促性腺激素释放激素类似物对乳腺癌细胞株化疗敏感性的影响

目的： 探讨促性腺激素释放激素类似物（GnRHa）对乳腺癌细胞株（MCF-7和MDA-MB-231）化疗敏感性的影响。方法：不同浓度的GnRHa（曲普瑞林,triptorelin）（10^－9 mol/L、10^－8 mol/L、10^－7 mol/L、10^－6 mol/L、10－5 mol/L）分别作用于MCF-7和MDA-MB-231细胞24 h、96 h和168 h后，用CCK-8方法检测细胞活性。用或不用GnRHa（10^－5 mol/L）处理96 h后，分别加入5-氟尿嘧啶（5-FU）或表阿霉素(EPI)作用24 h，用CCK-8法检测细胞抑制率。用RT-PCR检测GnRHa（10^－5 mol/L）作用168 h后GnRH受体、PCNA和MDR1 mRNA表达水平。结果：不同浓度GnRHa作用不同的时间后对乳腺癌细胞活性无影响。GnRHa（10^－5 mol/L）作用96 h后，5－FU和EPI对两种细胞的IC50不改变；GnRHa（10^－5 mol/L）不影响5－FU（MCF-7细胞0.5 g/L，MDA－MB－231细胞0.5 g/L）和EPI（MCF-7细胞1.2 mg/L,MDA－MB－231细胞0.8 mg/L）对两种细胞的抑制作用（P>0.05）。GnRHa（10^－5 mol/L）作用168 h后，MCF-7细胞的PCNA mRNA表达无改变。而在MDA-MB-231细胞，PCNA表达升高，差别有统计学意义（P<0.05）。在MCF-7对照组中，MDR1 mRNA有弱表达。GnRHa作用后，抑制了MDR1 mRNA表达。MDA-MB-231细胞GnRHa作用前后， MDR1 mRNA均无表达。结论：GnRHa不影响乳腺癌细胞株对5-FU和EPI的敏感性。GnRHa可能通过下调MDR1 mRNA表达水平，减弱MCF-7细胞的耐药性。     

人泌乳素腺瘤中ER、PTTG、bFGF的表达与肿瘤侵袭性的关系

目的探讨泌乳素腺瘤中雌激素受体(ER)、垂体瘤转化基因(PTTG)及碱性成纤维因子(bFGF)与肿瘤侵袭生长的关系。方法选择手术切除的泌乳素腺瘤标本46例,分为侵袭组和非侵袭组,采用免疫组化方法分别测定ER、PTTG和bFGF蛋白表达;从组织中提取RNA,经RT-PCR方法测定ER-mRNA和PTTG-mRNA。结果侵袭组ER、PTTG和bFGF蛋白表达的积分吸光度(IA)值分别为5385.1±1348.6、9874.2±2143.7和7938.5±1436.5,ER-mRNA和PTTG-mRNA吸光度比值分别为0.71和0.83,与非侵袭相比较差异显著(P<0.05)。结论ER、PTTG和bFGF与肿瘤的侵袭性密切相关,对肿瘤的发生,发展有重要作用。     

雌激素下调人乳腺癌细胞系MCF-7高迁移率蛋白的表达

目的 探讨雌激素与其拮抗剂他莫昔芬对人乳腺癌细胞系MCF-7高迁移率族蛋白(HMGB1)表达的影响。方法 在培养的MCF-7细胞中分别加入无水乙醇、不同浓度的17-beta-雌二醇(E2)和他莫昔芬培养4 d后。用实时荧光定量PCR和Western blot技术检测HMGB1 mRNA和蛋白水平。结果 17-beta-E2浓度在10-6和10-4 mol/L时,HMGB1 mRNA和蛋白的表达均显著低于对照组(P<0.05)。他莫昔芬浓度在10-6 和10-4 mol/L时,HMGB1 mRNA和蛋白的表达显著高于对照组（P<0.05)。结论 雌激素能够下调HMGB1的表达,而其拮抗剂他莫昔芬则相反。     

