17β-雌二醇和跑台运动对去卵巢大鼠骨组织及子宫ERα蛋白表达影响的对比研究

目的：雌激素受体α（ERα）作为雌激素调节骨效应的主要受体在雌激素对骨量和骨代谢的调节中发挥重要的作用,为此本研究比较了17β-雌二醇（E2）和跑台运动对去卵巢大鼠骨组织和子宫ERα蛋白表达影响的异同。方法：将40只健康3月龄雌性SD大鼠,按体重分层后随机分为假手术、去卵巢、雌激素和运动四个组。手术1周后,雌激素组大鼠每周按体重颈部皮下注射三次17β-雌二醇,每次25μg／kg体重。运动组每周进行4次45min、速度18m／min、坡度5°的跑台训练。连续给药或运动处理14周后。采用放射免疫法和免疫组织化学法分别检测血清E2水平以及胫骨和子宫ERα蛋白表达的变化。结果：大鼠去卵巢后,子宫重量、子宫重量指数和血清E2水平显著下降,补充外源性17β-雌二醇后,三项指标均显著增加;但运动处理只能增加血清E2水平,对子宫重量和子宫重量指数均无显著影响。子宫EIh蛋白免疫组化结果显示：ERα在去卵巢组子宫内膜腔上皮、腺上皮及基质中的表达显著低于假手术组,而在雌激素组中的表达高于去卵巢组,运动组各部位ERα表达虽有所增加,但是增加的程度远低于雌激素组。胫骨近端ERα蛋白免疫组化结果显示：去卵巢后,胫骨近端骨骺端软骨细胞的细胞核内ERα表达减少,运动和雌激素干预后,胫骨近端ERα表达增加。结论：运动和雌激素处理均能刺激去卵巢大鼠子宫和骨组织ERα蛋白的表达,但运动处理无雌激素处理增加子宫重量的副作用。可见在绝经后骨质疏松的预防中,运动处理可能要优于雌激素处理。     

MLT抑制E2诱发的大鼠垂体PRL瘤的增生涉及雌激素受体的作用

目的：探讨褪黑素（melatonin,MLT）抑制17-β-雌二醇（17-β-estradiol,E2）诱发垂体催乳素（prolactin,PRL）瘤的增生及其机制的初始阶段,MLT对雌激素受体的作用。方法：在体实验采用每日定时给各组SD大鼠分别皮下注射不同浓度的MLT,建立MLT抑制E2诱发的垂体PRL瘤增生的动物模型。离体实验采用原代培养细胞原位杂交方法,探讨垂体PRL瘤细胞MLT受体的表达、MLT对雌激素受体（ER）表达的作用;应用电泳迁移率改变（EMSA）的方法,观察MLT对雌激素受体（ER）与雌激素反应元件（ERE）结合的效应。结果：每只大鼠每日定时皮下注射0．25或0．50mg MLT能显著抑制E2诱发的垂体PRL瘤的增生（分别P〈0．01、P〈0．05）;F4诱发的垂体PRL瘤细胞内有MLT受体MLT1a和MLT1b;给0．25mg／day／rat MLT组的大鼠垂体PRL瘤细胞内ER的表达显著减少（P〈0．01）、ER与ERE的结合量显著降低（P〈0．01）。结论：一定剂量的MLT能显著抑制E2诱发的SD大鼠垂体PRL瘤的增生,其作用机制之一可能与MLT抑制ER的表达、及其部分阻断ER与ERE的结合有关。     

