晚期糖基化终产物及其受体对大鼠阴茎海绵体组织中内皮素-1活性的影响

目的:通过观察大鼠阴茎海绵体组织中晚期糖基化终产物(AGEs)及其受体(RAGE)的变化对内皮素1(ET-1)活性的影响,探讨AGEs在糖尿病性勃起功能障碍(DMED)发生发展中的作用。方法:成年雄性SD大鼠60只,随机取40只用于制作糖尿病模型,造模后共27只大鼠成模,将其分为两组:糖尿病(DM)组15只和糖尿病+氨基胍给药(DM+AG)组12只;另20只大鼠平分为两组:正常对照(NC)组和正常对照+氨基胍给药(NC+AG)组;两组氨基胍(AG)给药组大鼠造模后即在其饮水中按1g/L剂量加入AG。饲养8周后取各组大鼠阴茎海绵体组织,一部分用于免疫组化法观察分析AGEs及其受体的分布和表达,剩余部分匀浆后检测AGE-肽(AGE-P)含量和ET-1活性。结果:DM组阴茎海绵体组织中AGEs和RAGE的表达、AGE-P含量及ET-1活性明显高于正常对照组(P<0.05);正常对照组与NC+AG组间比较在各项指标上则无明显差异(P>0.05)。结论:糖尿病状态下AGEs与RAGE的结合效应可以引起大鼠阴茎海绵体组织中ET-1活性的增强,从而促进DMED的发生发展。

Advanced Glycation End Products and Their Receptors Elevate the Activity of Endothelin-1 in Rat Cavernosum

OBJECTIVE: To investigate the role of advanced glycation end products (AGEs) and their receptors (RAGE) in the pathogenesis of diabetic mellitus erectile dysfunction (DMED) and the effects of AGEs and RAGE on the activity of endothelin-1 (ET-1) in rat cavernosum. METHODS: Forty male Sprague-Dawley rats were taken at random to construct 2 groups of diabetes mellitus (DM) models of equal number, one given free access to water and the other administered aminoguanidine hydrochloride (DM + AG) in water at the dose of 1 g/L. Another 20 male SD rats were equally divided into a normal control and an AG control group. After 8 weeks, the cavernosum tissues were harvested from all groups of rats, part of the isolated penile tissues homogenated to detect the content of AGE-peptide (AGE-P) and the activity of ET-1, and the AGEs and RAGE in the rest of the penile tissues analyzed by immunohisto- chemical assay. RESULTS: Compared with the normal controls, the expressions of AGEs and RAGE, the content of AGE-P and the activity of ET-1 in the cavernosum tissues were significantly high in the DM group (P < 0.05), while the administration of AG to the DM rats reversed the above results. No significant difference was observed between the normal control and AG control groups in any of the data (P > 0.05). CONCLUSION: In DM conditions, the joint effect of AGEs and RAGE may elevate the activity of ET-1 in rat cavernosum and thus promote the development of DMED.