A method was developed for the simultaneous determination of four kinds of estrogens （hexoestrol, diethylstilbestrol, estrone, and 17-beta-estradiol） in feed by gas chromatography-mass spectrometry （GC-MS）. After ...A method was developed for the simultaneous determination of four kinds of estrogens （hexoestrol, diethylstilbestrol, estrone, and 17-beta-estradiol） in feed by gas chromatography-mass spectrometry （GC-MS）. After the sample was extracted by ethyl ether and cleaned-up on HLB phase extraction column, four kinds of estrogens were derived and quantified in gas chromatographymass spectrometry. The results showed that the linear detectable ranged from 2.5 ng· mL-1 to 250 ng· mL-1for hexoestrol and from 5 ng· mL-1 to 500 ng· mL-1 for three other estrogens with the correlation coefficients （R2） were no less than 0.990. The recoveries were in the range of 76.34%-96.33% and the relative standard deviation was no more than 22.7%. The limits of quantitation （LOQ） for all analytics were between 10 ug· kg^-1 and 20 ug· kg^-1. The method was accurate and sensitive and could meet the actual requirements for the analyses of feed samples.展开更多
BACKGROUND: Biliary cancers are more common in females, and previous studies have suggested that Helicobacter pylori (H. pylori) exists in the biliary system. However, the effects of H. pylori infection and estrogen o...BACKGROUND: Biliary cancers are more common in females, and previous studies have suggested that Helicobacter pylori (H. pylori) exists in the biliary system. However, the effects of H. pylori infection and estrogen on the biological behaviors of human biliary epithelium mucosa remain unknown. The present study aimed to clarify their effects on the proliferation, apoptosis, migration and oxidative DNA damage of a human intrahepatic biliary epithelial cell (HIBEC) line in vitro. METHODS: HIBECs were co -cultured with 17 beta-estradiol (at 10(-9) mol/L, 10(-7) mol/L, and 10(-5) mol/L) and H. pylori (at MOI=0.5:1, 1:1, and 2:1) and continuously passaged until the 15th generation (approximately 45 days). Then, the following assays were performed. HIBEC proliferation was measured using the CCK-8 assay, plate clone-formation assay and by determining Ki-67 expression with immunocytochemistry; cell apoptosis and migration were investigated using Annexin-V/PI and transwell assays, respectively; and reactive oxygen species (ROS) and 8-hydroxy-2'-deoxyguanosine (8-OHdG) production were detected by flow cytometry and immunofluorescence staining combined with confocal laser scanning microscopy, respectively. The results were the basis for evaluating the level of oxidative stress and the related DNA damage in HIBECs. RESULTS: HIBECs maintained a normal morphology and vitality when treated with 17 beta-estradiol (at 10(-9) mol/L) and H. pylori (at MOI=0.5:1 and 1:1). 17 beta-estradiol at 10(-7) mol/L and 10(-5) mol/L and H. pylori at MOI=2:1, by contrast, caused cell death. Compared with controls, HIBECs treated with 17 beta-estradiol (10(-9) mol/L) and H. pylori (MOI=1:1) had a higher up-regulation of proliferation, Ki-67 expression, clone formation, migration activity and the expression of ROS and 8-OHdG and exhibited a down-regulation of apoptosis. The above effects were further increased when 17 beta-estradiol and H. pylori were combined (P<0.05). CONCLUSIONS: H. pylori and 17 beta-estradiol, separately or in combination, promoted cell proliferation and suppressed apoptosis of HIBECs in vitro. The above phenomena might be related to oxidative stress and its subsequent DNA damage with H. pylori and 17 beta-estradiol.展开更多
目的:进一步验证雌激素在骨髓间充质干细胞(BMSC)分化为子宫内膜异位症(EMT)病灶过程中的作用。方法:原代培养BMSC后进行流式细胞分析鉴定,建立小鼠EMT模型并将内异病灶进行HE染色鉴定。将小鼠BMSC经尾静脉注射EMT模型小鼠内,按BMSC是...目的:进一步验证雌激素在骨髓间充质干细胞(BMSC)分化为子宫内膜异位症(EMT)病灶过程中的作用。方法:原代培养BMSC后进行流式细胞分析鉴定,建立小鼠EMT模型并将内异病灶进行HE染色鉴定。将小鼠BMSC经尾静脉注射EMT模型小鼠内,按BMSC是否预处理分为无17β-雌二醇预处理组(对照组)和17β-雌二醇预处理组(预处理组)。1月后EMT病灶切片免疫荧光检测子宫内膜间质细胞(ESC)的B淋巴细胞瘤-2(BCL-2)、增殖细胞核抗原(PCNA)、基质金属蛋白酶-1(MMP-1)蛋白表达差异。结果:小鼠模型EMT病灶HE染色提示建立模型成功。免疫荧光结果发现:预处理组的异位病灶BCL-2的平均积分光密度值高于对照组(56.58±7.07 vs 3.34±0.29),预处理组的异位病灶PCNA的平均积分光密度值高于对照组(83.64±13.07 vs 5.23±0.51),预处理组的异位病灶MMP-1蛋白的平均积分光密度值高于对照组(40.26±7.79 vs 7.64±3.62),差异均有统计学意义(P<0.05)。结论:本实验初步证实17β-雌二醇可能通过促进BMSC迁移、分化,最终促进异位病灶ESC的分化、增殖并减少凋亡,从而增加异位病灶的病变程度。展开更多
基金Supported by Fund of Harbin Provincial Education Department(2014AB3BN041)
文摘A method was developed for the simultaneous determination of four kinds of estrogens （hexoestrol, diethylstilbestrol, estrone, and 17-beta-estradiol） in feed by gas chromatography-mass spectrometry （GC-MS）. After the sample was extracted by ethyl ether and cleaned-up on HLB phase extraction column, four kinds of estrogens were derived and quantified in gas chromatographymass spectrometry. The results showed that the linear detectable ranged from 2.5 ng· mL-1 to 250 ng· mL-1for hexoestrol and from 5 ng· mL-1 to 500 ng· mL-1 for three other estrogens with the correlation coefficients （R2） were no less than 0.990. The recoveries were in the range of 76.34%-96.33% and the relative standard deviation was no more than 22.7%. The limits of quantitation （LOQ） for all analytics were between 10 ug· kg^-1 and 20 ug· kg^-1. The method was accurate and sensitive and could meet the actual requirements for the analyses of feed samples.