雌激素和多巴胺对大鼠垂体组织中雌激素受体基因表达的影响

目的研究雌激素和多巴胺激动剂对雌激素受体在大鼠垂体组织表达的作用。方法20只成年雌性Wistar大鼠,切除卵巢后,随机分2组：（1）对照组（n=5）,皮下植入空白硅胶管;（2）雌激素组（n=15）皮下植入含有乙烯雌酚的硅胶管,8周后,两组各处死5只大鼠,雌激素组剩余大鼠（n=10）取出硅胶管,随机再分2组,安慰剂组（n=5）给予自来水灌胃,多巴胺组（n=5）给予溴隐亭（多巴胺激动剂）灌胃,用药4周后处死动物。放免法测定血清PRL水平,用反转录一聚合酶链反应（RT-PCR）方法检测ERs在各组垂体组织中的表达,以β-actin作为内参照,借助于计算机凝胶成像系统分析表达量。结果ERa,ERβ以及TERP在各组大鼠垂体组织均有表达,其中ERα和TERPmRNA水平在雌激素组明显高于对照组（P〈0．001）,在安慰剂组和多巴胺组的表达无明显差别。结论大鼠垂体组织中存在ER的表达,雌激素对ERα和TERP的表达具有升调节作用,多巴胺不影响雌激素受体的表达。     

不同疗法对去卵巢大鼠子宫ERα和ERRα蛋白表达的影响

目的:本研究旨在对比观察全身垂直振动、跑台运动、金雀异黄酮和氯化锂等不同干预疗法对去卵巢骨质疏松大鼠子宫雌激素受体α(ERα)和雌激素受体相关受体α(ERRα)蛋白表达的影响。方法:将80只3月龄雌性SD大鼠按体重分层后随机分为假手术组和去卵巢组。去卵巢10周时,将去卵巢组大鼠按体重分层后又随机分为去卵巢组、振动组、跑台组、金雀异黄酮组、氯化锂组和雌激素组,并开始进行不同的干预处理。干预处理8周时,腹主动脉取血处死各组大鼠,用放射免疫方法检测血清E_2水平,用Western blot检测子宫ERα和ERRα蛋白表达水平的变化。结果:大鼠去卵巢后,血清E_2水平显著下降,经雌激素处理后,血清E_2水平显著回升,但经其他几种方法处理后均无显著变化。Western blot结果显示,大鼠去卵巢后,子宫ERα蛋白表达水平显著增加,经雌激素、跑台运动、全身垂直振动和氯化锂处理后,子宫ERα蛋白表达水平显著下降,而经金雀异黄酮处理后,子宫ERα蛋白表达水平无显著变化。大鼠去卵巢后,子宫ERRα蛋白表达水平显著下降,经雌激素和金雀异黄酮干预后,子宫ERR-α表达水平显著增加,而经跑台运动、全身振动和氯化锂干预后,子宫ERR-α表达水平却显著下降。结论:跑台运动和全身垂直振动能抑制去卵巢骨质疏松大鼠子宫ERα和ERRα蛋白的表达,氯化锂能抑制ERα蛋白的表达,但促进ERRα蛋白的表达,金雀异黄酮能促进ERRα蛋白的表达,但对ERα蛋白的表达没有影响。     

益坤宁对围绝经期大鼠下丘脑雌激素受体表达的影响

目的检测益坤宁对围绝经期大鼠下丘脑雌激素受体（estrogen receptor,ER）表达的影响,探讨益坤宁治疗围绝经期综合征的作用机制。方法采用自然衰老的围绝经期大鼠,随机分为围绝经期对照组、西药对照组和中药实验组;另取5月龄青年雌性大鼠做青年对照组。各组大鼠分别连续灌胃给予生理盐水、利维爱、中药益坤宁和生理盐水4周。通过免疫组化观察大鼠下丘脑ER蛋白的表达部位;Western blot定量检测大鼠下丘脑ERα和ERβ蛋白表达。结果ERα、ERβ蛋白主要表达于细胞胞质中。围绝经期对照组与青年组相比,ERa、E邓蛋白表达量明显下降（P〈0．05,P〈0．01）;中药实验组与围绝经期对照组比较,ERα、ERB蛋白表达量均明显增多（P〈0．05,P〈0．01）;西药对照组与围绝经期对照组相比,ERα、ERβ蛋白表达量增多（P〈0．05）。结论益坤宁通过提高围绝经期大鼠下丘脑组织中ERα、ERβ蛋白表达水平,使ER的合成增加,从而提高雌激素靶组织中ER的含量以增强雌激素的生物活性而发挥治疗作用。     

