排序方式： 共有72条查询结果，搜索用时 15 毫秒
51.
52.
Il-Chan Kim Young Ja Kim Yong-Dal Yoon Shoji Kawamura Yong-Sung Lee Jae-Seong Lee 《Marine environmental research》2004,58(2-5):125
To use two small fish Rivulus marmoratus (Cyprinodontiformes, Rivulidae) and the Japanese medaka Oryzias latipes (Belloniformes) as testing models in molecular ecotoxicology, we have cloned the cytochrome P450 1A (CYP1A) gene after screening of both genomic DNA libraries, and sequenced 11,863 and 7,243 bp including all the exons and introns with promoter regions, respectively. The Rivulus and the medaka CYP1A gene consisted of seven exons (including non-coding exons) with high homology to mammals. In the promoter region, Rivulus CYP1A gene has seven xenobiotic response elements (XREs) and two metal response elements (MREs), while the Japanese medaka CYP1A gene has six XREs and four MREs. Interestingly, medaka CYP1A gene has a number of MREs at the promoter, which may affect its response on metal exposure. We describe here the gene structure of both fish CYP1A genes. 相似文献
53.
从许氏平鲉脑组织中克隆到细胞色素P450芳香化酶(P450aromB)(CYP19B)基因核心功能区cDNA。结果表明,许氏平鲉CYP19B主要功能区片段编码369个氨基酸,包括I-螺旋区、Ozol’s肽区及部分芳香化酶特异性保守区。RT-PCR分析表明,CYP19B在雌鱼和雄鱼各组织中表达情况不同,在雌鱼中表达较丰富,但是两者都在性腺和脑中有表达,且脑中的表达量高于性腺。生殖季节表达结果表明,CYP19B在繁殖前期表达较为丰富,退化期未见有表达。CYP19B在精巢处于Ⅲ期的许氏平鲉脑组织中表达最为丰富,在精巢发育Ⅳ期的脑组织表达量最低。上述研究结果说明,CYP19B在雌性和雄性许氏平鲉繁殖周期中均发挥重要生理作用。 相似文献
54.
黄芩苷在中国对虾体内对诺氟沙星消除及细胞色素P450 酶的影响 总被引：1，自引：0，他引：1
对照组中国对虾(Fenneropenaeus chinensis)连续投喂不含药物饵料,诺氟沙星组和联合用药组以50 mg/kg体质量剂量连续投喂含诺氟沙星药饵5 d后,诺氟沙星组投喂不含药物饵料10 d,联合用药组以100 mg/kg体质量剂量投喂含黄芩苷饵料10 d。从投喂诺氟沙星药饵时开始,在不同时间点采集中国对虾血液、肝胰腺、鳃和肌肉组织进行药物残留和肝药酶活性测定。结果表明:与诺氟沙星组相比,联合用药组各组织中诺氟沙星消除较快,血淋巴、肝胰腺、鳃和肌肉的理论休药期比诺氟沙星组分别缩短了23.92%、22.73%、25.92%和21.92%;与对照组相比,诺氟沙星对中国对虾CYP1A(ECOD)和CYP2(APND)酶活性有一定的抑制作用,但随着诺氟沙星的消除抑制作用逐渐减弱,最后恢复至对照水平;黄芩苷在加速诺氟沙星在中国对虾体内消除的同时,对中国对虾CYP450酶也有较强的诱导作用。因此,药物使用应注意药物之间的相互作用,以免造成药物中毒或疗效下降现象。 相似文献
55.
Mark A. Ricca A. Keith Miles James L. Bodkin Kimberly A. Trust 《Marine pollution bulletin》2010,60(6):861-872
Exposure to contaminants other than petroleum hydrocarbons could confound interpretation of Exxon Valdez oil spill effects on biota at Prince William Sound, Alaska. Hence, we investigated polychlorinated biphenyls (PCBs) in blood of sea otters and harlequin ducks sampled during 1998. PCB concentrations characterized by lower chlorinated congeners were highest in sea otters from the unoiled area, whereas concentrations were similar among harlequin ducks from the oiled and unoiled area. Blood enzymes often elevated by xenobiotics were not related to PCB concentrations in sea otters. Only sea otters from the unoiled area had estimated risk from PCBs, and PCB composition or concentrations did not correspond to reported lower measures of population performance in sea otters or harlequin ducks from the oiled area. PCBs probably did not influence limited sea otter or harlequin duck recovery in the oiled area a decade after the spill. 相似文献
56.