生长抑素及奥曲肽对肝星状细胞基质代谢的负调节作用

目的： 探讨生长抑素（SST）及其类似物奥曲肽（OCT）对大鼠肝星状细胞（HSCs）细胞外基质（ECM）代谢的影响。方法: 采用原位杂交、［3H］-脯氨酸掺入、酶联免疫吸附（ELISA）、免疫细胞化学染色法，分别检测SST、OCT处理后HSC中I型及III型胶原mRNA、基质金属蛋白酶（MMP）、基质金属蛋白酶抑制物（TIMP）的水平和胶原合成率，以及培养上清液中层黏连蛋白（LM）、透明质酸（HA）、III型前胶原（PCIII）的含量。结果: 10^-7 mol/L-10^-6 mol/L SST、10^-7 mol/L-10^-5mol/L OCT均可显著抑制HSC中I、III型胶原mRNA及胶原的表达，明显减少HA、LM、PCIII的分泌，且呈现剂量依赖关系。10^-6 mol/L SST及10^-6 mol/L-10^-5 mol/L OCT共孵育还可使HSC的TIMP-1合成明显下降，从而降低MMP-1/TIMP-1比例。结论: SST及其类似物可通过转录、翻译水平的调节，减少ECM合成，加速其降解，从而发挥抗肝纤维化作用。     

青藤碱抑制TNF-α诱导人脐静脉内皮细胞VCAM-1表达

目的： 研究青藤碱（SN）对肿瘤坏死因子-α（TNF-α）诱导脐静脉内皮细胞（HUVECs ）VCAM-1表达的影响。方法： 从新鲜脐带中分离培养HUVECs。用TNF-α诱导HUVECs表达VCAM-1，实验组加入不同浓度的SN(0.25、0.5和1.0 mol/L)或地塞米松（1.0×10^-6 mol/L）进行干预，培养12 h后收获细胞，用实时定量PCR检测VCAM-1 mRNA的表达，用流式细胞仪检测细胞表面VCAM-1表达。结果： TNF-α可诱导VCAM-1 mRNA和VCAM-1的表达。进行药物干预后，各干预组相对VCAM-1 mRNA表达有不同程度下降(P<0.05)。SN（1.0 mol/L）和SN（0.5 mol/L）干预组细胞表面VCAM-1表达下降(P<0.05)。SN（0.25 mol/L）和地塞米松（1.0×10^-6 mol/L）干预组未显示对TNF-α 诱导的VCAM-1表达有抑制作用。结论： SN可抑制TNF-α诱导的脐静脉内皮细胞VCAM-1的表达。     

八肽胆囊收缩素对TNF-α诱导的大鼠滑膜细胞株RSC-364 IL-6的作用及其可能的分子机制(英文)

目的: 观察硫酸化八肽胆囊收缩素（sCCK-8）对TNF-α诱导大鼠滑膜细胞株RSC-364 IL-6 mRNA 表达及核因子NF-κB的影响及其可能的受体机制。方法: 大鼠滑膜细胞株RSC-364经TNF-α(10　μg/L)、sCCK-8(10^-8-10^-6 mol/L)、CCK受体拮抗剂丙谷胺（2 mg/L）及溶剂单独或联合孵育3 h，用RT-PCR检测细胞IL-6、CCK-AR及CCK-BR mRNA的表达，孵育1 h，用电泳迁移率检测NF-κB活性，孵育30 min，用Western blotting检测胞浆IκB蛋白表达。结果: RSC-364细胞固有表达CCK-A/B受体，sCCK-8（10^-8-10^-6 mol/L）使IL-6、CCK-AR和CCK-BR mRNA表达进一步增高，明显增加TNF-α诱导的NF-κB活性，降低胞浆中IκB蛋白水平，并可被丙谷胺所拮抗。结论: sCCK-8通过NF-κB途径上调TNF-α诱导的大鼠滑膜细胞IL-6 mRNA表达，此作用可能通过滑膜细胞上的CCK受体实现，提示CCK-8在类风湿性关节炎（RA）发病过程中可能具有调控作用。     

雌二醇对大鼠海马神经干细胞增殖的影响

目的观察雌二醇对大鼠海马神经干细胞增殖的影响及其作用机制。方法取20只孕17d的SD大鼠海马组织,进行神经干细胞的培养和增殖,添加不同浓度的雌二醇(E2)。通过5-溴脱氧尿嘧啶核苷(BrdU)免疫荧光、MTT方法检测神经干细胞的增殖;通过免疫荧光技术和巢蛋白(Nestin)双标观察神经干细胞球中雌激素受体ERα和ERβ的表达情况。结果 BrdU与MTT检测结果显示,随着雌二醇浓度从10-10mol/L增加至10-8mol/L,神经干细胞数量逐渐增加。雌二醇在10-8mol/L时,细胞增殖数目最多而且细胞活力最好。随着雌二醇浓度进一步增加至10-6mol/L,神经干细胞增殖能力逐渐下降。免疫荧光技术检测显示神经干细胞均表达ERα和ERβ两种受体。结论在一定浓度范围内,雌二醇能促进海马神经干细胞的增殖,并可能是通过ERα和ERβ介导促进神经干细胞增殖。     