PMSG和FSH同期发情处理对小鼠子宫、卵巢和输卵管中雌激素α受体分布的影响

目的从雌激素α受体（estrogen receptorα,ERα）的角度探讨孕马血清促性腺激素（pregnant mareserum gonadotropin,PMSG）和促卵泡激素（follicle-stimulating hormone,FSH）处理小鼠的卵巢、输卵管和子宫中,ERα分布是否有显著性差异。方法 10只8周龄母鼠,随机分为处理方式不同的两个组：PMSG组和FSH组,两组均在处理第48小时取其卵巢、输卵管和子宫样固定,采用免疫组织化学法分别观察组织中ERα分布情况。结果免疫组化结果显示,两个处理组小鼠卵巢、输卵管和子宫内膜的细胞中都有ERα表达;PMSG处理组卵巢中的初级卵泡和成熟卵泡上ERα阳性率和平均吸光度均显著高于FSH处理组;FSH处理组的输卵管中ERα阳性率和平均吸光度均高于PMSG处理组;FSH处理组子宫基质和腺上皮细胞中ERα的阳性率显著高于PMSG组,其中PMSG组基质中的平均吸光度显著高于FSH组,而子宫内膜上皮细胞的阳性率和平均吸光度两处理组间差异无显著性。结论 PMSG和FSH同期发情诱导由于其特性可不同程度地影响小鼠卵巢、输卵管和子宫中ERα的分布,使之在不同组织中产生差异性变化。     

菠菜和芫荽对雄性大鼠性功能的影响与植物雌激素样作用研究

目的:研究菠菜、芫荽对雄性大鼠性功能的影响,探讨植物雌激素样作用机制。方法:60只正常雄性SD大鼠,随机分为正常组(N组)、大豆对照组(A组)、菠菜组(B组)、芫荽组(C组)和菠菜+芫荽组(D组),每组12只,不同饲料干预20周后,进行性行为学试验并取材。采用放免法检测各组外周血清中T、E2、LH、FSH和PRL等性腺轴激素含量,HE染色观察睾丸组织形态学变化,IHC和western blot法检测大鼠睾丸中ERα,ERβ蛋白表达。结果:(1)性行为学检测结果:C和D组插入、射精潜伏期较N组显著延长(P0.05),爬背、插入,射精次数较N组显著减少(P0.05);D组插入潜伏期较A组显著延长(P0.05)(2)性激素水平检测结果:D组T水平较N组显著降低(P0.05);C组E_2水平较A组显著升高(P0.05),D组E_2水平较N、A组显著升高(P0.05);C和D组LH水平较N组显著降低(P0.05),同时C组LH水平亦较A组显著降低(P0.05);FSH水平在各组之间无显著差异(P0.05);D组PRL水平较N组显著降低(P0.05)。(3)睾丸HE染色结果:光镜下N组睾丸组织结构完整,B、C和D组睾丸组织形态结构发生明显变化,生精小管间连接疏松,间质细胞减少,生精细胞减少。(4)ERα和ERβ的表达结果:ERα和ERβ分别在睾丸中精原细胞和间质细胞中表达,其中ERα在B、C和D组表达较N组显著增多(P0.05),ERβ在各组间无显著差异(P0.05)。结论:芫荽及菠菜和芫荽联合干预可延长大鼠爬背、插入、射精潜伏期和减少其爬背、插入和射精次数,导致大鼠性功能障碍;具体机制可能与发挥雌激素样作用,升高血清中E_2水平,使ERα在睾丸间质中的表达增多,进而降低T水平有关。芫荽与大豆相比具有更强的雌激素样作用,而菠菜与大豆雌激素样作用接近,菠菜和芫荽联合干预出现累加效应。     

