The allergic diseases which are always affected respiratory, degestive, skin systems or mutiple organs in children are very popular. The critical condition in children with allergic diseases always include pediatric allergic shock, serious asthma, serious Henoch-Schonlein purpura, serious Steven Johnson sydrome caused by drug allergy, et al. The following is the review about the critical condition and treatment in children with allergic diseases.

Pediatric allergy,immunology and rheumatology (PAIR) discipline is one of the important branch of pediatrics in China.It covers the pediatric allergic diseases,immunodeficiency diseases,rheumatic diseases and the clinical and research aspect which is associated with infection and immunity including inflammation,and inflammatory diseases,et al.Though it is an interdisciplinary discipline which has a long history and being paid great attention and construction rapidly in early a decade,but it is still in the early stages of development in China.How to promote its reasonable,scientific,and further development quickly to adapt to the high-speed social medical service growth of demand in this field is an important task which we have to face to.This article reviews the discipline development history,present situation and futue trend.

With the improvement of the therapy and the drugs we known more results in a therapeutic ambitious goals of juvenile idiopathic arthritis.Selection of individualized sequential therapy is beneficial to the recovery of the disease.

The current management for juvenile dermatomyositis includes the initial use of corticosteroids followed by various conventional second-line treatments such as methotrexate and azathioprine.Intravenous immunoglobulin is a reasonable short-term treatment with proven benefit.Cyclosporine or tacrolimus have shown efficacy in juvenile dermatomyositis including those patients with interstitial lung disease,whereas mycophenolate mofetil is effective in both polymyositis and refractory dermatomyositis.The curative effect of biological agents needs to be further studied.

Juvenile idiopathic arthritis (JIA) is the most common chronic arthropathy in childhood. Immune and genetic factors take part in the development of JIA and influence its consequence. Studies have identified association between JIA and genes encoding the human leukocyte antigens (HLA) . In this article we discuss the principles behind genetic studies of complex traits like JIA, and comprehensively catalog HLA candidate gene associated with JIA to date, and review several validated associations. Studies indicate that the HLA-Ⅰ, Ⅱ gene and their products play an important role in JIA pathogenesis, clinical course, hormonal effect and prognostic judgment. Studies in different ethnic groups indicate the main relationship between JIA and HLA is concentrated upon A, DR and DQ loci, especially the HLA-Ⅱ gene and some haplotypes. The different type of JIA is always with different HLA susceptible locus and protective locus. Different race, different region and different social environment also affect the JIA's susceptible gene polymorphism. Finally we discuss the problems existed in the study of JIA susceptibility and HLA polymorphism.

Objective To investigate the Th17 cell expression in peripheral blood of childron with systemic lupus erythematosus (SLE) and explore the role of Th17 cells and the cytokines in the pathogenesis of SLE. Methods Twenty-five children with SLE were enrolled and 15 healthy children were controls. Flow cytometry (FCM) was employed to detect the expression of Th17 cells in peripheral blood of SLE children (SLE group, n=25), and IL-17, IL-21 levels in plasma were detected by ELISA. Two-independent sample t-test and Spearmen's test were used for correlation analysis. Results Compared with that of the control, the frequencies of CD3+CD8-IL-17+T[(1.24±0.64)% vs (0.59±0.21)%], CD3+CD8-IL-21+T cells[(1.5±0.6)%vs (0.8±0.4)% ] increased significantly in SLE patients (P＜0.01) and the plasma concentrations of IL-17, IL-21 were significantly higher (P＜0.01). The SLE activity was positively correlated with the frequencies of CD3+CD8-IL-17+T cells, but not with CD3+CD8-IL-21+T cells. Conclusion Th17 cells and the related cytokinesplay an important role in the pathogenesis of childhood SLE.

