排序方式: 共有49条查询结果,搜索用时 15 毫秒
41.
42.
Adriana Kolesarova Shubhadeep Roychoudhury Bibiana Klinerova Dagmara Packova Katarina Michalcova Marek Halenar 《Journal of environmental science and health. Part. B》2019,54(6):533-537
Quercetin is a dietary bioflavonoid used widely as a food supplement and is generally recognized as safe. The aim of this in vitro study was to examine the steroid hormone (progesterone and 17- β estradiol) release, proliferation (PCNA and cyclin B1) and apoptosis (caspase 3 and p53) of porcine ovarian granulosa cells after the addition of quercetin at concentrations 0.01, 0.1, 1, 10 and 100?μmol?L?1. Progesterone release was stimulated at the concentration 10?μmol?L?1. Quercetin neither had any impact on 17-β estradiol secretion nor on the presence of PCNA. However, a significant enhancement of the occurrence of cyclin B1 was noted except for the lowest concentration 0.01?μmol?L?1. Quercetin did not have any influence on the number of granulosa cells containing caspase 3, but at the concentration 10?μmol?L?1 it inhibited p53 occurrence. Results confirm the safety of quercetin in porcine ovarian granulosa cell model and further suggest its possible concentration-dependent influence on ovarian functions through pathway that may involve progesterone, cyclin B1 and p53. 相似文献
43.
Assessment of biological effects of environmental pollution along the NW Mediterranean Sea using red mullets as sentinel organisms 总被引:2,自引:0,他引:2
Zorita I Ortiz-Zarragoitia M Apraiz I Cancio I Orbea A Soto M Marigómez I Cajaraville MP 《Environmental pollution (Barking, Essex : 1987)》2008,153(1):157-168
A biomonitoring program was carried out in spring and autumn in three pollution hot-spots and sensitive areas of the NW Mediterranean Sea using red mullets (Mullus barbatus) as sentinel organisms and a battery of biomarkers together with gonad histology. In fish from anthropogenic impacted areas (Fos-sur-mer, Cortiou, Arenzano, Delta of Ebro) lysosomal membrane destabilization occurred indicating disturbed health. There were no significant differences in metallothionein (MT) levels among stations. Peroxisomal acyl-CoA oxidase (AOX) activity was highest in fish from Cortiou. Both MT levels and AOX activities were significantly correlated with gamete development. Prevalence of melanomacrophage centers were high in Cortiou in all samplings and in Fos-sur-mer in September samplings. In conclusion, the application of a battery of biomarkers in red mullets provided relevant data for the assessment of environmental pollution in the NW Mediterranean Sea but also showed the difficulties of using native fish as sentinels. For future studies caging strategies are recommended. 相似文献
44.
Christian Sonne Jonathan Verreault Geir W. Gabrielsen Robert J. Letcher Pall S. Leifsson Tine Iburg 《毒物与环境化学》2013,95(9):1705-1713
The associations between blood organohalogen contaminant (OHC) concentrations and thyroid gland histology were studied in 10 adult female glaucous gulls (Larus hyperboreus) from the Norwegian Arctic (Bjørnøya) during the incubation period. This histological investigation was undertaken as previous glaucous gull studies from the same area reported negative relationships between circulating OHC concentrations and thyroid hormone levels. Organohalogen concentrations have previously been associated with altered blood plasma thyroid hormone concentrations, as a result of parenchymal thyroid gland alterations and perturbation of the hypothalamic-pituitary-thyroid (HPT)-axis. In this study, PCB (range: 186–1027 ng g?1ww), DDT (77–203 ng g?1ww) and chlordane (18–65 ng g?1ww) concentrations dominated the blood plasma OHC profile in incubating female glaucous gulls. High density of small follicles accompanied by follicular epithelial cell proliferations was seen in thyroid glands in seven of 10 gulls. Focal thyroiditis and nodular hyperplasia were found in two birds. No significant differences in plasma OHC concentrations were noted between gulls exhibiting high density of small follicles and cell proliferations and those birds not showing histological changes. Based on these findings, data suggest that the histological changes in thyroid glands of OHC-contaminated female glaucous gulls may be due to natural variance, although an OHC-induced thyroid stimulating hormone (TSH) perturbation resulting in epithelial cell hyperplasia and increased follicular density cannot be ruled out and remains to be verified. Hence, a large-scale histological study is required, in order to elaborate the potential linkage between changes in thyroid gland histology, OHC exposure and regulation of the HPT-axis in the Arctic-breeding glaucous gull. 相似文献
45.
