micronucleus assay

微核测定
  • 文章类型: Journal Article
    在过去的几十年里,微核试验已被认为是监测暴露于许多不同职业因素的人群的合适生物标志物,生活方式,环境条件,辐射暴露,和农药的有害影响。这项工作的目的是指导未来实地研究的设计,以评估儿童暴露于环境诱变剂的风险。辐射,和杀虫剂。这篇评论寻求有关儿童口腔细胞微核分析的可用信息。研究DNA损伤的文献搜索,遗传损伤,口腔细胞,口腔细胞,遗传毒性,诱变和微核始于2000年,计划于5月结束,2022年。简而言之,搜索PubMed,MEDLINE,和谷歌学者为各种文章进行了表演。结果表明,针对暴露于最多样化环境条件的儿童口腔细胞微核的研究仍然很少。只有环境污染与儿童口腔细胞基因组的损害有关。因此,研究人员需要在细胞分析中进行校准,实地研究方案的标准化以及使用微核试验作为儿童生物监测工具对儿童进行评估的新研究的发展。
    In the last decades, the micronucleus assay has been recognized as a suitable biomarker for monitoring populations exposed to many different occupational factors, lifestyle, environmental conditions, radiation exposure, and deleterious effects of pesticides. The objective of this work is to direct the design of future field studies in the assessment of the risk of children exposed to environmental mutagens, radiation, and pesticides. This review sought available information on the analysis of micronuclei in oral cells in children. A literature search for papers investigating DNA damage, genetic damage, oral cells, buccal cells, genotoxicity, mutagenicity and micronucleus was begun in 2000 and is scheduled to be concluded in May, 2022. Briefly, a search of PubMed, MEDLINE, and Google Scholar for a variety of articles was performed. The results showed that there are still few studies that addressed micronuclei of oral cells in children exposed to the most diverse environmental conditions. Only environmental pollution was associated with damage to the genome of oral cells in children. Therefore, researchers need to be calibrated in cell analysis, standardization of field study protocols and the development of new research in the evaluation of children using the micronucleus test as a tool in child biomonitoring.
    导出

    更多引用

    收藏

    翻译标题摘要

    我要上传

    求助全文

  • 文章类型: Journal Article
    经济合作与发展组织(OECD)批准了鉴定基因毒性化学物质的测试指南(TG)。如转基因啮齿动物基因突变测定(TG488)。当前的OECDTG不包括精子DNA损伤的测定,从而导致关键的测试差距。我们评估了精子染色质结构测定(SCSA)和末端脱氧核苷酸转移酶介导的三磷酸脱氧尿苷尼克末端标记(TUNEL)测定的性能,以检测推荐的TG488方案中的精子DNA损伤。MutaMouse雄性接受0、0.5、1或2mg/kg/天的三乙胺(TEM),多官能烷化剂,口服28天,2天(血液)和3天(精子和骨髓)后收集组织。TEM显着增加了骨髓中lacZ突变体的频率,网织红细胞(%MN-RET)和正常染色红细胞(%MN-NCE)中的微核(MN)呈剂量依赖性(P<0.05)。DNA片段化指数(%DFI)和%TUNEL阳性细胞在精子中表现出剂量相关的增加(P<0.05),两种检测结果呈强相关(R=0.9298)。在同一只动物中,在%MN-NCE和%DFI之间观察到良好的相关性(R=0.7189)。最后,基准剂量建模(BMD)在体细胞和生殖细胞测定中显示出可比的BMD10值。我们的结果表明,精子DNA损伤测定可以很容易地整合到OECD标准设计中,研究体细胞组织的遗传毒性,以提供有关化学物质在生殖细胞中是否具有遗传毒性并影响其风险评估的关键信息。
    The Organisation for Economic Co-operation and Development (OECD) endorses test guidelines (TG) for identifying chemicals that are genotoxic, such as the transgenic rodent gene mutation assay (TG 488). Current OECD TG do not include assays for sperm DNA damage resulting in a critical testing gap. We evaluated the performance of the Sperm Chromatin Structure Assay (SCSA) and the Terminal Deoxynucleotidyl Transferase-Mediated Deoxyuridine Triphosphate Nick end Labeling (TUNEL) assay to detect sperm DNA damage within the recommended TG 488 protocol. MutaMouse males received 0, 0.5, 1, or 2 mg/kg/day triethylenemelamine (TEM), a multifunctional alkylating agent, for 28 days orally and tissues were collected two (blood) and three (sperm and bone marrow) days later. TEM significantly increased the frequency of lacZ mutants in bone marrow, and of micronuclei (MN) in both reticulocytes (%MN-RET) and normochromatic erythrocytes (%MN-NCE) in a dose-dependent manner (P < 0.05). The percentage of DNA fragmentation index (%DFI) and %TUNEL positive cells demonstrated dose-related increases in sperm (P < 0.05), and the two assay results were strongly correlated (R = 0.9298). Within the same animal, a good correlation was observed between %MN-NCE and %DFI (R = 0.7189). Finally, benchmark dose modelling (BMD) showed comparable BMD10 values among the somatic and germ cell assays. Our results suggest that sperm DNA damage assays can be easily integrated into standard OECD designs investigating genotoxicity in somatic tissues to provide key information on whether a chemical is genotoxic in germ cells and impact its risk assessment.
    导出

    更多引用

    收藏

    翻译标题摘要

    我要上传

    求助全文

公众号