由于环境因素和细胞内的正常代谢过程造成的DNA损伤,每个细胞每天都会发生1,000到1,000,000个。虽然这些只占人类基因组约60亿个碱基中的一小部分,但如果关键基因损伤未及时修复,可能会阻碍细胞的正常生理功能,进而增加癌变可能。彗星实验,或称单细胞凝胶电泳(Single cell gel electrophoresis,SCGE),是一种测量单个细胞DNA损伤的常用技术。其原理很简单,即在电泳场中,将受损细胞DNA(包含片段和链断裂)与完整的DNA分离,通过显微镜可观察到损伤细胞呈现出典型的彗星状尾巴,然后通过测量计算彗尾大小对比出细胞DNA损伤的程度。因为彗星实验的特点,该方法几乎被用来评估任何类型的真核细胞的 DNA 修复能力,包括双、单链断裂的不同的 DNA 损伤情况。是一种能快速、大通量检测真核细胞DNA损伤进而判别遗传毒性的技术。
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彗星实验结果图
彗星实验原理虽简单,但操作繁琐,需要丰富的实验经验和技巧,尤其常常出现的“脱胶”问题,困扰了许多科研人员。除此之外,有时为了跑出完美的“彗星”图案放在paper里,还需要重复做许多次实验,费时费力。为了解决上述问题,我们推荐CellBiolabs的OxiSelectTMComet Assay Kit即彗星实验试剂盒来检测细胞的DNA损伤。该试剂盒不仅能让彗星实验化繁为简,还有两种不同规格(3孔和96孔)的细胞电泳凝胶板供选择,让少量样本和大量样本的DNA损伤检测通通轻松hold住。用该试剂盒做彗星实验流程如下图。
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除了操作简便,OxiSelectTMComet Assay Kit还有以下优点:
1) 适用于各种DNA损伤检测,是一款非常好用的DNA损伤检测筛选工具;
2) 试剂盒中的载玻片经过特殊处理以粘附低熔点琼脂糖,避免“脱胶”问题出现;
3) 采用特殊的DNA荧光染料,能有效降低背景干扰,更加方便读取实验结果。
彗星实验试剂盒信息:
品名
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货号
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规格
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说明
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OxiSelectTM Comet Assay Kit (3-Well Slides)
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STA-350
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15 assays
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试剂盒内有5张3孔载玻片和彗星实验所需的低熔点琼脂糖、裂解液及DNA荧光染料等,共可检测15个样品。
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OxiSelectTM Comet Assay Kit (3-Well Slides)
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STA-351
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75 assays
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试剂盒内有25张3孔载玻片和彗星实验所需的低熔点琼脂糖、裂解液及DNA荧光染料等,共可检测75个样品。
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OxiSelectTM Comet Assay Kit (96-Well Slides)
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STA-355
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96 assays
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试剂盒内有1张96孔载玻片和彗星实验所需的低熔点琼脂糖、裂解液及DNA荧光染料等,共可检测96个样品。
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为了满足客户更多样的实验需求,彗星实验试剂盒内特殊处理电泳载玻片还可以单独购买,详情如下:
品名
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货号
|
规格
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产品图片
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Comet Assay Slides, 3-Well
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STA-352
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5 slides
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STA-353
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25 slides
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Comet Assay Slides, 96-Well
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STA-356
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1 slides
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STA-356-5
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5 slides
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- Liu, Z. et al. (2016). Canonical microRNAs enable differentiation, protect against DNA damage, and promote cholesterol biosynthesis in neural stem cells. Stem Cells and Dev. doi:10.1089/scd.2016.0259.
- Dai, C. et al. (2016). Curcumin ameliorates furazolidone-induced DNA damage and apoptosis in human hepatocyte L02 cells by inhibiting ROS production and mitochondrial pathway. Molecules. 21:1061.
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- Zhang, J. et al. (2016). Inhibition of Glucose-6-Phosphate Dehydrogenase could Enhance 1, 4-Benzoquinone-induced Oxidative Damage in K562 Cells. Oxid Med Cell Longev. doi:10.1155/2016/3912515.
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- Zhao, X. et al. (2016). Dioscin induces apoptosis in human cervical carcinoma HeLa and SiHa cells through ROS-mediated DNA damage and the mitochondrial signaling pathway. Molecules. doi:10.3390/molecules21060730.
- Chen, X. et al. (2016). Zidovudine, abacavir and lamivudine increase the radiosensitivity of human esophageal squamous cancer cell lines. Oncol Rep. 36:239-246.
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- Cui, F. M. et al. (2016). The role of miR-34a in tritiated water toxicity in human umbilical vein endothelial cells. Dose-Response. doi:10.1177/1559325816638585.
- Laks, D. R. et al. (2016). Inhibition of nucleotide synthesis targets brain tumor stem cells in a subset of glioblastoma. Mol Cancer Ther. doi:10.1158/1535-7163.MCT-15-0982.
- Abubakar, I. B. et al. (2016). Synergistic cytotoxic effects of combined δ-tocotrienol and jerantinine B on human brain and colon cancers. J Ethnopharmacol. doi:10.1016/j.jep.2016.03.004.
