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Immunoglobulin A (IgA) vasculitis is the most common leukocytoclastic small-vessel vasculitis in children and mainly involves the small vessels in the skin, joints, digestive tract, and kidneys. Its pathogenesis is still unclear. Currently, it is believed that environmental factors can cause autoimmune dysfunction and lead to the deposition of IgA-containing immune complexes on the wall of arterioles on the basis of genetic factors. This article reviews the research advances in the role of immune factors in the pathogenesis of IgA vasculitis.
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Humans , Autoantibodies , Complement System Proteins , Physiology , Cytokines , Physiology , Glycosylation , Immunoglobulin A , Immunoglobulin E , Metabolism , Vasculitis , Allergy and ImmunologyABSTRACT
<p><b>OBJECTIVE</b>The pathogenesis of mesangial proliferative glomerulonephritis (MsPGN) and mechanisms of glucocorticoid (GC) resistance have not been fully identified. Cytotoxic T-lymphocyte antigen-4 (CTLA-4) is an important inhibitor of T-lymphocyte activation. The objective of the study is to investigate the CTLA-4 expression and apoptosis in lymphocytes of children with MsPGN and the effects of dexamethasone (Dex) on the CTLA-4 expression and apoptosis.</p><p><b>METHODS</b>Blood samples were collected from 36 children with MsPGN and 30 healthy children. CTLA-4 expression in in vitro cultured lymphocytes with or without Dex treatment was measured by flow cytometry following direct immune fluorescene. The rate of apoptosis in the lymphocytes was evaluated by annexin V-FITC and propidium iodide staining.</p><p><b>RESULTS</b>The CTLA-4 expression and apoptosis in lymphocytes from children with MsPGN were significantly lower than those in the healthy control children in the absence or presence of Dex treatment (p<0.05). There was a positive correlation between CTLA-4 expression and apoptosis in lymphocytes (p<0.05).</p><p><b>CONCLUSIONS</b>Abnormal CTLA-4 expression may participate in the pathogenesis of MsPGN and be one of mechanisms of GC resistance.</p>
Subject(s)
Child , Female , Humans , Male , Antigens, CD , Blood , Apoptosis , CTLA-4 Antigen , Dexamethasone , Pharmacology , Glomerulonephritis, Membranoproliferative , Drug Therapy , Lymphocytes , Allergy and ImmunologyABSTRACT
To further explore the result of bilingual teaching in pediatrics,we randomly chose 200 undergraduates of 4 class and released students'questionnaires about bilingual teaching with teaching content before and after class to assess students'understanding of bilingual teaching and analysed appraisal result.We found no significant difference of student score between students accepting bilingual teaching and not accepting the bilingual teaching,but there was difference for English tests and expression level.So we think that students can fully accept the bilingual teaching of pediatrics under the premise with selecting appropriate teaching methods and means.
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Objective To investigate the correlation between cytotoxic T lymphocyte associated antigen 4 (CTLA - 4 ) and primary nephrotic sysdrome(PNS) with the pathologic type of mesangial proliferative glomerulonephritis(MsPGN) of glucocorticoid(GC) resistance. Methods The polymerase chain reaction - restriction fragment length polymorphism( PCR - RFLP) analysis was used to investigate the genotype of position - 318 promoter of CTLA- 4 gene of 36 patient children and 30 healthy controls. Results The frequences of genotypes at position - 318 promoter of CTLA- 4 gene in patients were 38.9% for CC,61.1 % for TC and 0% for TT. The frequences of alleles at this position were 69.4% for C allele and 30.6% for T allele. The frequences of genotypes and alleles in children were not significantly different from those in controls. Conclusion CTLA-4 promoter ( -318)C/T dimorphism was not associated with PNS- MsPGN of GC resistance, which hinted that the polymorphism may be not inlolved in pathogenensis of PNS-MsPGN and the mechanism of GC resistance.
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Objective To study the expression of membrane glucocorticoid receptors(mGR), the correlation between mGR and glucocorticoid(GC)'s effects on apoptosis and proliferation of peripheral blood lymphocytes(PBLs) in minimal change nephrotic syn-drome(MCNS)and the influence of GC on mGR. Methods MCNS, nonminimal change NS(NMCNS) and healthy children were involved in this study. Indirect immune fluorescence and flow cytometry were used to examine the percentages of positive mGR lymphocytes; the apoptosis of PBLs was measured by propidium iodide(PI) staining and the proliferation of PBLs was investigated by fa -TdR incorporation. Results 1.mGR expression in MCNS was higher than that in NMCNS and healthy control,but it was reduced after clinical GC therapy(P
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Objective To explore the apoptosis and proliferation of peripheral blood lymphocytes(PBLs) from primary nephrotic syndrome(PNS) and effects of dexamethasone(Dex) on them.Methods Minimal change NS(MCNS), non-minimal change NS(NMCNS) and healthy children were involved in this study. PBLs were cultured in vitro with Dex or PHA+Dex or without PHA and Dex. Apoptosis of PBLs was measured by propidium iodide(PI) staining; The effects of Dex at different concentrons on PBLs′proliferation were investigated by 3H-TdR incorporation.Results The apoptotic rate of vacuity group in MCNS was lower compared with NMCNS and healthy controls(P
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Objective To investigate the changes of plasma adrenomedullin(ADM),endothelin-1(ET-1) in infants with severe pneumonia complicated by acute congestive heart failure,and its relationship with heart function.Methods Forty-seven bronchopneumonia patients in their acute phase were divided into three groups:group A1,severe pneumonia complicated by acute congestive heart failure without congenitive heart disease(CHD)(n=15);group B1,severe pneumonia complicated by acute congestive heart failure with CHD(n=12);group C1,mild bronchopneumonia(n=20).A2,B2 and C2 groups were the convalescence groups of A1,B1 and groups C1 respertively.Group D,20 healthy infants were used as control group.Plasma ADM,ET-1 levels of patients in acute phase(pre-treatment)and convalescent phase and controls were measured by specific radioimmunoassary.Results 1.The plasma ADM levels significantly increased in the acute phase of A1,B1 and C1 compared with healthy controls(Pa0.05).3.The plasma ADM,ET-1 levels in A2 and B2 groups significantly decreased compared with those in group A1 and B1(Pa0.05).Conclusions The ADM,ET-1 play very important roles in the pathophysiological processes of pneumonia and congestive heart failure in infants.ET-1 may play an important role in the pathogenesis of severe pneumonia in infants complicated with congestive heart fai-lure.The level of plasma ET-1 is related with the degree of congestive heart failure.
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Objective To explore the activation and apoptosis of peripheral blood lymphocytes(PBLs) in children with Henoch-Schonlein purpura(HSP) and the effects of triptoIide(TP) on them. Methods The changes of activation and apoptosis were observed on cultured PBLs in children with HSP and healthy controls ,and the effects of TP were compared respectively. Expression of CD3, CD25 and apoptosis rate of PBLs were assayed with flow cytometry. Results The percentage of CD3+ CD25+ cell was significantly higher (P
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Objective To study the clinical correlated factors of renal damage in henoch-schonlein purpura (HSP).Methods One hundred cases with HSP were retrospectively studied. Accoding to the urinary route examination, the patients were devided into 2 groups, HSP with (49 cases) and without renal damaged (51 cases). In addition, the group of HSP with renal damaged was further diveded into 2 groups, HSP with urinary abnormality passingly (27 cases) and persistently (22 cases). Clinical indicators were statistical analysed.Results To be compared with HSP without renal damaged, age,apread of the purpura, abdominal pain,hemorrhage of digestive tract were higher in HSP with renal damaged (P