46.
观察没食子酸丙酯(Propyl gallate,PG)对人慢性髓系白血病K562细胞株的增殖抑制及诱导凋亡作用.采用倒置显微镜观察细胞形态及数目的变化,乳酸脱氢酶(Lactate dehydrogenase,LDH)释放检测细胞活性,流式细胞术PI染色法及DNA倍体分析检测细胞凋亡作用.结果表明,没食子酸丙酯能有效地抑制K562细胞增殖,药物处理24 h时细胞形态发生变化,细胞数目减少;细胞培养液中LDH活性分析显示,20~300μg/mL没食子酸丙酯处理24 h对细胞毒性作用不明显;但处理时间达48 h时,没食子酸丙酯对细胞毒性明显增加;亚二倍体峰(凋亡峰)的出现及DNA片段化分析表明,200μg/mL PG处理细胞24 h时,能引起K562细胞凋亡.结果表明,PG具有明显的体外抗肿瘤活性,其抗癌活性与其抑制细胞增殖、诱导细胞凋亡有关.图5参18 相似文献
47.
为优化核桃试管苗生长条件,向核桃优良品种规模化栽培提供大量优良的种植材料,以‘香玲’核桃实生苗为材料,对基本培养基的类型(MS,DKW,WPM)和凝固剂种类(琼脂,Phytagel,二者结合)进行了筛选,并采用完全随机试验设计研究了细胞分裂素种类和浓度对其试管苗生长的影响.试验结果表明:基本培养基与凝固剂的种类,以及细胞分裂素的种类与浓度对芽苗生长的影响很大.以DKW为基本培养基,2.2 g/L Phytagel为凝固剂,激素配比为0.8 mg/L BA+0.01 mg/L IBA,有利于芽苗增殖,增殖可达4.70;后在0.8 mg/L KT+0.01 mg/L IBA进行壮苗,即可进行生根培养.不同基因型对基本培养基中无机盐成分的需求不同,含有较丰富矿物质的Phytagel有利于芽苗生长.BA促进腋芽的萌动和增殖,而KT则有利于壮苗.图4表3参22 相似文献
48.
49.
The discharge of organic waste from the petrochemical industry into the Mercier lagoons caused major groundwater contamination. The objective of this study was to determine the immunotoxic potential of three groundwater wells at increasing distance from the incinerator dumping site (1.17, 2.74 and 5.40 km). Rainbow Trout were exposed to increasing concentrations of water from three groundwater wells for 14 days. Immunocompetence was characterized by phagocytosis, mitogen-stimulated proliferation of lymphocytes, cell cycle analysis and apoptosis. A significant increase in innate (phagocytosis) and specific immune response (B lymphocyte proliferation) was observed in trout exposed to water collected from the well at 2.74 km. However, phagocytosis activity was suppressed in groups at 1.17 and 5.40 km. The proportion of lymphocytes in S phase was significantly increased in groups at 2.74 and 5.40 kin, while lymphocytes in G0/G1 phase were decreased in all three exposure groups. Additionally, dexamethasone (DEX)-induced apoptosis of lymphocytes was significantly reduced in the group at 2.74 km, which suggests decreased lymphocyte turnover. Furthermore, the ratio of DEX- induced apoptosis/apoptosis was lower in the groups at 2.74 and 5.40 km. In summary, our experiments have shown that exposure to the mixture of organic compounds present in Mercier groundwater modulates phagocytosis and cell proliferation, disrupts the cell cycle and reduces the ratio of DEX- induced apoptosis/apoptosis. It is concluded that groundwater collected in the vicinity of an incinerator containment field could impact immunocompetence in fish. 相似文献