目的研究1,25(OH)2D3、VitD受体(VDR)和24-羟化酶(CYP24A1)在过敏性紫癜(HSP)患儿外周血中的表达,探讨1,25(0H)2D3及其相关分子在HSP发病机制中的作用。方法1.空腹采集35例HSP患儿和14例健康儿童外周血,离心分离血浆,采用ELISA法检测血浆中1,25(OH)2D3水平。2.分离2组儿童外周血单个核细胞,抽提总RNA并反转录成cDNA,采用实时荧光定量聚合酶链反应(Real—timePCR)方法检测VDR和CYP24AI的表达。结果1.HSP患儿血浆1,25(OH)2D3水平为(13.29±10.12)μg/L,低于健康对照组[(29.51±23.06)μg/L](P〈0.01)。2.HSP患儿外周血VDRmRNA表达增高,但CYP24A1mRNA表达低于健康对照组(P〈0.05)。结论HSP患儿活性VitD合成及对VDR的应答异常,可能参与HSP的发病。
Objective To study the expressions of 1,25 (OH)2D3 ,vitamin D receptor (VDR) and 24-hydrox- ylase (CYP24AI) aml investigate the efteets of 1,25 (OH)2D3 and its related molecules in the pathogenesis of He- noeh-Schtinlein puq)ura (HSP). Methods 1. The levels in the plasma 1,25 (OH)2D3 of 35 HSP patients and 14 healthy children were detected by enzyme-linked immunosorbent assay(ELISA). 2. Total RNA of peripheral blood were extracted and transcribed into eDNA. Sybr green dye based real-time quantitative PCR method was used to compare the expression levels ( indicated as 2 -ac, value) of VDR and CYP24AI in patients with HSP and those in the controls. Re- sults The level of I, 25 ( OH ) 2 D3 was ( 13.29 ± 10. 12 ) μg/L in plasma of HSP patients, lower than that of the healthy control group[ (29.51 ± 23.06) μg/L] (P 〈 0.01 ). Compared with healthy control group, the level of VDR mRNA was higher but CYP24A1 mRNA was lower in HSP patients(P 〈 0.05). Conclusion The patients with HSP have lower ability to synthesize active form of vitamin D and respond to VDR-mediated vitamin D effects, enhancing the ability to degrade this hormone.