GPR30在雌激素促乳腺癌细胞迁移和侵袭中的作用机制研究

目的探讨G蛋白耦联受体30(GPR30)介导的雌激素非基因效应促乳腺癌细胞侵袭的作用及其机制。方法体外培养乳腺癌细胞株SK-BR-3(GPR30+,ERα-/ERβ-),分别给予不同浓度的17β-雌二醇(E2)和GPR30特异性激动剂(G1)处理不同时间,应用免疫印迹法观察黏着斑激酶(FAK)的磷酸化;转染GPR30 si RNA抑制GPR30表达后,采用Transwell侵袭小室法观察E2和G1对细胞迁移和侵袭的影响。结果与对照组比较,不同浓度的E2(10-10、10-9、10-8、10-7、10-6mol/L)或G1(10-8、10-7、10-6 mol/L)处理SK-BR-3细胞20 min,均能促进FAK的磷酸化。转染GPR30 si RNA 48h抑制GPR30表达后,E2、G1促进FAK磷酸化的效果均明显减弱。E2、G1均可明显促进SK-BR-3细胞的侵袭。而转染si RNA GPR30抑制GPR30表达后,E2、和G1促进细胞侵袭的能力明显减弱。结论雌激素可通过作用于GPR30激活非基因效应诱导FAK的磷酸化,增加乳腺癌细胞的侵袭能力。     

重组人内抑素对人瘢痕疙瘩成纤维细胞形态及增殖的影响

目的 观察重组人内抑素(rhEndostatin)对体外培养的人瘢痕疙瘩成纤维细胞(KFs)增殖的影响。方法 体外培养及鉴定人KFs; 应用四甲基偶氮唑盐（MTT）法分别检测不同浓度rhEndostatin (6.25×10^-6、1.25×10^-5、2.50×10^-5、5.00×10^-5、1.00×10^-4mg/L)作用24h、48h、72h后对KFs增殖的影响,并同时观察其形态变化。结果 组织块接种7~8d后,其周边可见少许梭形细胞,继之细胞逐渐增多并以组织块为中心呈放射状生长;传2代培养的细胞单层排列,形态均一,呈长梭状,折光性好。细胞波形蛋白免疫化学染色显示胞质均呈棕黄色。rhEndostatin(6.25×10^-6 mg/L浓度组除外)能明显抑制KFs的增殖(P <0.05),抑制效应与rhEndostatin浓度和作用时间呈一定的依赖关系; 其中,5.00×10-⁵ mg/L 和1.00×10^-4 mg/L组rhEndostatin作用48 h后,细胞生长缓慢,体积变小,数目减少,排列紊乱。结论 重组人内抑素对人KFs增殖具有抑制作用。     

AngⅡ诱导血管内皮细胞衰老及凋亡相关基因的表达

目的： 探讨血管紧张素Ⅱ（AngⅡ）诱导人脐静脉内皮细胞(HUVECs)衰老及凋亡相关基因Bcl-2、Bax的表达。方法: 体外培养人脐静脉内皮细胞, 采用四甲基偶氮唑蓝比色法测定内皮细胞存活率，用AngⅡ(10^-6mol/L)及valsartan（AngⅡ1型受体特异性拮抗剂）干预,分为实验对照组、AngⅡ诱导组及valsartan组，采用β-半乳糖苷酶染色和流式细胞术鉴定细胞衰老，通过Hoechst33258荧光染色观察细胞形态学变化，并利用免疫细胞化学染色法、RT-PCR法和Western blotting分析各组细胞凋亡相关基因Bcl-2、Bax mRNA及蛋白的表达水平。结果: 与对照组相比，10^-6mol/L AngⅡ诱导组存活的细胞数为对照组的（81.90±0.04)%; (80.10±6.81)%的细胞呈现β-半乳糖苷酶阳性染色。流式细胞仪检测细胞周期停滞于G₀-G₁［(91.36±6.45)%］，证实细胞衰老；荧光显微镜可见明显的细胞凋亡［(31.84±2.86)%］。与AngⅡ诱导组相比，valsartan组Bcl-2mRNA及蛋白表达水平明显增高(P<0.05), Bax mRNA及蛋白表达水平降低（P<0.05）。结论: AngⅡ可诱导体外培养的HUVECs老化。经AngⅡ诱导的衰老HUVECs发生凋亡，提示细胞凋亡参与了AngⅡ诱导HUVECs细胞的衰老过程。AngⅡ诱导血管内皮细胞衰老的分子机制之一可能与Bcl-2、Bax mRNA及蛋白表达的失衡有关。缬沙坦对血管内皮细胞衰老有一定保护作用。     

