), containing 10 % fetal bovine serum, 100 U/ml penicillin, 100 pg/ml streptomycin, and 10 mM Hepes buffer (pH 7.2) (PanEco, Moscow, Russia). Cell viability was determined by trypan blue staining.
Cultivation of human mononuclear cells in the presence of LPS, MP, and bacteriocin nisin to determine cytokine activity
Mononuclear cells were added to the wells of a 96-well round-bottom plate (Costar, Washington, WA, USA), at 0.2 x106 per well, and glucosaminylmuramyldipeptide (MP, GMDP) was added at a final concentration of 5 pg/ml, with lipopolysaccharide (LPS) (1 pg/ml), bacteriocin nisin (1 ng/ml), and an equal volume of medium to control wells. Concentrations were determined by preceding experiments and corresponded to the maximum plateau values [52]. The plates were incubated for 4 hours at 37 °C in a 5 % CO2 atmosphere, the supernatant was collected, and cytokines were tested.
Multiplex cytokine analysis
Multiplex cytokine analysis was performed using magnetic beads with antibodies for the determination of human cytokines/chemokines using the Luminex 200, Merck (Millipore) equipment, and software (Burlington, Massachusetts, USA). For this purpose, supernatants of mononuclear cells, previously cultured with LPS, MP, nisin, and phosphate buffer as a control, were collected and analyzed according to the manufacturer's instructions. Assays included a bead-based fluorescence MILLIPLEX® assay/ Luminex fluorescence platform (LMX).
Cultivation of human blood cells in the presence of LPS, MP, and bacteriocin nisin to determine surface markers
Peripheral blood was collected in tubes (Vacuette, Greiner Bio-One, Austria) with anticoagulant (0.1 ml of 2.7 % EDTA solution; pH 7.2-7.4 per 1 ml of blood) and MP was added at a final concentration of 5 pg/ml, with LPS (1 pg/ml), bacteriocin nisin (1 ng/ml), and an equal volume of medium to control samples.
Flow cytometry
For the analysis of surface markers, blood samples were incubated with 2 pM of LPS, MP, and nisin for 1 h at +36 °C and then with specific antibodies for 1 h at +4 °C, washed, and measured on a CytoFLEX device (Beckman Coulter LS, Indianapolis, USA), data was analyzed by CytExpert software. Phenotyping was performed using markers HLA-DR PE-Cy5, CD11c APC, CD123 APC-eFluor780, CCR7 PE-Cy7 against CD3, CD20, CD56, CD14; CD80, CD83 markers. MDC populations were determined by HLADR+ CD3- CD14- CD20- CD56-CD11c+ CD123-, PDC was determined by markers HLA-DR+ CD3- CD14- CD20- CD56- CD11c + CD123+ FITC (BD Biosciences, USA).
Statistics
Statistical analysis was conducted using MS Excel software. Data are presented as the mean ± SEM of at least two independent experiments or as one representative experiment of two. For determining intergroup differences of independent samples and assessing their statistical significance with a normal distribution, an unpaired Student's t-test was applied. Significance levels of p < 0.05 were considered statistically reliable.
Results and Discussion
The influence of LPS, MP, and bacteriocin nisin on cytokine production
Allergic and autoimmune diseases develop as a result of an aberrant body reaction to harmless antigens or antigens of one's own tissues with direct regulation by cytokines and chemokines. The study of the influence
of LPS, MP, and bacteriocin nisin on the production of cytokines by mononuclear cells from healthy donors using a fluorescent method showed significant differences in their ability to stimulate the production of cytokines, chemokines, and growth factors. The analysis of the levels of production of cytokines, chemokines, and growth factors under the influence of bacterial origin bioregulators has established that muramylpeptide and lipopolysaccharide have the most active influence (Fig. 1).
LPS and MP increased almost all pro-inflammatory and anti-inflammatory cytokines, chemokines and growth factors, with the exception of IL-13 and PDGF-AA, on which LPS had a slight effect.
Muramyl peptide increased all levels of the substances studied except for IL-13. Interestingly, LPS, MP, and bacteriocin nisin lowered the level of IL-13 by more than three orders of magnitude. IL-13 plays a critical role in the regulation of allergic reactions by participating in B cell maturation and IgE production. On the other hand, IL-13 can suppress macrophage activity, reducing inflammation and tissue damage.
