屈洛昔芬对假孕大鼠黄体细胞凋亡和Bax、Bcl-2蛋白表达的影响(英文)

目的:研究屈洛昔芬对假孕大鼠黄体细胞凋亡和Bax、Bcl-2蛋白表达的影响。方法:HE染色观察大鼠卵巢黄体组织学变化,TUNEL法检测黄体中凋亡细胞的存在,免疫组织化学方法观察假孕大鼠卵巢黄体中Bax和Bcl-2蛋白的表达。结果:成年假孕大鼠卵巢黄体自然退化中黄体细胞凋亡出现在假孕第13天,15天时可观察到凋亡细胞的显著增加。Bax和Bcl-2蛋白在黄体细胞中的表达在整个黄体自然退化中无显著改变。20mg·kg~(-1)假孕大鼠第2天口服给予20mg·kg~(-1)屈洛昔芬后,第8天观察时黄体中出现凋亡细胞,且假孕期从(15.5±1.1)天缩短至(12.8±1.6)天。经屈洛昔芬作用后,假孕大鼠黄体中Bax蛋白的表达增加而Bcl-2蛋白表达下降。结论:成年假孕大鼠卵巢黄体自然退化中有细胞凋亡的发生,屈洛昔芬可加速假孕大鼠黄体细胞凋亡的出现并可缩短假孕期。Bax和Bcl-2蛋白的表达在假孕不同时间时无明显改变,而屈洛昔芬所诱导的Bax/Bcl-2的增加可能与该药物对黄体细胞凋亡的促进作用有关。

Effects of droloxifene on apoptosis and Bax, Bcl-2 protein expression of luteal cells in pseudopregnant rats

AIM: To study the effects of droloxifene on apoptosis and the expression of Bax and Bcl-2 protein in corpus luteum of pseudopregnant rats. METHODS: HE staining was used to examine the histological changes of ovaries. Apoptosis detection in situ was performed with TUNEL method. Expression of Bax and Bcl-2 protein was observed by immunohistochemistry analysis. RESULTS: Apoptosis of luteal cells during the spontaneous regression of corpus luteum of pseudopregnant rats appeared on d 13 of pseudopregnancy, and the marked increase of apoptotic luteal cells could be observed on d 15. When pseudopregnant rats were treated with droloxifene 20 mg . Kg on d 2, apoptosis of luteal cells could be observed on d 8 and the duration of pseudopregnancy could be shortened from (15.5 +- 1.1) d to (12.8 +- 1.6) d. In pseudopregnant rats, the expression of Bax and Bcl-2 protein was found in the cytoplasm of luteal cells. However, no obvious differences in the intensity or localization could be found during various days of the pseudopregnancy, while an increase in Bax and a decrease in Bcl-2 protein expression could be induced by droloxifene treatment. CONCLUSION: Droloxifene could facilitate apoptosis of luteal cells in pseudopregnant rats and shorten the period of pseudopregnancy. An increased Bax/Bcl-2 ratio might be involved in the facilitation of apoptosis induced by droloxifene in corpus luteum of pseudopregnant rats.