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Expression of relaxin in blood and renal tissue of children with Henoch-Schonlein purpura and its significance.

??Abstracts?? Objective To investigate the expression of RLX in blood and renal tissue of patients with HSP?? and its correlation with clinical indexes and pathological changes?? and explore its effect on the pathogenesis of HSP. Methods Collect 39 cases of Henoch-Schonlein purpura ??HSP?? from Department of Nephrology in Children’s Hospital of Jiangxi province from November 2011 to June 2012?? with complete follow-up data. According to the clinical urine manifestation?? 39 patients with HSP were divided into non-kidney damage group ??n=20?? and kidney damage group ??n=19??. All 39 patients were collected blood samples in the acute and convalescent phase. Nineteen patients from kidney damage group were divided into mild lesions ??n=5???? moderate lesions ??n=9??and severe lesions ??n=5???? according to the degree of pathological changes. RLX concentration was detected with enzyme-labeled immunosorbent assay ??ELISA?? method.RLX protein expression in renal tissue was detected with immunohistochemistry method. Results In the acute phase?? the serum level of RLX in HSP was significantly higher than normal control?? and its concentration was significantly higher in kidney damage group than in non-kidney damage group ??P??0.05??. Compared with acute phase?? the serum level of RLX in HSP in the convalescent phase was significantly lower?? and the level of decline was slower in kidney damage group than in non-kidney damage ??P??0.05??. Weak expression of RLX in renal tissue was found in normal control??while the expression of RLX in renal tissue significantly increased in HSPN ??P??0.05???? with the pathological changes of renal tissue aggravating. The expression of RLX in renal tissue in HSPN was significantly correlated with the serum concentration of RLX ??P??0.05?? and the total urine protein for 24 hours ??P??0.05??. Conclusion There is a modest up-regulation in serum and renal RLX protein expression in HSP?? and the severity of the disease is closely related with RLX expression?? which suggests that RLX may be involved in the pathogenesis of HSP/HSPN?? and it may be an important mechanism that upregulation of RLX may play a defensive role in delaying disease progression of HSP/HSPN.