前列腺间质细胞中雌二醇对MMP-2，MMP-9及其组织抑制因子表达的影响

目的： 研究雌二醇(E2)对前列腺间质细胞中基质金属蛋白酶(MMP-2、MMP-9）及其组织抑制因子1(TIMP-1)、TIMP-2和雌激素受体α、β（ERα、ERβ）的影响。方法： 实时定量PCR法检测E2在前列腺间质细胞中对MMP-2、MMP-9、TIMP-1、TIMP-2 mRNA水平的影响；半定量RT-PCR法检测E2对ERα、ERβ mRNA水平的影响。酶谱电泳法检测MMP-2、MMP-9的活性。Western blotting检测E2在前列腺间质细胞中对ERα蛋白水平的影响。结果： 前列腺间质细胞中有MMP-2和ERα mRNA的表达，未检测到MMP-9 mRNA；培养液中检测到MMP-2前体（pro-MMP-2），未检测到其活性形式，也未检测到MMP-9前体及其活性形式。用E2处理间质细胞后MMP-2 mRNA水平降低，pro-MMP-2蛋白量减少，雌激素受体抑制剂ICI 182.780可抑制此作用。E2对TIMP-1,2 mRNA表达无显著影响。E2能够增加前列腺间质细胞中ERα mRNA及其蛋白表达的水平。结论： E2能够通过ERα下调前列腺间质细胞中MMP-2的表达。     

Methylseleninic acid (MSA) inhibits 17β-estradiol-induced cell growth in breast cancer T47D cells via enhancement of the antioxidative thioredoxin/ thioredoxin reductase system

The purpose of this study was to clarify the cell growth inhibitory mechanism of human breast cancer cells caused by selenium (Se) compounds. In the presence of 17β-estradiol (E(2)) at physiological concentrations, growth of estrogen receptor α (ERα)-positive T47D cells was markedly inhibited by 1 × 10(-6) mol/L methylseleninic acid (MSA) with no Se related toxicity.Under conditions where cell growth was inhibited, MSA decreased ERα mRNA levels and subsequent protein levels; further decreasing expression of estrogen-responsive finger protein (Efp) which is a target gene product of ERα and promotes G2/M progression of the cell cycle. Therefore, the decline in Efp expression is presumed to be involved in G2 arrest. Coincidentally, the antioxidative thioredoxin/ thioredoxin reductase (Trx/TrxR) system in cells was enhanced by the synergistic action of E(2) and MSA. It has been reported that ROS-induced oxidative stress enhanced ERα expression. E(2) increased production of intracellular ROS in T47D cells. Meanwhile, MSA significantly decreased E(2)-induced ROS accumulation. From these results, activation of the Trx/TrxR system induced by the coexistence of MSA and E(2) suppresses oxidative stress and decreases expression of ERα, and finally induces the growth arrest of T47D cells through disruption of ERα signaling.     

