针刺足三里穴对冷应激性溃疡大鼠下丘脑与肾上腺NOS表达的影响

Effect of acupuncture at acupoint ST 36 on the expression of NOS in hypothalamus and adrenal in rats with cold-restrainted stress-induced ulcer

目的研究针刺足三里穴对急性胃溃疡(由冷应激引起)的保护作用,以及冷应激对大鼠下丘脑及肾上腺一氧化氮合成酶(NOS)表达的影响。方法通过计算胃粘膜溃疡指数和应用RT-PCR技术,对大鼠下丘脑、肾上腺NOS的表达情况进行半定量研究。结果实验数据表明,针刺足三里穴可以明显减少溃疡(由冷应激导致)指数;同时发现下丘脑NOS1不参与冷应激溃疡病理过程,针刺足三里穴可在生理范围内上调下丘脑NOS1的表达水平;下丘脑NOS2参与了冷应激溃疡病理过程,针刺足三里穴可下调其表达,减轻病理损害程度;NOS3也参与了冷应激溃疡病理过程,针刺可以下调其表达水平,但下调程度较轻微;肾上腺NOS1及NOS3表达水平在应激过程中增高,针刺只能抑制NOS1表达,肾上腺NOS2不参与该应激过程。结论针刺对冷应激溃疡具有一定的保护作用,该保护作用是通过生理性上调下丘脑NOS1表达、下调NOS2及NOS3病理性高表达以及抑制肾上腺NOS1表达而实现的。

Objective To study the protection effect of acupuncture at acupoint ST 36 in rat with cold-restrainted stress-induced ulcer,and to observe the expression of NOS in hypothalamus and adrenal. Methods Ulcer Index in rats was used to study the protection effect of acupuncture, and and RT-PCR was employed to study the expression of NOS in hypothalamus and adrenal. Images were analyzed with semi-quantitative method. Results The ulcer Index was significantly decreased in rats with stress-induced ulcer by acupuncture as indicated by a comparison with those without acupuncture. The expression of NOS1 in hypothalamus was increased by acupuncture protect stress-induced ulcer. The increased expression of NOS2 was involved in stress-induced ulcer, and acupuncture decreased its expression. The expression of NOS3 in hypothalamus had the similar reaction to NOS2, but the decreased effect of acupuncture was limited. The expression of NOS1 and NOS3 in adrenal were increased by cold stress, only the expression of NOS1 could be repressed with acupuncture. There was no NOS2 expression in adrenal in stress-induced ulcer rats. Conclusion The protection effect in stress-induced ulcer exerted by acupuncture at acupoint ST 36 were mediated by increase of the physiological expression of NOS1 in hypothalamus as well as decrease of the expression of NOS2,NOS3 in hypothalamus and repress of the expression of NOS1 in adsenal.