自发性高血压大鼠阴茎组织结构和勃起功能的改变

目的:探讨自发性高血压大鼠(SHR)勃起功能的改变及其发病机制。方法:20周龄雄性SHR大鼠及同系WKY大鼠各15只,夹尾法测量大鼠收缩压(SBP),皮下注射阿朴吗啡(APO)检测阴茎勃起功能,免疫组化染色观察阴茎海绵体α-平滑肌肌动蛋白(α-SMA)及Ⅲ型胶原(COLⅢ)的表达。结果:SHR组及WKY组收缩压分别为(205.7±11.9)、(114.3±10.2)mmHg(1 mmHg=0.133 kPa),阴茎勃起次数分别为(0.6±0.5)、(2.4±0.6)次,差异均有极显著性(P<0.01)。SHR大鼠阴茎海绵体组织平滑肌及COLⅢ的表达显著高于WKY大鼠(P<0.01)。结论:高血压严重影响大鼠阴茎勃起功能,海绵体组织结构的病理改变可能是自发性高血压大鼠勃起功能下降的机制之一。

Changes of Morphology and Erectile Function of the Cavernous Tissues in Spontaneously Hypertensive Rats

OBJECTIVE: To study the changes of morphology and erectile function of the cavernous tissues in spontaneously hypertensive rats. METHODS: Spontaneously hypertensive male rats (SHR) (n = 15) and normotensive Wistar-Kyoto rats (WKY) (n = 15) were studied for 20 weeks. Systolic blood pressure (SBP) was measured weekly by the tail/cuff method. Erectile function was tested by injecting apomorphine (APO). The expression alpha-smooth muscle actin (alpha-SMA) and collagen III was examined by immunohistochemistry. RESULTS: SHR showed a higher systolic blood pressure (205.7 +/- 11.9 vs 114.3 +/- 10.2 mm Hg) and a lower erection frequency (0.6 +/- 0.5 vs 2.4 +/- 0.6). The expression of alpha-smooth muscle actin and collagen III in the cavernous tissues in the SHR was significantly higher than in the WKY. CONCLUSION: The erectile function of the penis is markedly affected by hypertension, and the pathological changes may be one of the most important mechanisms of decreased erectile function in SHR.