scholarly journals Significance of Macrophage Subtypes in the Peripheral Blood of Children with Systemic Juvenile Idiopathic Arthritis

Author(s):  
Dan Feng ◽  
Wen-Yan Huang ◽  
Xiao-Ling Niu ◽  
Sheng Hao ◽  
Li-Ning Zhang ◽  
...  
Rheumatology ◽  
2012 ◽  
Vol 51 (10) ◽  
pp. 1881-1886 ◽  
Author(s):  
E. Omoyinmi ◽  
R. Hamaoui ◽  
A. Pesenacker ◽  
K. Nistala ◽  
H. Moncrieffe ◽  
...  

2019 ◽  
Vol 79 (2) ◽  
pp. 225-231 ◽  
Author(s):  
Pui Y Lee ◽  
Grant S Schulert ◽  
Scott W Canna ◽  
Yuelong Huang ◽  
Jacob Sundel ◽  
...  

ObjectiveMacrophage activation syndrome (MAS) is a life-threatening complication of systemic juvenile idiopathic arthritis (sJIA) characterised by a vicious cycle of immune amplification that can culminate in overwhelming inflammation and multiorgan failure. The clinical features of MAS overlap with those of active sJIA, complicating early diagnosis and treatment. We evaluated adenosine deaminase 2 (ADA2), a protein of unknown function released principally by monocytes and macrophages, as a novel biomarker of MAS.MethodsWe established age-based normal ranges of peripheral blood ADA2 activity in 324 healthy children and adults. We compared these ranges with 173 children with inflammatory and immune-mediated diseases, including systemic and non-systemic JIA, Kawasaki disease, paediatric systemic lupus erythematosus and juvenile dermatomyositis.ResultsADA2 elevation beyond the upper limit of normal in children was largely restricted to sJIA with concomitant MAS, a finding confirmed in a validation cohort of sJIA patients with inactive disease, active sJIA without MAS or sJIA with MAS. ADA2 activity strongly correlated with MAS biomarkers including ferritin, interleukin (IL)-18 and the interferon (IFN)-γ-inducible chemokine CXCL9 but displayed minimal association with the inflammatory markers C reactive protein and erythrocyte sedimentation rate. Correspondingly, ADA2 paralleled disease activity based on serial measurements in patients with recurrent MAS episodes. IL-18 and IFN-γ elicited ADA2 production by peripheral blood mononuclear cells, and ADA2 was abundant in MAS haemophagocytes.ConclusionsThese findings collectively identify the utility of plasma ADA2 activity as a biomarker of MAS and lend further support to a pivotal role of macrophage activation in this condition.


Author(s):  
В.Н. Сахаров ◽  
П.Ф. Литвицкий ◽  
Е.И. Алексеева ◽  
Н.А. Маянский ◽  
Р.Ш. Закиров

Цель исследования - изучение перепрограммирования мононуклеарных лейкоцитов на модели системного ювенильного идиопатического артрита (сЮИА), воспроизводимой у крыс Wistar с использованием полного адъюванта Фрейнда и липополисахарида. Методика. сЮИА воспроизведен у 6-месячных крыс-самцов Wistar. На 40-е сут. эксперимента животные были разделены на 3 группы: 1-я группа - контроль; 2-я - группа доксициклина; 3-я - группа дексаметазона. Взятие проб крови у животных проводили на нулевые, 41-е и 55-е сут. Мононуклеарные клетки периферической крови выделяли гравиметрически, после чего окрашивали их на маркеры и внутриклеточные цитокины. Дифференцировали моноциты (CD3-CD4+) и Т-хелперы (CD3+CD4+). Анализировали динамику внутриклеточной экспрессии интерлейкина IL-4 (рассматривали как маркер про-М2 фенотипа, так как в случае выделения из клетки ИЛ-4 служит стимулятором М2 поляризации макрофагов) и IFN-g (как маркер про-М1 фенотипа) по данным проточной цитофлуориметрии. Применяли непараметрический статистический тест Mann-Whitney-Wilcoxon в программе R для статистической обработки данных. Результаты и заключение. При моделировании сЮИА выявлено закономерное изменение фенотипа моноцитов. Применение же доксициклина и дексаметазона приводило к более ранней поляризации их по про-М2-пути в отношении моноцитов (на 41-е сут.) в сравнении с контролем. Про-М1 эффект (на 55-е сут., в сравнении с контролем) выявлен также в группах доксициклина и дексаметазона. У животных разных групп обнаружены характерные динамические изменения внутриклеточной экспрессии цитокинов. Важно, что различная направленность поляризации фенотипа при сЮИА и применении препаратов наблюдается не только у моноцитов, но и у Т-хелперов. The study objective was to evaluate targeted reprogramming of peripheral blood mononuclear cells in systemic juvenile idiopathic arthritis (sJIA) modeled in 6-month-old male Wistar rats by co-administration of complete Freund’s adjuvant and lipopolysaccharide. Methods. On day 40 of the experiment, rats were divided into three groups: control, doxycycline, and dexamethasone groups. Blood samples were collected on days 0, 41, and 55. Peripheral blood mononuclear cells were isolated gravimetrically and stained for markers and cytokines. Monocytes (CD3-CD4+) and T-helpers (CD3+CD4+) were differentiated as target cells. IL-4 was considered a marker for the pro-M2 phenotype since IL-4 can activate M2 macrophage polarization; IFN-g was considered a marker for the pro-M1 phenotype. Time-related changes in the intracellular expression of IL-4 and IFN-g were studied using flow cytometry. Data were analyzed using nonparametric statistical tests (Mann-Whitney-Wilcoxon) in the R environment for statistical computing. Results and conclusions. Monocytes (like macrophages) underwent reprogramming during the development of modeled sJIA disease. In monocytes of doxycycline and dexamethasone treatment groups, pro-M2 effects were observed earlier (day 41) than in the control group. Pro-M1 effects were observed in monocytes of doxycycline and dexamethasone groups on day 55, as compared with the control group. Characteristic time-related changes of intracellular cytokine expression were described for different groups. Importantly, the differently directed phenotype polarization was observed in sJIA and treatment groups for both monocytes and T-helpers.


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