雌激素对成年和老年雌性大鼠血管平滑肌细胞雌激素受体α表达的影响及其机制

目的探讨雌激素对成年和老年雌性大鼠血管平滑肌细胞(VSMC)雌激素受体α(ERα)表达的影响及其机制。方法采用RT-qPCR、Western blot及重硫酸盐修饰后测序(BSP)的方法,检测体外培养的3-4代成年(2-3月龄)和老年(≥20月龄)雌性SD大鼠VSMC在无或有生理剂量(10-10 mol/L、10-8 mol/L)17β-雌二醇(E2)存在下,ERα的表达及其启动子区CpG岛甲基化水平的变化。结果成年雌性大鼠VSMC无论在有或无雌激素存在时均表达ERα,且表达水平随雌激素浓度增加而上升。而老年雌性大鼠VSMC无论是在mRNA水平还是蛋白质水平几乎检测不到ERα表达,即使补充雌激素达最高生理剂量也无法诱导ERα的重新表达,其ERα基因启动区CpG岛呈现高水平甲基化。结论成年大鼠VSMC表达ERα,且生理剂量雌激素对其表达具有诱导作用。而老年大鼠VSMC ERα基因由于CpG岛已发生高度甲基化而抑制,生理剂量雌激素对ERα表达的诱导作用丧失。     

转录因子E2F-1与垂体肿瘤转化基因（PTTG）在大鼠PRL瘤中的表达

目的通过检测垂体肿瘤转化基因（PTTG）与腺病毒E2启动子结合因子1（E2F-1）在大鼠催乳素（PRL）瘤中的表达来探讨两者在PRL瘤发生发展过程中的作用。方法 40只大鼠随机分为两组：实验组（E组,n=20）：皮下植入17β-雌二醇的方法诱发大鼠PRL瘤;对照组（C组,n=20）：皮下植入空白硅胶管。雌激素诱导10周后处死大鼠,心脏穿刺取血,4%多聚甲醛体内灌流取出脑垂体,称重,ELISA方法检测两组大鼠血清PRL水平,垂体组织行病理组织学观察,免疫组化SP方法检测两组大鼠垂体组织中PTTG蛋白质、E2F-1蛋白质的表达。结果雌二醇作用10周后,据垂体重量、垂体组织学变化和血清PRL水平证实PRL瘤诱导成功。PRL瘤组中,PTTG蛋白质、E2F-1蛋白质均明显高于对照组,差异具有统计学意义（P〈0.01）;且PTTG蛋白质和E2F-1蛋白质的表达呈明显正相关（γ=0.764,P〈0.01）。结论 PTTG与E2F-1在大鼠PRL瘤中共同过度表达,参与了大鼠PRL瘤的发生发展。     

卵巢切除对大鼠子宫阴道雌激素受体亚型表达的影响

目的 通过观察雌激素受体亚型在去势大鼠子宫和阴道的表达, 研究卵巢切除对大鼠子宫、阴道的影响机制.方法 60只成年SD雌性大鼠随机分为正常组、假手术组、去势组,每组20只.8周后处死大鼠,分离摘取子宫、阴道,进行ERα、ERβ免疫组织化学染色和mRNA半定量RT-PCR检测.结果 ERα在各组子宫内膜上皮细胞、间质细胞及平滑肌细胞中均有表达,以内膜腔上皮和腺上皮细胞表达最强;ERα在各组阴道粘膜上皮细胞、间质细胞及平滑肌细胞中均有表达,以粘膜上皮细胞中表达最强.去势组子宫、阴道ERα表达水平较其它两组明显降低.ERβ主要在正常组和假手术组子宫内膜腔上皮细胞、腺上皮细胞和阴道粘膜上皮细胞中有表达,但较ERα表达弱.ERβ在去势大鼠子宫和阴道中未见明显表达.正常组和假手术组子宫、阴道雌激素受体亚型的表达强度和分布无明显差异.结论 卵巢切除后大鼠子宫、阴道ER亚型表达明显降低,尤其以ERβ表达下调明显.     

