Jue Jiang1, Wuqiong Duan2, Xu Shang1, Hua Wang1, Ya Gao1, Peijun Tian3, Qi Zhou4. 1. Department of Ultrasound, The Second Affiliated Hospital of Xi'an Jiaotong University, 157 Xiwu Road, Xincheng District, Xi'an, Shaanxi, 710004, People's Republic of China. 2. Department of Pediatrics, Ankang Center Hospital, 85 Jinzhou South Road, Hanbin District, Ankang, Shannxi, 72500, People's Republic of China. 3. Department of Pediatrics, Ankang Center Hospital, 85 Jinzhou South Road, Hanbin District, Ankang, Shannxi, 72500, People's Republic of China. peijuntian7250@gmail.com. 4. Department of Ultrasound, The Second Affiliated Hospital of Xi'an Jiaotong University, 157 Xiwu Road, Xincheng District, Xi'an, Shaanxi, 710004, People's Republic of China. qizhou_1942@outlook.com.
Abstract
Henoch-Schönlein purpura (HSP) is the most common form of systemic small-vessel vasculitis in children, and HSP nephritis (HSPN) is a major complication of HSP and is the primary cause of morbidity and mortality. Previous studies have suggested that inducible nitric oxide synthase (iNOS) may play an important role in the pathogenesis of HSP. In this study, we performed a detailed analysis to investigate the potential association between iNOS polymorphisms and the risk of HSP and the tendency for children with HSP to develop HSPN in a Chinese Han population. A promoter pentanucleotide repeat (CCTTT)n and 10 functional single-nucleotide polymorphisms (SNPs) from 532 healthy controls and 513 children with HSP were genotyped using the MassARRAY system and GeneScan. The results suggested that the allelic and genotypic frequencies of the rs3729508 polymorphism were nominally associated with susceptibility to HSP. In addition, there was a significant difference in the allelic distribution of the (CCTTT)12 repeats and rs2297518 between the HSP children with and without nephritis; the HSP children with nephritis exhibited a significantly higher frequency of the (CCTTT)12 repeats and A allele of rs2297518 than the HSP children without nephritis (P FDR = 0.033, OR = 1.624, 95% CI = 1.177-2.241 and P FDR = 0.030, OR = 1.660, 95% CI = 1.187-2.321, respectively). CONCLUSION: Our results support that iNOS polymorphisms are associated with the risk of HSP and may strongly contribute to the genetic basis of individual differences in the progression to nephritis among children with HSP in the Chinese Han population. What is Known: • The etiology of HSP is unknown, but the genetic factors may play an important role in the pathogenesis of HSP. • iNOS could contribute to the development and clinical manifestations of HSP, and this has not been studied extensively so far. What is New: • Our results support that iNOS polymorphisms not only are associated with HSP risk but also strongly contribute to the genetic basis of individual differences in the progression of HSP to nephritis among Chinese Han children.
Henoch-Schönlein purpura (HSP) is the most common form of systemic small-vessel vasculitis in children, and HSP nephritis (HSPN) is a major complication of HSP and is the primary cause of morbidity and mortality. Previous studies have suggested that inducible nitric oxide synthase (iNOS) may play an important role in the pathogenesis of HSP. In this study, we performed a detailed analysis to investigate the potential association between iNOS polymorphisms and the risk of HSP and the tendency for children with HSP to develop HSPN in a Chinese Han population. A promoter pentanucleotide repeat (CCTTT)n and 10 functional single-nucleotide polymorphisms (SNPs) from 532 healthy controls and 513 children with HSP were genotyped using the MassARRAY system and GeneScan. The results suggested that the allelic and genotypic frequencies of the rs3729508 polymorphism were nominally associated with susceptibility to HSP. In addition, there was a significant difference in the allelic distribution of the (CCTTT)12 repeats and rs2297518 between the HSP children with and without nephritis; the HSP children with nephritis exhibited a significantly higher frequency of the (CCTTT)12 repeats and A allele of rs2297518 than the HSP children without nephritis (P FDR = 0.033, OR = 1.624, 95% CI = 1.177-2.241 and P FDR = 0.030, OR = 1.660, 95% CI = 1.187-2.321, respectively). CONCLUSION: Our results support that iNOS polymorphisms are associated with the risk of HSP and may strongly contribute to the genetic basis of individual differences in the progression to nephritis among children with HSP in the Chinese Han population. What is Known: • The etiology of HSP is unknown, but the genetic factors may play an important role in the pathogenesis of HSP. • iNOS could contribute to the development and clinical manifestations of HSP, and this has not been studied extensively so far. What is New: • Our results support that iNOS polymorphisms not only are associated with HSP risk but also strongly contribute to the genetic basis of individual differences in the progression of HSP to nephritis among Chinese Han children.
Entities:
Keywords:
Chinese Han population; Henoch-Schönlein purpura; Henoch-Schönlein purpura nephritis; Inducible nitric oxide synthase; Single nucleotide polymorphisms
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