Nisin showed the least pronounced activity in increasing the substances studied, PDGF-AA was decreased by half compared to the unstimulated sample. Platelet-derived growth factor (PDGF)-AA, -AB, and -BB has multiple functions including the ability to stimulate cell growth and proliferation. (PDGF)-AA, -AB, and -BB play a key role in angiogenesis and blood vessel formation, induce and differential chemotaxis of early-passage rat lung fibroblasts in vitro [53].
In the study, LPS and MP increased the production of IL-10 by 42 and 22 times, respectively, while nisin also increased its level, but to a much lesser extent; the increase was three times compared to the control value. Our results are consistent with the data of other researchers who noted an increase in IL-10 under the influence of nisin in experimental animal models [54, 55]. IL-10 is an anti-inflammatory cytokine that regulates the balance of the immune response in maintaining immune homeostasis. IL-10 reduces the expression of Th1, Th17 cytokines, and together with MHC class II antigens and costimulatory molecules on macrophages, may also suppress the activity of
Fig.1. The influence of LPS, MP, and bacteriocin nisin on the production of cytokines, chemokines, and growth factors; 1 — samples with nisin; 2 — samples with lipopolysaccharide; 3 — samples with muramylpeptide; 4 — control samples
macrophages and dendritic cells, maintaining immune homeostasis. The experimentally discovered ability of BOBs to significantly increase the production of IL-10 is an important confirmation of the regulatory role of BOBs on all populations of immunocompetent cells.
The influence of LPS, MP, and bacteriocin nisin on the surface markers of DCs
A study was conducted on the influence of MP, as well as LPS, adrenaline, and noradrenaline in
an ex vivo system. For this, whole blood samples from volunteers were incubated for with MP, LPS and bacteriocin nisin. The studies have established that the ex vivo introduction of MP and LPS into the peripheral blood of healthy donors does not affect the gene expression of the chemokine receptor CCR7, while LPS, MP contributed to an increase in the number of CD11c+ DCs (Fig. 2-5).
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It is important to note that the membrane protein CD11c is the alpha subunit of integrin aXp2, as well as the complement receptor 4 (CR4) and integrin CD11c/CD18 interacts with various ligands, including iC3b of the complement system, fibrinogen, with intercellular adhesion molecules (ICAM) or LPS, and ensures the participation of DCs in the remodeling of the extracellular matrix, phagocytosis, migration, and cell adhesion [56]. Furthermore, DCs deprived of CD11c are unable to respond to chemokines induced by inflammatory stimuli, such as MCP, MIP1, MIP3 [57]. According to the study results, MP and LPS increased the number of CD11c+ DCs by 29 %, 31 %, respectively, whereas bacteriocin nisin did not have a statistically significant effect on the studied DC markers (Table).
Change in CD11c expression under the influence of LPS, MP, and nisin, Me (Q0, 25-Q0, 75)
Control MP LPS Nisin
100 % * (91-107) 129 % * (119-139) 131 % * (119-142) 105 % (95-116)
Note: * — significance of differences compared to control values, p < 0.05.
It is known that bacterial bioregulators through interaction with epithelial cells, antigen-presenting cells (such as dendritic cells (DCs)), and through the production of signaling metabolites can induce the production of not only pro-inflammatory but also antiinflammatory cytokines. For example, exopolysaccharides from Bifidobacterium breve promote immune tolerance, reducing the production of proinflammatory cytokines and preventing the response of B-cells [58]. Early exposure of the immune system to certain bacterial agents may promote tolerance to allergens, preventing allergic diseases [3, 52]. MPs from Gram-positive bacteria can shift the Th1/Th2 balance, providing a therapeutic effect in allergopathologies and have prophylactic effect in prevention of seasonal diseases [59-62]. At the same time, bacterial bioregulators can affect the integrity and function of epithelial barriers, such as the intestinal and respiratory
barriers. Disruptions of these barriers can in-crease the likelihood of developing allergic reactions [37]. Some bioregulators have the ability to modulate immune responses, for example, by exerting an adjuvant effect [63], or by enhancing regulatory T cells, which can suppress allergic reactions by enhancing regulatory T-cells, suppressing allergic reactions. In particular, the short-chain fatty acid (SCFA) butyrate, produced by commensal microorganisms during starch fermentation, promotes the extrathymic generation of regulatory T-cells (Treg cells) [64, 65].