褪黑激素对17—β—雌二醇诱致的大鼠垂体催乳素瘤细胞增殖的抑制作用

观察不同浓度的褪黑激素 (Melatonin ,MLT)对原代培养的大鼠垂体催乳素瘤细胞增殖的影响。用 80～10 0g体重的雄性Sprague Dawley(SD)大鼠 ,皮下埋置雌二醇诱致垂体催乳素瘤 (prolactinoma)形成后 ,取出瘤体 ,经消化、过滤、离心 ,用SFFD培养基重悬细胞 ,得细胞悬液 ,浓度为 0 75× 10 6/mL ,转入 2 4孔培养板中并加入相应剂量的MLT使其终浓度 (mol/L)分别为 10 -5、10 -7、10 -9、10 -11和 10 -13 ,另设空白对照组 ,于 37℃、5 %CO2 条件下培养 1h ,再在每孔中加入 2 μCi [3H] TdR继续孵育 2 4h后测counts/min值。结果显示 ,在对照组和各剂量 (mol/L)MLT用药组 10 -5,10 -7,10 -9,10 -11和 10 -13 的 [3H]-TdR掺入率分别为 2 0 38 75± 186 84,142 1 75±6 4 49,12 38 2 5± 6 1 72 ,92 4 0 0± 6 4 44 ,10 33 2 5± 12 7 2 2和 110 3 2 5± 15 1 5 3counts/min。表明 10 -5～10 -13mol/L的MLT能有效抑制 [3H] TdR在原代培养的垂体催乳素瘤细胞中的掺入 ,P <0 0 0 1。其中 ,以 10 -9mol/L的MLT的抑制作用最强 ,达 5 4 6 8%。提示在培养条件下 ,10 -5～ 10 -13 mol/LMLT能有效地抑制E2 诱导的垂体催乳素瘤细胞的增殖。     

Effects of aldosterone on synthesis of fibronectin and expression of transforming growth factor-beta1 mRNA in cultured rat mesangial cells]

AIM: To evaluate the effect of aldosterone (ALD) and spironolactone (SPI, one of the aldosterone receptor antagonists) on synthesis and secretion of fibronectin (FN) and expression of transforming growth factor-beta1 (TGF-beta1) mRNA in cultured rat mesangial cells. METHODS: (1) Mesangial cells were treated with medium containing different concentrations of ALD (10(-11), 10(-9), 10(-7) mol/L) and/or 10(-7) mol/L SPI for 48 h, while control cells were treated with vehicle only. The levels of FN in the supernatants were measured by ELISA method. The expressions of FN mRNA and TGF-beta1 mRNA were detected by semi-quantitative RT-PCR. (2) Mesangial cells were treated with 10(-9) mol/L ALD for 24, 48, 72 h. The levels of FN in the supernatants were measured by ELISA method. The expressions of FN mRNA and TGF-beta1 mRNA were detected by semi-quantitative RT-PCR. RESULTS: ELISA method showed that the level of FN in the supernatant of cultured rat mesangial cells stimulated with ALD increased significantly in a dose- and time-dependent manner. Also the expressions of FN mRNA and TGF-beta1 mRNA were increased significantly by ALD in a dose- and time-dependent manner by semi-quantitative RT-PCR. SPI inhibited the stimulating effect of ALD on synthesis of FN and expressions of FN mRNA and TGF-beta1 mRNA in cultured rat mesangial cells. CONCLUSION: ALD up-regulates the protein synthesis and mRNA expression of FN, and up-regulates the mRNA expression of TGF-beta1 in cultured rat mesangial cells. SPI inhibits the effect of ALD, and thus implication in the treatment of Glomerulosclerosis.     

雌激素对人乳腺癌细胞株MCF-7 KLK 6 mRNA和蛋白表达水平的影响

 目的： 探讨雌激素与其拮抗剂三苯氧胺对雌激素受体阳性人乳腺癌细胞株MCF-7组织激肽释放酶6（KLK 6）mRNA和蛋白（hK6）表达水平的影响。方法: 取生长良好的MCF-7细胞，在不同浓度的雌激素（17-βE2）和三苯氧胺存在下培养72 h后，收集细胞，分别采用荧光定量逆转录-聚合酶链反应和流式细胞术，检测KLK6 mRNA和蛋白表达水平的变化。结果: 实时荧光定量RT-PCR表明，当17-βE2浓度在10-12 mol/L时，与乙醇对照组无明显差异(P>0.05), 17-βE2浓度在10^-10 mol/L和10-8 mol/L时，KLK6 mRNA的相对含量显著少于乙醇对照组；流式细胞术分析表明, 代表hK6含量的相对荧光强度（AFI）显著低于乙醇对照组（P<0.01）。三苯氧胺（10^-6 mol/L）作用组KLK6 mRNA 的相对含量显著高于对照组（P<0.01）；hK6含量与对照组相比差异显著（P<0.01）。结论: 雌激素对MCF-7 KLK6 mRNA和蛋白表达水平有一定的下调作用，而三苯氧胺作用相反。     

Estrogen and progesterone receptor expression in macrophages and regulation of hepatocyte growth factor by ovarian steroids in women with endometriosis