- Hofstetter, C. et al. (2016). Inhibition of KDM6 activity during murine ESC differentiation induces DNA damage.J Cell Sci. 129:788-803.
- Si, L. et al. (2016). Dioscin suppresses human laryngeal cancer cells growth via induction of cell-cycle arrest and MAPK-mediated mitochondrial-derived apoptosis and inhibition of tumor invasion. Eur J Pharmacol. doi:10.1016/j.ejphar.2016.02.009.
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bio-equip.com
北京西美杰科技有限公司(Beijing XMJ Scientific Co.,Ltd,以下简称西美杰)于2006年成立,由留美归国生物领域专业人士创办。西美杰坚持自己的经营理念,勤奋踏实地整合全球产品资源与技术资源,为高校、科研院所的科研工作者以及生物制品生产企业提供一站式产品服务方案,帮助科研及企业单位缩短科研时间、节约科研成本、提升科研水平、增强企业市场竞争力。
西美杰以其开放、进取、诚信、专业等优势与国外多家试剂、原料和技术供应商建立了长期稳定的合作伙伴关系,成为了众多国际厂商的中国区总代理、一级代理和中国唯一授权代表处。更与药用辅料生产商长期战略性合作,共同开展制药辅料的进口注册与市场开拓。
业务的迅猛发展促进了西美杰内部组织架构的不断优化,针对科研客户与企业客户的不同需求,西美杰建立了科研与工业两支独立的营销团队,分别配备专业的技术支持和客服人员,力求为不同类型的客户提供前沿专业的解决方案以及产品与高效的服务。
经过十多年的发展,西美杰得到了众多客户的支持与信赖,在业务上实现了迅猛发展,以专业的服务成为多家跨国企业中国区研发与生产基地、制药企业与诊断企业以及中科院系统、军科院系统、医科院系统、清华大学、北京大学、北大医学部、首都医科大学等高校与科研院所采购平台的指定供货商。
一、西美杰主营产品线与代理品牌
1. 免疫学:二抗和底物生产商KPL的中国代理;著名抗体生产商Lifespan,Abnova,Cali-Bio,MBL,SAB等近10个品牌的中国一级代理。
2. 分子与细胞生物学:基因库生产商Source Bioscience、德国生化试剂Panreac-AppliChem、德国核苷酸原料品牌Jena Bioscience、外泌体分离专家101Bio等中国总代理;氧化应激检测专业品牌Cell Biolabs、转染试剂专家 Mirus、动物免注射给药工具Alzet等中国总代理或一级代理。
3. 植物学:美国组培试剂品牌Phytotech中国总代理;植物抗体生产商Agrisera、组培抗菌剂专利产品PPM供应商PCT中国一级代理。
4. 蛋白结构学:特色蛋白结晶试剂与耗材Jena Bioscience、Hampton、Anatrace、MiTeGen。
5. 药物筛选开发:检测集团Eurofins的药物筛选服务与产品中国一级代理。
6. 生物制药:覆盖制药从上游到下游环节,全球药用辅料供应商Pfanstiehl(全球重磅生物药中7个药物的辅料供应商)、细胞营养添加物KERRY(全球10大重磅生物药中7个药物的原料供应商)、欧洲制药生化原料供应商Panreac-AppliChem、无抗生素原核表达系统Delphi以及CHO细胞系合约开发PanGen等品牌中国总代理,以及HCP/Prot A/BSA残留检测试剂盒生产商Cygnus等中国制药领域代理。
7. 诊断原料:二抗和底物生产商KPL以及自身免疫抗原抗体生产商Arotec中国总代理,以及免疫诊断原料供应商Meridian和Fitzgerald。
二、西美杰主营产品领域与服务
1. 科研/研发产品及服务项目
研究领域上:覆盖生物化学、细胞生物学、免疫学、蛋白组学、植物学、分子生物学、药物筛选;
研究对象上:覆盖人类、动物与模式动物、植物等物种;
产品结构上:从基因到蛋白质结构与in vivo/in vitro功能的分析和研究;
产品种类上:从试剂到特殊工具和耗材。
2. 生物工业生产原料、药用辅料
覆盖培养基生产、生物制药/疫苗生产细胞营养、无抗生素筛选原核表达系统、HCP/Prot A/BSA残留检测试剂盒、检测抗原/抗体/底物/BSA、诊断工业原料。
3. 技术服务、合约开发与技术转让
稳定表达CHO细胞株的构建与工艺开发;
培养基优化;
多肽合成、抗体定制、病毒包装等;
药物功能筛选服务KinaseProfiler™等。
4. 代理进口服务
西美杰拥有自主进出口资质,和自有国际物流运输系统,为中国众多大型科研机构提供免税科研仪器和试剂的代理进口服务,我们乐意为客户代理进口在中国没有销售代理的来自全世界的产品。
西美杰将继续秉承诚信、专业经营之风,整合全球优势产品资源、技术资源和我公司的服务资源,为高校、科研院所的科研工作者以及生物制品生产企业提供一站式的服务。