Some bacteria may promote the production of antiinflammatory cytokines such as IL-10, which may be useful in the context of autoimmune diseases [66, 67]. Bacterial origin bioregulators can help maintain peripheral tolerance in preventing the development of allergic and auto-immune reactions against one's own tissues, including by changing the phenotype of DCs, the mature variants of which are involved in ensuring tolerance [68].
The treatment approach often requires long-term monitoring and adjustments based on patient response. Research in the field of allergic and autoimmune diseases continues, aimed at better understanding the etiology and mechanisms of diseases. This makes it possible to develop new therapeutic approaches and improve existing treatments. For example, in the field of autoimmune diseases, new biologics and cell therapies are being explored that may offer more precise and less toxic treatments. This large-scale study highlights the increasing incidence of these diseases and their impact on public health. These studies highlight the importance of global efforts to improve the understanding, diagnosis, treatment and prevention of autoimmune diseases, highlighting their growing importance as a public health problem. Allergic and autoimmune diseases require a comprehensive approach to management and treatment using modern systems biomedicine approaches [69, 70].
Conclusion
Bacterial origin bioregulators — LPS, GMDP, and nisin modulate the response of immune cells, influencing the production of cytokines, chemokines, growth
factors, and adhesion. The ability of BOBs to reduce the secretion of IL-13 by mononuclear cells by thousands of times and increase IL-10 by tens of times indicates the significant potential of these compounds in maintaining immune homeostasis and in the prevention and treatment of allergic and autoimmune diseases. Bacterial origin bioregulators trigger a negative feedback mechanism by inducing the synthesis of anti-inflammatory factors, that can prevent the inflammatory process.
Cytometric studies of the effect of BOBs on DC differentiation markers showed that not all bacterial origin bioregulators can change the phenotype of DCs: LPS and GMDP increase the expression of CD11c on DCs, while the bacteriocin nisin does not affect the increase in CD11c+ of DCs involved in homing and ensuring tolerance in allergic and autoimmune pathologies.
Thus, bacterial cell wall fragments, realizing their activity through innate immunity receptors, to a much greater extent than nisin, induce the production of cytokines, chemokines, and growth factors. The increase in CD11c expression on dendritic cells under the influence of MP and LPS shows their participation in ensuring the remodeling of the extracellular matrix, phagocytosis, migration, and cell adhesion of DCs. In the conducted ex vivo experiments, no influence of LPS, MP, and nisin was found on the appearance of differentiation markers CCR7.
Understanding the molecular mechanisms of the influence of bioregulators of bacterial origin on the human body opens up new approaches to the regulation of immune homeostasis, the development of preventive and personalized therapy strategies.
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Механизмы регуляции аллергических и аутоиммунных реакций биорегуляторами бактериального происхождения
С.В. Гурьянова1' 2 Щ И.А. Сигматулин3 О.О. Гигани2 С.А. Липкина3
1 Институт биоорганической химии им. академиков М.М. Шемякина и Ю.А. Овчинникова Российской академии наук,
г. Москва, Российская Федерация
2 Российский университет дружбы народов, Медицинский институт, г. Москва, Российская Федерация
3 Московский государственный университет им. М.В. Ломоносова, г. Москва, Российская Федерация