BACKGROUND: Information regarding macrophage-mediated regulation of hepatocyte growth factor (HGF) by ovarian steroid hormones in women with endometriosis is limited. Therefore, we investigated the regulation of HGF by steroid hormones in isolated macrophages and stromal cells derived from women with or without endometriosis. METHODS: We isolated CD68 immunoreactive adherent macrophages in vitro from 46 women with endometriosis and 30 women without endometriosis. Estrogen receptor (ER) and progesterone receptor (PR) expression in macrophages was demonstrated by immunohistochemistry and RT-PCR. Production of HGF in the culture media of basal and ovarian steroid-stimulated macrophages was examined by enzyme-linked immunosorbent assay. Expression of mRNA for HGF and its receptor, c-Met in macrophages and stromal cells in response to ovarian steroid was investigated by RT-PCR. The single and combined effect of HGF and estrogen on the growth of macrophages and stromal cells was analysed by bromodeoxyuridine (BrdU) incorporation. RESULTS: ER and PR were expressed in isolated macrophages and intact tissue at the protein and mRNA levels. Macrophages derived from women with endometriosis produced significantly higher concentration of HGF (352.2 +/- 4.9 pg/ml) in conditioned media after treatment with estradiol (10(-8) mol/l) than that of basal macrophages (221.5 +/- 32.8 pg/ml, P<0.05) or women without endometriosis (170.6 +/- 2.6 pg/ml, P<0.05). These effects were less evident after treatment with progesterone. Treatment with tamoxifen (10(-6) mol/l) reversed the production of HGF and other macromolecules. Secretion of HGF in response to ovarian steroids was further enhanced after activation with lipopolysaccharide. The mRNA expressions of HGF and its receptor, c-Met, were also detected in macrophages and stroma in response to estrogen, suggesting an autocrine regulation. HGF mRNA expression was higher in cells of women with endometriosis than non-endometriosis women. Bromodeoxyuridine incorporation indicated that exogenous stimulation with HGF and estrogen, either alone or in combination, significantly increased the cell proliferation of both endometrial stroma and macrophages compared to that of non-endometriosis or non-treated cells. CONCLUSION: These results suggest that besides other inflammatory mediators, ovarian steroids also participate in the production of HGF by peritoneal macrophages which may be involved in the growth of endometriosis either alone or in combination with estrogen.     

Progesterone down-regulates insulin-like growth factor-I expression in cultured human uterine leiomyoma cells

BACKGROUND: Insulin-like growth factor-I (IGF-I) plays crucial roles in uterine leiomyoma cell growth through stimulating proliferation and inhibiting apoptosis. The present study was conducted to elucidate whether progesterone affects IGF-I and its receptor expression in cultured leiomyoma cells. METHODS: Isolated leiomyoma cells were subcultured in Phenol Red-free Dulbecco's modified Eagle's medium supplemented with 10% fetal bovine serum for 120 h and then stepped down to serum-free conditions for an additional 48 h in the presence or absence of 17beta-estradiol (E(2)) (10 ng/ml) or progesterone (100 ng/ml). IGF-I and its receptor mRNA and immunoreactive IGF-I in the cultured cells were assessed by quantitative RT-PCR with Southern blot analysis and by radioimmunoassay with Seppak C18 chromatography, respectively. The presence of estrogen receptor (ER) and progesterone receptor (PR) in cultured leiomyoma cells was immunocytochemically examined. RESULTS: Both treatment with progesterone alone and treatment with E(2) and progesterone combined significantly decreased IGF-I mRNA and protein expression in cultured leiomyoma cells compared with that in untreated cultures, but treatment with E(2) alone did not. IGF-I receptor mRNA expression in those cells was not affected by treatment with either E(2) or progesterone. Immunocytochemical analysis revealed that PR protein expression in cultured leiomyoma cells maintained in a serum-free condition for 48 h whereas ER protein expression in the cells remarkably decreased after 24 h culture under the serum-free condition. CONCLUSIONS: The present study provided evidence for the first time that progesterone down-regulates IGF-I mRNA and protein expression in cultured leiomyoma cells without affecting IGF-I receptor mRNA expression.     

