MTT cell proliferation assay kit, 1000 reactions. Kit content: Solution A 10ml, Solution B 100ml. MTT Proliferation Assay Kit provides an easy to use tool for studying the induction and inhibition of cell proliferation in any in vitro model. This kit will also allow investigators to screen drug candidates involved in cell cycle regulation. In this assay, MTT is taken up by cells through the plasma membrane potential and then reduced to formazan by intracellular NAD(P)H-oxidoreductases
MTT Cell Proliferation Assay Kit
Catalog Number:
CP-001, 500 reactions
CP-002, 1000 reactions
Introduction
The reduction of tetrazolium salts is now recognized as a safe, accurate alternative to radiometric testing.MTT [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide] assay, first described by Mosmann in 1983, is based on the ability of a mitochondrial dehydrogenase enzyme from viable cells to cleave the tetrazolium rings of the pale yellow MTT and form a dark blue formazan crystals which is largely impermeable to cell membranes, thus resulting in its accumulation within healthy cells. Solubilization of the cells by the addition of a detergent results in the liberation of the crystals which are solubilized.The number of surviving cells is directly proportional to the level of the formazan product created. The color can then be quantified using a simple colorimetric assay. The results can be read on a multi-well scanning spectrophotometer (ELISA reader).
Storage:
Upon receiving, Solution AMTT solution should be kept at-200C and protected from light.Store properly, the kit components should remain stable for 6 months.
Kit Contents:
1.Solution AMTT solution: 5ml ( 500 reactions), 10ml (1000 reactions)
2. Solution BCrystal dissolving solutions: 50ml ( 500 reactions), 100ml (1000 reactions)
Protocol
1. Plate cells in 96-well tissue culture plate at density of 2x105 per well in 100ul of culture medium.
2. 5 hours before the end of the incubation add 10ul of MTT solution from step one to each well containing cells.
3. Incubate the plate at 37ºC for 5 hours.
4. Remove media with needle and syringe.
5. Add 100ul of Solution B to each well and pipette up and down to dissolve crystals.
6. Transfer to plate reader and measure absorbance at 570nm.
Reference Mosmann T. Rapid colorimetric assay for cellular growth and survival: application to proliferation and cytotoxicity assays. J Immunol Methods. 1983 Dec 16;65(1-2):55-63.
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伊立替康是喜树碱的半合成衍生物。喜树碱可特异性地与拓扑异构酶I结合，后者诱导可逆性单链断裂，从而使DNA双链结构解旋；伊立替康及其活性代谢物SN－38可与拓扑异构酶I－DNA复合物结合，从而阻止断裂单链的再连接。现有研究提示，伊立替康的细胞毒作用归因于DNA合成过程中，复制酶与拓扑异构酶I－DNA一伊立替康（或SN－38）三联复合物相互作用，从而引起DNA双链断裂。哺乳动物细胞不能有效地修复这种DNA双链断裂。
毒理研究
遗传毒性：伊立替康和SN－38在Ames试验中均未显示出致突变性。伊立替康在CHO细胞染色体畸变试验和小鼠微核试验中显示了致断裂作用。
生殖毒性：在啮齿动物多次给药试验中，可见雄性动物生殖器官萎缩。雌性大鼠静脉注射14C一伊立替康，其放射性可透过胎盘屏障，大鼠和家兔试验中，可见本品对胚胎和胎儿的毒性反应。大鼠静脉注射放射性标记的伊立替康后5分钟内，可在其乳汁中检测到放射性，给药4小时后乳汁中药物浓度可达到血药浓度的65倍；雌性大鼠在围产期静脉注射本品可引起仔鼠学习能力和雌鼠仔鼠体重的下降。
尚无足够的和严格控制的孕妇临床研究资料，若患者在孕期使用本品或在使用本品期间怀孕，应被告之对胎儿的潜在危害。有生育可能的妇女在本品给药期间应避免怀孕；母亲在接受本品治疗期间应停止哺乳。
致癌性：尚未进行伊立替康长期给药的致癌性研究，但进行了大鼠连续三周、每周一次静脉注射伊立替康2mg/kg和25mg/kg，然后恢复91周的试验（大鼠静脉注射伊立替康25mg/kg后，其Cmax和AUC分别约相当于人每周给药125mg/m2后的7倍和1.3倍）,结果显示，子宫喇叭口处子宫内膜间质息肉和子宫内膜间质肉瘤发生率的增加有明显的剂量依赖性。
【药代动力学】
文献报导，人体静脉注射本品后，伊立替康的血浆浓度呈常指数消除。平均消除半衰期为6～12小时，活性代谢产物SN－3 8的消除半衰期为10～20小时。因为其内酯和羟基酸是化学平衡的，故活性内酯和SN－38的半衰期与完整的伊立替康和SN－38的半衰期相近。
在50～350mg/m2的剂量范围内，伊立替康吸收面积（AUC）与剂量呈线性递增关系：SN－38的AUC增加要小于剂量的增加。在90分钟内静脉滴注本品后1小时内，活性代谢产物SN－38达到最大浓度。伊立替康与血浆蛋白的结合率为 30%～68%，明显低于SN－38与血浆蛋白的结合率（大约95%）。伊立替康主要在肝内由羧酸酯酶转化为活性代谢产物SN－38，后者代谢为葡萄糖甙酸，活性为SN－38的1/50～1/100（由体内细胞毒性检测）。体内分布不明；药物及代谢产物经尿排泄：伊立替康为11%～20%，SN－38<1%，SN－38糖甙约3%。给药48小时后胆汁蓄积和经尿排泄的药25%～50%。
【贮 藏】
遮光，密闭保存。
【包 装】
西林瓶装，1瓶/盒，有40mg及100mg两种规格。
效 期】
24个月
【执行标准】
WS1-（X-166）-2005Z
【生产企业】
企业名称：辉瑞制药；安万特制药；齐鲁制药；江苏恒瑞医药股份有限公司向左转|向右转
请规范发贴，求助贴请在标题前加【求助】，谢谢您的合作。——by草根
我是新手。我要开始做实验了，但一开始就碰到了个很大的问题。
我想买个能利用哺乳动物细胞RNA聚合酶将DNA转录成RNA的的质粒，向好几家公司打了电话，但都没有我想要的东西。
没有这个东西，我的实验就只能是蓝图了。哪位战友有办法的，能不能帮帮我？
不胜感激。
DNA拓扑异构酶Ⅱ与抗肿瘤药物靶点的研究进展.doc(59.5k)
