间质性膀胱炎发生前后膀胱组织组胺受体变化的动物实验研究

目的 探讨大鼠间质性膀胱炎发生前后膀胱组织中4种组胺受体(H1R、H2R、H3R和H4R)表达的变化. 方法体质量250～300 g的雌性SD大鼠30只,随机分为实验组(20只)和对照组(10只).实验组采用硫酸鱼精蛋白加氯化钾经尿道膀胱灌注建立间质性膀胱炎动物模型,2个月后处死,对照组直接处死.切取2组大鼠膀胱组织后行免疫组化染色,利用IPP 4.5图像分析软件计算各组组胺受体平均吸光度(-A)值,并进行统计学比较. 结果4种组胺受体主要表达于膀胱黏膜层,实验组H1R的(-A)值为0.054±0.031、H2R为0.032±0.021、H3R为0.047±0.033、H4R为0.149±0.191,对照组分别为0.017±0.011、0.018±0.015、0.014±0.011、0.060±0.039.实验组H1R、H2R和H3R的(-A)值明显高于对照组(P＜0.05),H4R的(-A) 值与对照组比较差异无统计学意义(P＞0.05). 结论H1R、H2R和H3R在间质性膀胱炎大鼠膀胱黏膜中表达显著升高,可能与间质性膀胱炎的发生相关,H3R可能是治疗间质性膀胱炎的新靶点.

Changes of histamine receptors in bladder before and after the establishment of interstitial cystitis in animal model

Objective To investigate the changes of 4 histamine receptors (H1R, H2R, H2R and H4 R)in interstitial cystitis on animal experimental models. Methods Thirty female SD rats (250-300 g) were randomly divided into 2 groups as follows: 20 in experimental group and 10 in control group. The experimental group was filled with protamine sulfate+ potassium chloride to create interstitial cystitis model, the control group was sacrificed directly. At the end of the experiment, the bladders of all these SD rats were studied by the immunohistochemistry staining and the value of their mean absorbance (-A) was calculated by IPP4.5 image analysis software. The SPSS 11.5 was used to analyze the differences between the groups. Results Four kinds of histamine receptors mainly expressed in the bladder epithelium. In the experimental group, the (-A) of H1 R was 0. 054±0.031, the of H2R was 0.032±0.021, the (-A) of H3R was 0.047±0.033 and the (-A) of H4R was 0. 149±0. 191,respectively. In the control group, the A of H1R was 0. 017±0. 011, the (-A) of H2R was 0. 018±0. 015, the (-A) of H3R was 0. 014±0. 011, the (-A) of H4R was 0. 060±0.039, respectively. In contrast,the A of H1 R, H2 R and H3R in experimental group was increased significantly(P＜0.05); there was no significant change in (-A) of H4R expression(P＞0.05). Conclusions H1, H2 and H3 receptors in rat model interstitial cystitis bladder epithelium have increased and it indicates H1 R, H2R and H3R may be related to interstitial cystitis. H3 R may be a new treatment target of interstitial cystitis.