大豆异黄酮对雌鼠初情期等生殖性状的影响

目的通过研究大豆异黄酮对雌鼠初情期等生殖性状的影响,为母鼠的安全饲喂提供实验依据。方法本实验选用210只21日龄ICR雌鼠随机分成3组,饲喂含不同浓度大豆异黄酮（0 mg/kg、50 mg/kg、400 mg/kg）的饲料。每日检查母鼠阴道开张和阴道栓情况。采集母鼠45和65日龄时血清,利用ELISA方法检测血清中雌激素含量,并统计45、65日龄体重和子宫重。利用免疫组织化学方法检测子宫上皮雌激素受体的表达分布情况。结果雌鼠阴道开张的平均日龄分别为27.2 d、26.1 d和25.8 d,400 mg/kg组显著早于剂量为0mg/kg的对照组（P〈0.05）;雌鼠平均初次配种时间各组间差异不显著（P〉0.05）;饲养到45日龄和65日龄时400 mg/kg组雌鼠体重显著高于对照组（P〈0.05）。喂养8周后两个试验组在子宫间质细胞上雌激素受体的阳性细胞表达率显著高于对照组;在腺上皮中400 mg/kg组显著高于50 mg/kg组和对照组（0 mg/kg）;但是在腔上皮中,各组间受体的阳性细胞表达率差异不显著（P〉0.05）。结论饲喂每公斤含400 mg大豆异黄酮的饲料可以刺激初情期前母鼠阴道的开张,提高雌鼠的体重,降低65日龄时血清雌激素含量,并在饲喂8周后影响子宫间质和腺上皮上雌激素受体的表达分布;而饲喂每公斤含50 mg大豆异黄酮的饲料仅对小鼠45日龄体重及饲喂8周后子宫间质上雌激素受体的表达分布有所影响。     

饲喂雌鼠大豆异黄酮对后代雌性生殖性状的影响

目的研究雌性小鼠饲喂异黄酮后对其后代雌鼠生殖性状的影响。方法分别在雌鼠从断奶到妊娠前和妊娠期间两个不同阶段的日粮中添加不同剂量的大豆异黄酮（0、50、400 mg/kg）。记录F1代的出生窝产仔数、出生窝重、雌鼠的阴道最早开张时间和最早见栓时间,以及后代雌鼠性成熟期和体成熟期生殖器官重量、血清雌激素的含量。结果雌鼠妊娠期饲喂含50、400 mg/kg大豆异黄酮的饲料后F1代的窝产仔数显著高于对照组（P〈0.05）;雌鼠妊娠期采食400 mg/kg大豆异黄酮饲料,其后代雌鼠初次配种时间明显延迟（P〈0.05）;45、65日龄体重显著低于对照组,65日龄子宫重显著低于对照组,卵巢重显著高于对照组;血清中雌激素含量显著低于对照组（P〈0.05）,妊娠期间采食50 mg/kg大豆异黄酮饲料,其F1代雌鼠仅窝产仔数和45日龄时血清中雌激素含量受到影响;而雌鼠从断奶到怀孕期间饲喂含大豆异黄酮饲料的F1代在各项指标与对照组均差异无显著性。结论雌鼠妊娠期间饲喂含400 mg/kg大豆异黄酮的饲料会显著影响其雌性后代的初情期、生殖器官发育、血清雌激素含量等生殖生理性状,而在非妊娠期饲喂含大豆异黄酮饲料对F1代无显著影响。     

Effects of quinestrol on reproductive hormone expression, secretion, and receptor levels in female Mongolian gerbils (Meriones unguiculatus)

