Changes of Estrogen in Serum and Estrogen Receptor β in the Relevant Brain Regions Following Mating Behavior of the Male Mandarin Vole Microtus mandarinus

In order to investigate the estrogen and estrogen receptor β changes after mating behavior of male mandarin vole （Microtus mandarinus）, the radioimmunoassay （RIA） and immunohistochemistry methods were used to investigate changes of the serum estrogen （E） concentrations, estrogen immunoreactive neurons （E-IRs） and estrogen receptor β immunoreactive neurons （ERβ-IRs） in the relevant brain regions following mating behavior. Fifteen sexually matured male voles were randomly divided into three groups and treated differently： （1） control group： voles were exposed to clean hard-wood shavings （n=5）, （2） exposure group： voles were exposed to the soiled bedding for more than 24h on which estrous females had been placed （n=5）, and （3） mating group： voles were placed with an estrous female for more than 24h （n=5）. The results showed circulating serum E concentrations were significantly higher in the mating group than in the exposure group and the control group, and there were no significant difference between the exposure group and the control group. E-IRs and ERβ-IRs were detected in the following brain regions related to mating behavior： the arcuate nucleus （ARC）, bed nucleus of the stria terminalis （BST）, lateral septal nucleus （LS）, medial amygdaloid nucleus （ME）, medial preoptic area （MPO） and ventromedial hypothalamic nucleus （VMH）. The results showed that there were significantly more E-IRs in the six brain regions in the mating group than in the control group and the exposure group, and there were no significant difference between the exposure group and the control group except for LS. There was no significant difference in ERβ-IRs in the six brain regions among the three groups, and there were some lighter -stained ERβ-IRs in these brain regions. The results suggested that estrogen affect mating activity of male mandarin voles, but ERβ might not play an important role in mating behavior of male mandarin voles. Instead, it might be through other receptors.

雌激素受体β与乳腺癌

乳腺癌是一种激素依赖性肿瘤。雌激素受体α（ERα）在雌激素介导的乳腺癌发生、发展中起重要作用。然而，最近研究发现乳腺癌细胞的雌激素受体存在另一亚型——雌激素受体β（ERβ），也可能在乳腺癌的发生、发展中起重要作用。与ERd的作用不同，ERβ在细胞实验和动物模型研究中表现出对乳腺癌细胞增殖抑制作用。文章从ERβ与ERd及孕激素受体（PR）的关系、乳腺癌浸润与转移及对内分泌治疗的影响等方面阐述其与乳腺癌的关系。

HIF-1α、ERα和MMP-9在甲状腺乳头状癌中的表达及临床意义

目的探讨乏氧因子-1α(hypoxia inducible factor-1α,HIF-1α)、雌激素受体α(estrogen receptorα,ERα)与基质金属蛋白酶-9(matrix metalloproteinases-9,MMP-9)在甲状腺乳头状癌中的表达及与临床因素的关系。方法采用免疫组化技术对88例乳头状癌及癌旁组织中HIF-1α、ERα和MMP-9的表达情况进行检测,分析三者与临床参数的关系。结果甲状腺乳头状癌(papillary thyroid carcinoma,PTC)组织中HIF-1α、ERα和MMP-9三者阳性率(70.45%,62.5%和84.1%)均高于癌旁组织(P<0.01);PTC组织中HIF-1α、ERα和MMP-9阳性率与淋巴结转移和临床分期有关。在淋巴结转移组和临床Ⅲ~Ⅳ期病例3者阳性率均高于无淋巴结转移组和临床Ⅰ~Ⅱ期病例(P<0.05或P<0.01);ERα阳性率在直径>2 cm的病例高于直径≤2 cm者(P<0.05);HIF-1α与ERα、HIF-1α与MMP-9阳性率呈正相关(均为P<0.01);ERα阳性率与MMP-9也呈正相关(P<0.01)。结论甲状腺乳头状癌中HIF-1α、ERα高表达可能通过MMP-9参与PTC的临床进程。

单硝酸异山梨酯阴道栓剂联合17β-雌二醇对去势大鼠子宫内膜的影响

目的探讨单硝酸异山梨酯(IMN)阴道栓剂对小剂量雌激素17β-雌二醇(E2)支持下的去势大鼠子宫内膜的影响,了解IMN是否有增加子宫内膜营养的作用。方法将40只SD成年♀大鼠均分为假手术组(SHAM组)、去势组(OVX组)、模型组(OVX+E2组)、IMN灌胃+E2组、IMN阴道栓剂+E2组。除OVX组外,其余去势大鼠于术后给予3μg E2支持,并ig或者阴道栓塞1.44 mg IMN,连续给药2 d后,处死,SHAM组的大鼠于动情前期处死,分离子宫,称重后用甲醛固定,计算子宫系数,并行子宫HE染色后,用软件测量子宫内膜上皮厚度,Realtime PCR及免疫组化检测子宫ERα的mRNA及蛋白水平的表达。结果大鼠去势后,子宫发育不良,OVX组与SHAM组比较,在子宫系数、子宫内膜上皮厚度、ERα的mRNA和蛋白的表达量都明显下降(P<0.05或P<0.01)。去势后使用小剂量的E2,子宫状态有所改善,E2联合使用IMN灌胃,大鼠子宫系数、子宫内膜上皮厚度、ERα的mRNA和蛋白的表达量较单用E2增加,但是无显著性差异。而E2联合使用IMN阴道栓剂比单用E2可明显增加子宫系数、子宫内膜上皮厚度、ERα的mRNA和蛋白的表达量(P<0.05或P<0.01)。结论大鼠去势后子宫发育明显下降,IMN阴道栓剂能明显促进小剂量雌激素支持的大鼠子宫发育,可能与IMN通过改善子宫局部血管状态,上调作用有关。