一氧化氮与利血平致大鼠胃粘膜损伤的关系

目的: 探讨一氧化氮(NO)与利血平致大鼠胃粘膜损伤机制的关系。方法: 从大鼠腹腔内注入利血平复制成胃粘膜损伤模型,并随机分为实验组和对照组。用镉还原加格氏显色法和改良硫代巴比妥酸法分别测定两组大鼠血浆及胃粘膜中NO和丙二醛(MDA)含量,用还原型辅酶Ⅱ组织化学方法结合图像分析对两组大鼠胃壁内一氧化氮合酶(NOS)进行定位、定量研究。结果: 实验组大鼠血浆、胃粘膜中NO含量显著低于对照组(P＜0.01),而其MDA含量则显著高于对照组(P＜0.05,P＜0.01);实验组大鼠胃壁内NOS阳性神经细胞、阳性神经纤维密度及其着色深度均显著低于对照组(P＜0.05,P＜0.01)。结论: 利血平致大鼠胃粘膜损伤的发生可能与大鼠胃壁内NOS阳性神经成分减少,体内NO不足使其对胃粘膜的保护作用减弱有一定关系。

The relationship betweennitric oxide and gastric mucosal injury induced by reserpine in rats

AIM: To study the relationship between nitric oxide (NO) and gastric mucosal injury induced by reserpine in rats. METHODS: Sixteen healthy male Wistar rats were randomly divided into control group and experimental group (n=8). NO contents and malondialdehyde(MDA) contents in plasma, gastric mucosa of the rats were respectively determined with Cadmium-reduct plus Greiss and TBA; nitric oxide synthase in gastric walls of the rats were observed using NADPH-diaphorase histochemistry and quantitatively measured with image analyzer.RESULTS: The NO contents in both plasma and gastric mucosa of experimental group were significantly lower than that in control group (P<0 01),but their MDA contents were both higher than that in control group(P<0 05,P<0 01);the densities and A values of nitric oxide synthase (NOS)-positive nerve-cells and nerve fibers in gastric walls of experimental group were all obviously lower than that in control group (P<0 05,P<0 01). CONCLUSION: The mechanism of the reserpine-induced gastric mucosal injury in rats might be related to NO insufficiency arisen from the inhibition of NOS activity in NANC nerves in gastric wall,which might weaken the protection to gastric mucosa.