Objective To investigate the clinical characteristics of 34 systemic onset juvenile idiopathic arthritis (SoJIA) complicated with macrophage activation syndrome (MAS) and analyzed the gene PRF1,UNC13D,STX11,STXBP2 to figure out the genetic pathogenesis mechanism.Methods The clinical characteristics of 34 SoJIA complicated with MAS were analyzed retrospectively and coding sequences of PRF1,UNC13D,STX11 were amplified and tested.The Chi-square test was applied to compare the distribution of alleles and genotypes frequencies between SLE patients and healthy controls.Statistical significance was defined as P value ＜0.05.Results A total number of 34 SoJIA complicated with MAS were included.Boys accounted for 69％(23/34),and the median age was 6 years.85％(29/34) cases had genetic tests and four SNPS loci were detected:PRF1 c.1061 C＞T (rs885822); UNC13D c.659 C＞T (rs3744007); STXBP2 c.1483 T＞cC (rs10001) and STXBP2 c.1616 A＞G (rs6791).Compared with the control group,genotype and allele frequency of PRF1 rs885822 and STXBP2 rs10001 in MAS cases were statistical significantly different (rs885822:allele frequency x2=4.52,P=0.03 ; genotype frequency:x2=5.52,P=0.02.rs10001:allele frequencyx2=21.33,P=0.00; genotype frequency:x2=19.58,P=0.00).There was no statistical significant difference in genotype frequency and allele frequency of UNC13D rs3744007 and STXBP2 rs6791 between the MAS and control group (rs3744007:allele frequencyx2=1.89,P=0.17; genotype frequency:x2=1.59,P=0.45.rs6791:allele frequency x2=l.69,P=0.19; genotype frequency:x2=2.09,P=0.35).Persistent fever,progressive hepatos-plenomegaly,a sharp decline in blood cells counts,pleural effusion,markedly increased serum liver enzymes,hyperlipidemia were the main characteristics.Some children had mucosal bleeding,neurological dysfunction.More than 82％ children had upper respiratory tract infection before the occurrence of MAS.90％ of children were in remission,while three children had multiple organ failure and died.Conclusion MAS is a fatal complication caused by immune disturbance.Early detection and tre-atment is the key to improve the prognosis.The SNP PRF1 rs885822 and STXBP2 rs1001 may be concurrent with the pathogenesis of SoJIA-MAS.The SNP UNC13D rs3744007 and STXBP2 rs6791 may not participate in the pathogenesis of SoJIA-MAS.

[Objective]To test the biomechanical effects of calcium phosphate cement in fixating distal tadius fractures,and to provid biomechanical foundation for clinical treating distal tadius fractures.[Method]A models of 18 human distal radius fracture of adult upper limbs specimen were made and randomly divided into three groups:fixed with Kirschner wire(Kirschner group),CPC(CPC group),and CPC combined with Kirschner wire(combination group).Wrist joint was vertically loaded with 98 N,and palmar flexion with dorsal extention motion was dimulated,which range of movement was from palmar flexion 5?to dorsal extention 30? and frequency was 2000 cycles.Displace data of distal radius were measured by sliding caliper at every 500 cycles,we had tested Young' s modulus of two samples of CPC.[Result]Multiple factor variance analysis was used,Kirschner group and others had significantly statistical difference(P0.05).[Conclusion]CPC can provide enough fixation strength for distal radius fracture with bone defect and Young' s modulus of CPC is about 30 MPa,which is between those of cancellous bone and compact bone.