基金supported by grant from the National Natural Science Foundation of China(81401932)
文摘BACKGROUND: Biliary cancers are more common in females, and previous studies have suggested that Helicobacter pylori (H. pylori) exists in the biliary system. However, the effects of H. pylori infection and estrogen on the biological behaviors of human biliary epithelium mucosa remain unknown. The present study aimed to clarify their effects on the proliferation, apoptosis, migration and oxidative DNA damage of a human intrahepatic biliary epithelial cell (HIBEC) line in vitro. METHODS: HIBECs were co -cultured with 17 beta-estradiol (at 10(-9) mol/L, 10(-7) mol/L, and 10(-5) mol/L) and H. pylori (at MOI=0.5:1, 1:1, and 2:1) and continuously passaged until the 15th generation (approximately 45 days). Then, the following assays were performed. HIBEC proliferation was measured using the CCK-8 assay, plate clone-formation assay and by determining Ki-67 expression with immunocytochemistry; cell apoptosis and migration were investigated using Annexin-V/PI and transwell assays, respectively; and reactive oxygen species (ROS) and 8-hydroxy-2'-deoxyguanosine (8-OHdG) production were detected by flow cytometry and immunofluorescence staining combined with confocal laser scanning microscopy, respectively. The results were the basis for evaluating the level of oxidative stress and the related DNA damage in HIBECs. RESULTS: HIBECs maintained a normal morphology and vitality when treated with 17 beta-estradiol (at 10(-9) mol/L) and H. pylori (at MOI=0.5:1 and 1:1). 17 beta-estradiol at 10(-7) mol/L and 10(-5) mol/L and H. pylori at MOI=2:1, by contrast, caused cell death. Compared with controls, HIBECs treated with 17 beta-estradiol (10(-9) mol/L) and H. pylori (MOI=1:1) had a higher up-regulation of proliferation, Ki-67 expression, clone formation, migration activity and the expression of ROS and 8-OHdG and exhibited a down-regulation of apoptosis. The above effects were further increased when 17 beta-estradiol and H. pylori were combined (P<0.05). CONCLUSIONS: H. pylori and 17 beta-estradiol, separately or in combination, promoted cell proliferation and suppressed apoptosis of HIBECs in vitro. The above phenomena might be related to oxidative stress and its subsequent DNA damage with H. pylori and 17 beta-estradiol.
文摘目的:进一步验证雌激素在骨髓间充质干细胞(BMSC)分化为子宫内膜异位症(EMT)病灶过程中的作用。方法:原代培养BMSC后进行流式细胞分析鉴定,建立小鼠EMT模型并将内异病灶进行HE染色鉴定。将小鼠BMSC经尾静脉注射EMT模型小鼠内,按BMSC是否预处理分为无17β-雌二醇预处理组(对照组)和17β-雌二醇预处理组(预处理组)。1月后EMT病灶切片免疫荧光检测子宫内膜间质细胞(ESC)的B淋巴细胞瘤-2(BCL-2)、增殖细胞核抗原(PCNA)、基质金属蛋白酶-1(MMP-1)蛋白表达差异。结果:小鼠模型EMT病灶HE染色提示建立模型成功。免疫荧光结果发现:预处理组的异位病灶BCL-2的平均积分光密度值高于对照组(56.58±7.07 vs 3.34±0.29),预处理组的异位病灶PCNA的平均积分光密度值高于对照组(83.64±13.07 vs 5.23±0.51),预处理组的异位病灶MMP-1蛋白的平均积分光密度值高于对照组(40.26±7.79 vs 7.64±3.62),差异均有统计学意义(P<0.05)。结论:本实验初步证实17β-雌二醇可能通过促进BMSC迁移、分化,最终促进异位病灶ESC的分化、增殖并减少凋亡,从而增加异位病灶的病变程度。
