重复制动应激对雌性大鼠卵巢功能的影响

Effect of Repeated Immobilization Stress on Ovarian Function in Female Rats

目的观察重复应激对雌性大鼠卵巢功能的影响,同时观察更年期动物卵巢功能的变化,并对二者进行比较。方法选用性成熟雌性大鼠每天制动应激1次,连续15d,通过阴道涂片观察性周期变化,同时观察血浆雌二醇及孕酮水平的变化。结果重复应激可引起雌性大鼠卵巢功能紊乱或减退,性周期表现为延长或无生理规律或无性周期交替而持续处于间情一期;卵巢分泌雌二醇功能减退,分泌孕酮功能明显紊乱,性周期中各阶段血浆雌二醇水平显著降低和/或生理周期失常或消失,孕酮水平显著升高和生理分泌模式失常,部分动物血浆孕酮水平向更年期动物变化。结论应激可诱导卵巢功能紊乱和退化,此模型适用于防治女性卵巢功能紊乱和退化性疾病的药物药效学研究。

Objective To observe the effects of repeated immobilization on rats ovarian function and to observe the changes of ovarian function in menopause animals.Methods Daily vaginal smears were permfored to follow the estrous cycle in adult female rats.The animals with regular cycle were exposed to the scheduled daily repeated immobilization for 15-day,which included 5 stress episodes with each episode consisting of three immobilizations (one time per day). The duration of immobilization was progressively increased with the subsequent episode. Serum levels of estradiol (E2) and progesterone (P) were measured throughout the estrous cycle before and after the stress.Results The repeated stress resulted in the disruption of the estrous cycle characterized by longer phase of diestrus or by fewer epithelium from vagina in proestrus and estrus.In the stressed rats, a significant decrease of serum E2 and an increase of P were shown throughout the cycle compared to that before stress;the normal secretion cycle was interrupted or even disappeared; changes of serum P level in some rats were similar to the menopause animals.Conclusion Repeated immobilization can cause the disruption or degeneration of ovarian function,indicating that rats with stress-induced ovarian dysfunction is an appropriate animal model for testing protective effects of agents against aging and for the diseases related to ovarian dysfunction.