雌激素剂量依赖性促进小鼠骨髓间充质干细胞的成骨分化

背景：绝经后骨质疏松的发病与雌激素水平的下降关系密切。 目的：观察不同浓度雌激素对小鼠骨髓间充质干细胞成骨分化能力的影响,及其与微小RNA-26a的关系。 方法：取小鼠股骨与胫骨骨髓,全骨髓贴壁法获得并纯化骨髓间充质干细胞,分别以0,10-10,10-9,10-8,10-7,10-6 mol/L的雌二醇对其成骨诱导过程进行干预。 结果与结论：雌二醇对骨髓间充质干细胞的增殖能力影响不明显,但可明显提高其成骨能力;同时雌二醇可促进骨髓间充质干细胞成骨基因RUNX2,OCN mRNA及RUNX2,SP7蛋白的表达,以10-9 mol/L雌二醇的作用最明显,但10-9 mol/L雌二醇促进微小RNA-26a mRNA表达的能力最弱。说明雌二醇可剂量依赖性促进骨髓间充质干细胞的成骨分化,微小RNA-26a可能在此过程中发挥作用。关键词：微小RNA-26a;雌激素;骨髓间充质干细胞;成骨分化;小鼠 doi:10.3969/j.issn.1673-8225.2012.19.003     

碘酸钾对人甲状腺癌细胞系周期的影响

目的探讨碘酸钾(KIO3)对人甲状腺鳞癌细胞系SW579细胞周期/增殖、细胞周期素D1(cyclin D1)及增殖细胞核抗原Ki67 mRNA/蛋白水平的影响。方法 CCK8法检测不同浓度(0、10-6、10-5、10-4、10-3、10-2和10-1mol/L)KIO3对细胞增殖的影响;0、10-6或10-2mol/L KIO3处理细胞48 h后,用碘化丙啶单染流式细胞术检测细胞周期;用实时定量PCR和Western blot分别检测cyclin D1和Ki67的mRNA及蛋白水平。结果 10-6mol/L或10-2mol/L KIO3分别促进或抑制SW579细胞增殖(P0.05);10-6mol/L组细胞G1期比例下降(P0.05),S期比例增加(P0.05),而10-2mol/L组各期细胞比例发生相应变化(P0.05);同时,10-6mol/L KIO3显著上调细胞内的cyclin D1(P0.05)和Ki67(P0.05)mRNA水平;而10-2mol/L KIO3显著下调细胞内的cyclin D1和Ki67 mRNA及蛋白水平(P0.05)。结论 KIO3影响SW579细胞增殖及周期可能与其对cyclin D1和Ki67的调节作用及剂量有关。     

Comparative immunohistochemical analysis of estrogen receptor and chromogranin-A reactivity in plurihormonal human prolactinomas

The aim of the study was to compare the immunoreactivity of estrogen receptors (ER) and chromogranin-A (CHR-A) in human prolactinomas with verified plurihormonality. Eleven cases of prolactinomas, nine found in women aged from 15-32 and two found in two men both aged 54 years, were analyzed for possible colocalization of other hormones produced by adenohypophysis, i.e. growth hormone (GH), thyroid-stimulating hormone (TSH), follicle-stimulating hormone (FSH) and adrenocorticotropic hormone (ACTH). All evaluated cases of prolactinomas were clinically manifested by elevated values of prolactin (PRL) in patient serum, while the values of other assayed hormones were within the normal range. Although biopsy material is not routinely submitted to immunohistochemical analysis for plurihormonality, these eleven cases of operated prolactinomas were randomly examined to the presence of plurihormonality. In six cases of prolactin-producing adenomas, the coexistence of growth hormone was detected. Colocalization of follicle-stimulating hormone and weak expression of adrenocorticotropic hormone were found in two cases each. Thus, bihormonal activity (PRL + GH) was found in six, and trihormonal activity (PRL + GH + FSH and PRL/GH + ACTH) in three cases of prolactinoma. In addition, the presence of prolactin and growth hormone was demonstrated in morphologically different cells. Eight of these eleven pituitary adenomas were tested for estrogen receptors (ER), which play an important role as growth stimulating factors and secretory factors for prolactin-producing cells. We tried to determine if there was a difference in the intensity of expression of estrogen receptors and chromogranin-A between pure prolactinomas and mixed, plurihormonal prolactinomas. By use of monoclonal antibodies, chromogranin-A found to be reactive in seven of eleven prolactinomas, i.e. in plurihormonal prolactinomas. Estrogen receptors were markedly expressed in all the eight prolactinomas analyzed, which may prove significant in the treatment of these hypophyseal tumors.