J. W. Anderson J. M. Jones S. Steinert B. Sanders J. Means D. McMillin T. Vu R. Tukey 《Marine environmental research》1999,48(4-5)
In 1993 collections of marine mussels (Mytilus galloprovincialis) were deployed 1 m from the water surface at six sites in San Diego Bay for 88 days. A similar mussel deployment was conducted in 1995, except the animals were deployed 1 m off the bottom and only for 32 days. After recovery from the sites, tissue was extracted with dichloromethane and the solvent extracts analyzed for chemical contaminant content and the ability to produce CYP1A1 induction in a transgenic cell line (TV101L cells). The cells used in the assay (P450 RGS) are stably transfected with a plasmid containing firefly luciferase linked to human CYP1A1 promoter sequences. Induction (fold increase compared to control) was determined by luminometry 16 h after application of small volumes (2–10 μl) of solvent extracts to cultured cells. Small mussels deployed in the Naval Station (NAV) in 1993 exhibited very high bioaccumulation of polycyclic aromatic hydrocarbons (PAHs; 52 μg/g) and polychlorinated biphenyls (PCBs), in addition to very strong induction of CYP1A1 measured by reporter gene system (RGS) responses. Large mussels deployed at the NAV station in 1993 and intermediate-sized animals placed at three stations within the NAV station in 1995 accumulated 13–29 μg PAH/g and exhibited relatively high RGS responses. Correlation of RGS responses for all mussel samples to the measured PAH concentrations was 0.85 (r2). When the concentrations of seven specific PAHs found in the samples are converted to benzo[a]pyrene equivalents, from previously derived toxic equivalency factors (TEFs) for this test system, and compared to measured RGS responses, the correlations are approximately 0.9. The results of these studies indicate that the RGS biomarker can be used as a screening tool for detection of CYP1A1-inducing compounds in tissues, and an estimate of potential human health or ecological risk from ingestion of contaminated organisms. Positive RGS responses can be followed by detailed chemical analyses of PAHs and coplanar PCBs using the same extract. 相似文献
57.
58.
大黄鱼(Pseudosciaena crocea)细胞色素P450 CYP4F7基因的克隆及表达分析 总被引：1，自引：0，他引：1
CYP4F7是细胞色素P450超基因家族中CYP4F亚家族中的同工酶之一,而细胞色素P450在通过电子传递参与生物体代谢和转化内源和外源化合物方面起着重要的作用。以本实验室构建的大黄鱼消减杂交cDNA文库中623bp的CYP4F7片段设计引物,以大黄鱼的总RNA为模板,利用RACE-PCR的方法,克隆鉴定出了大黄鱼细胞色素P450 CYP4F7基因。结果表明:基因全长1934bp,5'端非编码区59bp,3'端非编码区264bp,开放阅读框1611bp,编码536个氨基酸。序列分析表明大黄鱼的CYP4F7氨基酸序列与舌齿鲈的相似性为91%。利用RT-PCR方法研究CYP4F7在大黄鱼各组织中的表达特征,结果表明CYP4F7在肝脏、脾脏中表达量最高,在心脏、肾脏、头肾、鳃丝中表达量次之。另外,CYP4F7在注射了细菌脂多糖的大黄鱼各组织中的表达量均低于正常的大黄鱼,认为细菌脂多糖可能是CYP4F7表达的抑制剂,说明CYP4F7可能与鱼类免疫反应有一定相关性。 相似文献
59.
喹诺酮类药物对牙鲆肝药物代谢酶活性的影响 总被引：5，自引：1，他引：4
以牙鲆(Paralichthys olivaceus)为研究对象,通过观察水产用的3种喹诺酮类药物(FQ)恩诺沙星、诺氟沙星和氟甲喹分别对牙鲆肝组织中氨基比林N-脱甲基酶(AND)、红霉素N-脱甲基酶(ERND)和7-乙氧基异吩唑酮-脱乙基酶(EROD)活性的影响,探讨喹诺酮类药物对牙鲆肝药物代谢酶(细胞色素P-450)活性影响的差异.结果表明,与对照组比较,三组喹诺酮类药物对牙鲆肝S_9中AMND、ERND、EROD酶活性均具有抑制作用,其中恩诺沙星和诺氟沙星组中,3种酶的活性极显著下降(P＜0.01),而对于氟甲喹组而言,AMND、ERND酶活性显著下降(P＜0.05),EROD酶活性极显著下降(P＜0.01). 相似文献
60.
Miao Liu Haishen Wen Feng He Jifang Li Dan Shi Jian Hu Yuanqing Zhang Ruiqin Ma Weijie Mu Baoxia Qi 《中国海洋大学学报(英文版)》2011,10(4):409-416