Quinestrol, a synthetic estrogen with marked estrogenic effects and prolonged activity, has potential as a contraceptive for Mongolian gerbils. The objective of this study was to describe the effects of quinestrol on reproductive hormone expression, secretion, and receptor levels in female Mongolian gerbils. Serum and pituitary concentrations of follicle stimulating hormone (FSH) and luteinizing hormone (LH) were decreased, whereas serum concentrations of estradiol (E2) and progesterone (P4) were increased after quinestrol treatment; the effects were both time- and dose-dependent. Furthermore, quinestrol downregulated expression of FSHβ and LHβ mRNA in the pituitary gland, as well as FSH receptor (FSHR) and estrogen receptor (ER) β in the ovary. However, it up-regulated mRNA expression levels of ERα and progesterone receptor (PR) in the pituitary gland and uterus, as well as mRNA for LH receptor (LHR) and PR in the ovary (these effects were time- and dose-dependent). In contrast, quinestrol had no significant effects on the mRNA expression levels of ERα in the ovary, or the gonadotropin α (GtHα) subunit in the pituitary gland. We inferred that quinestrol impaired synthesis and secretion of FSH and LH and that the predominant ER subtype in the pituitary gland of Mongolian gerbils may be ERα. Overall, quinestrol disrupted reproductive hormone receptor expression at the mRNA level in the pituitary-gonadal axis of the Mongolian gerbil.     

Estrogen receptor-beta agonist diarylpropionitrile counteracts the estrogenic activity of estrogen receptor-alpha agonist propylpyrazole-triol in the mammary gland of ovariectomized Sprague Dawley rats

Although estrogen can bind both types of estrogen receptors, estrogen receptor-alpha (ERα) is dominant in mediating estrogenic activity in the mammary gland and uterus. Excessive estrogenic activity such as estrogen-based postmenopausal hormone replacement therapy increases the risk for breast and endometrial cancers. The adverse effect of estrogen on uterine endometrium can be opposed by progestins; however, estrogen-plus-progestin regimen imposes substantially greater risk for breast cancer than estrogen alone. In this study, we used ERα-selective agonist propylpyrazole-triol (PPT) and ERβ-selective agonist diarylpropionitrile (DPN) to activate ERα and estrogen receptor-beta (ERβ) separately in an ovariectomized rat model and determined whether PPT-activated ERα function in the mammary gland can be suppressed by DPN activated ERβ. Ovariectomized rats were randomly divided into six groups and treated with DMSO (control), DPN, PPT, PPT/DPN, PPT/Progesterone, and PPT/Progesterone/DPN, respectively. In the mammary gland, PPT but not DPN increased cell proliferation and amphiregulin gene expression; importantly, the stimulatory effect of PPT on mammary cell proliferation and amphiregulin gene expression can be suppressed by DPN. In the uterus, the effect of PPT on uterine weight and endometrial cell proliferation was not inhibited by DPN but can be inhibited by progesterone. These data provide in vivo evidence that PPT activated ERα activity in the mammary gland can be opposed by ERβ-selective agonist DPN, which may be explored for the development of better hormone replacement therapy regimen with less risk for breast cancer.     

Estrogen modulates the action of nitric oxide in the medial preoptic area on luteinizing hormone and prolactin secretion