Аннотация. Актуальность. Рост аллергических и аутоиммунных заболеваний, наблюдающийся в последние десятилетия, актуализирует задачу терапии и профилактики их возникновения, что требует детальных исследований механизмов их появления. На возникновение и прогрессирование аллергических и аутоиммунных заболеваний влияют генетическая предрасположенность, образ жизни, факторы окружающей среды, нарушения согласованной работы иммунной системы и, как следствие, иммунного гомеостаза. Лечение этих заболеваний преимущественно симптоматическое и часто сопровождается нежелательными побочными эффектами. Нарушения иммунной системы при различных патологиях имеют свои особенности для каждого вида заболевания и в то же время имеют общие механизмы. Учитывая наличие в организме человека большого количества различных микроорганизмов, учет их влияния имеет первостепенное значение. Микроорганизмы являются источником биологически активных молекул, действие которых может как предотвратить и уменьшить тяжесть заболевания, так и усугубить его. Целью настоящего исследования был анализ цитокинового профиля действия фрагментов клеточных стенок грамотрицательных и грамположительных бактерий — липополисахарида (ЛПС) и мурамилпептида (МП), а также низина — антимикробного пептида бактериальной природы. происхождения на мононуклеарных клетках человека. Материалы и методы. Мононуклеарные клетки получали из периферической крови здоровых добровольцев с использованием среды для разделения клеток Lympholyte CL 5015 и культивировали в присутствии ЛПС, ГМДП и бактериоцина низина. Цитокиновую активность ЛПС, ГМДП и бактериоциннизина исследовали с помощью мультиплексного цитокинового анализа; анализ поверхностных маркеров определяли проточной цитометрией. Результаты и обсуждение. Показано, что фрагменты клеточной стенки бактерий в значительно большей степени, чем низин, индуцируют продукцию цитокинов, хемокинов и факторов роста. Установлено, что ЛПС и МП повышают экспрессию CD11c на дендритных клетках, тогда как бактериоцин низин не влияет на увеличение CD11c+ ДК. ЛПС и МП в проведенных исследованиях ex vivo не влияли на появление CCR7. Выводы. Биорегуляторы бактериального происхождения запускают механизм отрицательной обратной связи, индуцируя синтез противовоспалительных факторов, способных предотвратить воспалительный процесс. Понимание молекулярных механизмов влияния биорегуляторов бактериального происхождения на организм человека открывает новые подходы в профилактике и разработке стратегий персонализированной терапии.
Ключевые слова: врожденный иммунитет, иммунный гомеостаз, аллергия, аутоиммунитет, толерантность, ЛПС, липополисахарид, глюкозаминилмурамилдипептид, мурамилпептид, низин, регуляция воспаления, биорегуляторы бактериального происхождения
Информация о финансировании. Работа выполнена при поддержке Программы стратегического академического лидерства РУДН.
Вклад авторов: С.В. Гурьянова — разработка дизайна исследования; С.В. Гурьянова, И.А. Сигматулин, О.О. Гигани, С.А. Липкина — исследования методами иммуноферментного анализа и цитометрические исследования; С.В. Гу-
рьянова, И.А. Сигматулин, О.О. Гигани, С.А. Липкина — подготовка рукописи. Все авторы прочитали и согласились с окончательной версией рукописи.
Информация о конфликте интересов. Авторы заявляют об отсутствии конфликта интересов. Благодарности — неприменимо.
Этическое утверждение. Протокол исследования одобрен Этическим комитетом РУДН.
Информированное согласие на публикацию. От всех участников исследования было получено добровольное письменное информированное согласие на участие в исследовании, обработку персональных данных и публикацию данной статьи.
Поступила 04.09.2023. Принята 03.10.2023.
Для цитирования: Guryanova S.V., Sigmatulin I.A., Gigani O.O., Lipkina S.A. Mechanisms of regulation allergic and autoimmune reactions by bacterial origin bioregulators // Вестник Российского университета дружбы народов. Серия: Медицина. 2023. Т. 27. № 4. С. 470-482. doi: 10.22363/2313-0245-2023-27-4-470-482
Corresponding author: Svetlana V. Guryanova — PhD, Associate Professor, Department of Biology and General Genetics,
Institute of Medicine, RUDN University, 117198, Miklukho-Maklaya str., 6, Moscow, Russian Federation, 177997, ul. Miklukho-
Maklaya, 16/10, Moscow, Russian Federation. E-mail: [email protected]
Guryanova S.V. ORCID 0000-0001-6186-2462
Gigani O.O. ORCID 0000-0002-7720-0727
Sigmatulin I.A. ORCID 0009-0008-2254-6932
Ответственный за переписку: Гурьянова Светлана Владимировна — кандидат биологических наук, доцент кафедры биологии и общей генетики медицинского института РУДН, 117997, Москва, ул. Миклухо-Маклая 16/10. E-mail: svgur@ mail.ru
Гурьянова С.В. SPIN 6722-8695; ORCID 0000-0001-6186-2462 Гигани О.О. SPIN 6541-3241; ORCID 0000-0002-7720-0727 Сигматулин И.А. ORCID 0009-0008-2254-6932
