雌激素受体β基因多态性与肝细胞癌的关系

目的 探讨雌激素受体β(Erβ)基因多态性与肝细胞癌的关系.方法 选取2005年10月至2007年5月重庆医科大学附属第一医院收治的100例肝细胞癌患者为实验组,100例非肝病患者作为对照组.应用分子生物学的方法检测ERB基因Rsa Ⅰ及Alu Ⅰ限制性片段长度和5号内含子高变区核苷酸(CA)重复序列在两组中的分布.应用χ2检验、Fisher确切概率法、Logistic回归模型分析检测结果.结果 Rsa Ⅰ和Alu Ⅰ限制性片段长度多态性在两组中均呈多态性分布(χ2=11.375,6.162,P<0.05).R等位基因使人患肝细胞癌的风险是r等位基因的51.7%,A等位基因使人患肝细胞癌的风险是a等位基因的2.086倍.5号内含子高变区分离出9种CA重复序列等位基因CA16～24,两组等位基因的分布频率比较,差异无统计学意义(χ2=7.155,P>0.05).以n≤20作为SS型,n>20为LL型,实验组SS型等位基因为66%,对照组为51%,两组比较差异有统计学意义(χ2=4.634,P<0.05).结论 Erβ基因多态性与肝细胞癌发生有关,R等位基因可能是其保护因素,A等位基因和SS型等位基因可能是其危险因素.     

常吃润肤餐 越变越好看

女性到了25岁这个年龄,皮肤的新陈代谢便开始走下坡路,特别是到了30岁以后,繁重的工作压力,不规律的生活习惯、不合理的饮食——稍不留心,就会被岁月提前做上记号:皮肤特别容易变得干燥、没有光泽,眼角、嘴角也会悄悄冒出小小的细纹。其实这也是女性身体中的雌激素在起变化。医学专家认为:雌激素对女人来讲非常重要,它是维系女人第二特征的重要因素。雌激素可以使女人的     

Neuroprotective effect of estrogen after chronic spinal cord injury in ovariectomized rats

BACKGROUND: At present, there is still lack of effective drugs for chronic spinal cord injury, whereas it is found recently that estrogen has a neuroprotective effect on brain and spinal cord injuries. OBJECTIVE: To observe the effect of estrogen on the apoptosis of nerve cells after gradual chronic spinal cord injury in ovariectomized rats. DESIGN: A randomized controlled animal trial. SETTING: Institute of Orthopaedics, the Second Hospital of Lanzhou University. MATERIALS: Sixty-five female Wistar rats of common degree, weighing 220–250 g, were provided by the experimental animal center of Lanzhou University. The rats were randomly divided into sham-operated group (n =5), estrogen-treated group (n =30) and saline control group (n =30), and the latter two groups were observed at 1, 3, 7, 14, 28 and 60 days respectively, and 5 rats for each time point. METHODS: All the rats were treated with bilateral oophorectomy 2 weeks before the experiment. T10 vertebral lamina was revolved into using plastic screw. The spinal canal impingement was not induced initially. After that, the original incision was opened to expose the screw every 7–10 days. MAIN OUTCOME MEASURES: The apoptosis and Caspase-3 positive cells in the damaged spinal cord were detected using terminal deoxynucleotidal transferase-mediated dUTP-biotin nick end labeling (TUNEL) method and Caspase-3 immunohistochemical staining at 1, 3, 7, 14, 28 and 60 days after chronic spinal cord injury respectively. RESULTS: Totally 65 rats were used, and the deleted ones during the experiment were supplemented by others. Changes of Caspase-3 expression after spinal cord injury: In the sham-operated group, only a small amount of Caspase-3 proteins were observed in the rat spinal cord, mainly located in motor neurons of spinal cord anterior horn. In the estrogen-treated group and saline control group, positive cells expressed occasionally at 1 day postoperatively, began to increase obviously at 7 days after injury, strongly expressed at 14 and 28 days, but decreased at 60 days, mainly located in the neurons of spinal cord gray matter anterior horn, and they expressed fewer in the motor neurons and white matter of ventral horn, and there were obvious differences between the estrogen-treated group and saline control group at 7, 14, 28 and 60 days (P < 0.05). CONCLUSION: Estrogen can reduce the apoptosis of nerve cells and promote the recovery of neurological function following gradual chronic spinal cord injury.     

肺血管扩张在肝肺综合征发病机制中作用的研究进展

肺血管扩张是肝肺综合征的主要发病机制,然而导致HPS肺血管扩张的机制相当复杂,至今仍不清楚.目前认为肺血管内巨噬细胞聚积和雌激素升高导致的血管活性因子增多和活性增强可能与此有关,近年来这方面的研究很多,本文对此作一综述.     

植物雌激素与前列腺癌及良性前列腺增生

植物雌激素是一类广泛分布于各类植物中的结构与雌激素相似并具有弱雌激素及抗雄激素活性的天然活性物质。PCa与BPH是雄激素依赖性及与年龄相关的疾病,近年来流行病学调查和实验研究均表明植物雌激素对PCa与BPH有防治作用。其机制可能与植物雌激素对性激素的调节、对细胞增生的抑制、诱导细胞凋亡及抗氧化作用等有关。     

尼尔雌醇和左炔诺孕酮对人成骨肉瘤 MG-63细胞株雌激素受体亚型的作用

目的：观察不同浓度的尼尔雌醇(NYL)和左炔诺孕酮(LNG)对人成骨肉瘤MG-63细胞株ERα和ERβ表达的作用，探讨旁分泌效应对ERα和ERβ基因表达的影响。方法：人成骨肉瘤MG-63细胞株分为（1）空白对照组：用含1% BSA无血清MEM培养液培养48 h；（2）阳性对照组：培养液中加入10-8 mol/L的17β-estradiol (E2) 培养48 h；（3）药物处理组：培养液中分别加入10-10，10-8，10-6 mol/L的NYL或LNG培养48 h；（4）药物处理+换液组：培养液中分别加入10-10 mol/L的NYL或10-8 mol/L LNG培养48 h，每12 h更换新的含有相应药物的培养液。用半定量RT-PCR检测各组细胞ERα和ERβmRNA的表达。结果：NYL及LNG均能诱导ERα和ERβ亚型mRNA表达上调，诱导ERαmRNA表达的最强作用浓度均为10-6 mol/L。NYL，LNG对ERβ mRNA表达最强作用浓度分别为10-10，10-8 mol/L。每12 h更换干预培养液对ERα表达无影响，但可抑制ERβ的表达。结论：NYL和LNG均可诱导MG-63细胞株ERα和ERβ mRNA表达上调，且2种亚型的表达存在相互制约关系；在NYL和LNG诱导ER亚型表达上调过程中ERβ的表达可能受到旁分泌作用的影响。     

补肾法防治绝经后骨质疏松症临床与实验研究

补肾法防治绝经后骨质疏松症临床与实验研究窦永起，赵美玲骨质疏松症是中老年妇女绝经后常见的代谢性骨疾病，其特点是骨量减少，骨折危险性增大及非创伤性骨折，其主要病因是雌激素缺乏造成骨质吸收超过骨质形成。雌激素替代疗法可抑制骨代谢，防止骨丢失，被广泛应用于...