Objective To explore the expression of miR-21 and miR-19a in juvenile idiopathic arthritis (JIA) and the relationship among the key target genes (SOCS3,STAT3) in JAK/STAT pathways.Methods The venous blood from 33 cases of active JIA in Guangzhou Women and Children Medical Center were collected.All cases were divided into two groups:the systemic group (n=20),polyarthritis group (n=13).Twenty subjects were used as the normal control group.Peripheral blood mononuclear cells (PBMCs) were extracted and separated with Ficoll.miRNA was extracted and purified and real-time quantitative polymerase chain reaction (RT-PCR) was used to obtain cDNA.Target genes of miRNA were detected through Targetscan and RNA22.U6 was used for reference of miR-19a,miR-21 and β-actin were used for STAT3,SOCS3,IL-6,TNF-α mRNA.All the expression were detected by fluorescence quantitative PCR among the groups and calculated the result in standardized 2-ΔΔCT value,non-parametric test was used to test the differences.Results The expression of miR-21 were significantly reduced in the case group than the control group (Z=2.11,P=0.036),in which miR-21 was 7(7-8.5) times reduced than the SJIA group,6.49 (6-7) times than the pJIA group,the difference was statistically significant (Z=2.615,P=0.014 9;Z=2.654,P=0.0291).But no significant difference of miR-21 expression could be found between the SJIA and PJIA groups (Z=0.221,P =0.827 1).The expression of miR-19a was significantly reduced in the case group than the control group (Z=2.41,P=0.014),in which miR-19a was 11.3 (10-12.1) times to the SJIA group,12.2 (12-13.5) times to the pJIA group,the difference was statistically significant (Z=2.334,P=0.015 7;Z=2.414,P=0.026 6).But no significant difference could be detected in the miR-21 expression between the SJIA and the PJIA groups (Z=0.538,P=0.596).Software estimated that STAT3,SOCS3,TNF-α were the target genes of miR-21 and miR-19a in the JAK/STAT pathways respectively.Fluorescence quantitative PCR had shown that mRNA expression of STAT3 [6.24(2.81,7.54) and 3.97(1.81,5.75),P=0.001,0.008],TNF-α [3.03(2.07,3.80) and 3.42(2.46,4.68),P=0.002,0.001],IL-6[4.75(3.59,6.32) and 3.52(2.31,7.51),P=0.006,0.036],SOCS3[2.54(1.77,4.00) and 3.57(1.95,3.83),P=0.003,0.001] was higher in the case Group (SJIA group,the PJIA group) than the control group;STAT3 mRNA expression was negatively correlated with the miR-21 (r=-0.585 4,P=0.006 7;r=-0.613 4,P=0.044 7) and there was statistically significant difference.TNF-α,SOCS3 mRNA expression in the case group (SJIA group,PJIA group) was negatively correlated with the miR-19a.TNF-α (r=-0.664 2,P=0.001 4),SOCS3 (r=-0.790 3,P=0.000 1) of the SJIA group,was higher than those of the PJIA group TNF-α (r=-0.626 1,P=0.039 3),SOCS3 (r=-0.8824,P=0.003),the difference was significant.Conclusion The expression of miR-21,miR-19a in PBMC in the JIA patients are lower than the control group.The high expression of the target genes,miR-21,miR-19a of STAT3,SOCS3,TNF-α suggest that these genes might associate with,activating of JAK/STAT pathway.

Objective Through the application of recombinant human Ⅱ tumor necrosis factor-Fc function protein (rhTNFR:Fc) in the treatment of juvenile idiopathic arthritis (JIA) with randomized control study,clinical characteristic and clinical effect were summarized.Methods According to the randomized controlled principle,124 patients with JIA were divided into control group and treatment group.The basic treatment in two groups were one antirheumatic slow-acting drug,nonsteroidal drug,adrenal cortical hormone.There were no significant differences between clinical type and basic treatment in two groups (P ＞ 0.05).Sixty-two patients of JIA treated with rhTNFR:Fc by subcutaneous injection.The doses was 0.8mg /kg per week.There were 17 cases of oligoarthritis,15 cases of polyarthritis,30 cases of systemic arthritis in the treatment group and control group respectively.The basic antirheumatic drugs,nonsteroidal anti-inflamatory drugs ( NSAIDs),adrenal cortex hormone were allowed to continued.Clinical evaluation index included ACR Pedi 30,ACR Pedi 50 and ACR Pedi 70.The adverse drug reactions were recorded.Results The remission rate of ACR Pedi 30,50,70 in 2 weeks,one month,three monthes and six monthes were different in types of JIA patients in the treatment group ( P ＜ 0.05 ).The remission rate of systemic arthritis was lower than the other two groups of arthritis ( P ＜ 0.05 ).Only 44％ ACR Pedi 50 remission was achieved after three monthes medication in systemic arthritis and 41.7％ ACR Pedi 50,29.2％ ACR Pedi 70 were achieved after six monthes.The remission rate in the types of oligoarthritis and polyarthritis at different time points (2 weeks,one month,three monthes,six monthes) of ACR Pedi 30,50,70 were similar.After six monthes,more than 80％ reached ACR Pedi 50 remission,more than half of patients reached ACR Pedi 70 remission.Three cases of macrophage activation syndrome in systemic arthritis group was effective treated with rhTNFR:Fc.In the treatment group,2 cases of systemic arthritis appeared ache and discomfort after one week treatment,3 cases appeared repeated mild upper respiratory tract infection and diarrhea during treatment,including one varicella infection.The incidence of adverse reactions in the treatment group of systemic arthritis were 16.7％,Other 2 types of patients did not show adverse reaction during rhTNFR:Fc treatment.Conclusion rhTNFR:Fc has good effect on oligoarthritis and polyarthritis of JIA.The adverse reactions of six monthes were rare.The cases of systemic arthritis could reach some clinical remission,but need to guard against infection and the occurrence of adverse reactions.To whom did not respond to conventional therapy in systemic arthritis or systemic arthritis combined with macrophage activation syndrome,it could be considered with rhTNFR:Fc.