Several substances work as neuromediators of the estrogen direct and indirect (through glial cells or interneurons) action on luteinizing hormone- releasing hormone (LH-RH) neurons in medial basal hypothalamus and medial preoptic area (MPOA).Angiotensin II (AII) in the MPOA stimulates the LH and it inhibits PRL secretion in some situations. On the other hand, the effect of excitatory amino acids on LH and PRL surges during proestrus as well LH surge induced by steroids depend on nitric oxide (NO). In the present study we investigated the participation of MPOA endogenous NO on gonadotropin and PRL secretion mediated by estrogen and AII. Plasma LH, FSH and PRL was determinated in estrogen primed and unprimed ovariectomized Wistar rats that received microinjection of AII or saline into the MPOA, associated or not with a previous microinjection of an inhibitor for NOS. Our results show the following: 1 - there was no change in plasma FSH in estrogen- primed or unprimed ovarictomized related with microinjections of AII or NO antagonist in the MPOA; 2- the increase in LH secretion after ovariectomy depends on, at least in part, NO activity in the MPOA; 3- estrogen may have an indirect negative feedback action on LH-RH neurons in the MPOA through NO; 4- the stimulatory action of AII in the MPOA on LH secretion in ovariectomized rats treated with estrogen depends on NO; 5 - NO in the MPOA stimulates or inhibits PRL secretion depending on the absence or presence of estrogen, respectively; 6- the inhibitory action of AII into the MPOA on PRL secretion does not seem to depend on NO.     

Effects of dodder total flavone on polycystic ovary syndrome rat models induced by DHEA combined HCG

AimsExplore the effects of dodder total flavone on polycystic ovary syndrome (PCOS) rat models induced by dehydroepiandrosterone (DHEA) combined human chorionic gonadotropin (HCG).MethodsExcept the blank group, the rest of the rats were injected with DHEA 6 mg/100 g on the back of the neck and 1.5 IU HCG each day, for 21 consecutive days. On the 16th day of modeling, vaginal smear was performed to select the model rats, which were randomly divided into model group, dacin-35 group, large, middle and small dose dodder total flavonoids groups, and given the medicine for three weeks. At the end of the last administration, take samples, so as to calculate the ovaries and uterus indexes, measure serum LH/FSH ratio, P, PRL and INS levels, fixed the uterus and pancreas in 10% formalin solution and stained with HE to observe the morphological changes of the organs. And measure the expression of TNF-α and IGF-l proteins in ovaries by immunohistochemistry.ResultsCompared with the blank group, ovarian and uterine indexes, serum LH/FSH ratio, serum PRL and INS levels, ovary TNF-α and IGF-l protein expression were significantly increased, and significant pathological changes were observed in the uterine and pancreatic tissues in model group (P < 0.01). While the serum P level decreased significantly (P < 0.01), Compared with the model group, the ovarian and uterine indexes, serum LH/FSH ratio, serum P, PRL and INS levels, ovary TNF-α protein expression were significantly decreased in large, middle and small dose dodder total flavonoids groups (P < 0.01); The expression of IGF-1 protein was decreased and uterus pathological changes were improved in different extents (P < 0.01 or P < 0.05), pancreas pathological changes were improved significantly (P < 0.01).ConclusionPCOS rat models was successfully replicated. Dodder total flavone can protect PCOS rats induced by DHEA combined HCG by different action pathways.     

雷洛昔酚对大鼠垂体的作用

目的 观察雷洛昔酚是否能诱发出催乳素瘤的动物模型以及对PRL水平的影响,以研究雷洛昔酚对大鼠垂体的作用.方法 雌性Wistar大鼠切除卵巢后,分别在皮下埋植含有雷洛昔酚、雌激素和空白硅胶管,术后8周处死大鼠,检测大鼠体重变化、垂体重量变化、血清催乳素(PRL)水平和垂体组织学变化.结果 雷洛昔酚组与阴性对照组大鼠体重无明显统计学差异,与雌激素组大鼠体重具有统计学差异(P＜0.05);雷洛昔酚组与阴性对照组大鼠垂体重相比无明显差异,与雌激素组大鼠垂体重相比具有统计学差异(P＜0.05);雌激素组大鼠血清PRL水平最高,阴性对照组血清PRL水平最低,雷洛昔酚组介于两者之间,分别与雌激素组、对照组相比较差异均具有统计学意义(P＜0.05);雷洛昔酚组与对照组垂体病理为正常细胞形态,雌激素组垂体病理为PRL瘤表现.结论 雷洛昔酚对大鼠垂体有一定的影响,但不能诱发催乳素瘤.