| tetramethyl Nordihydroguaiaretic Acidantitumorigenic activity |

Sample solution is provided at 25 µL, 10mM.
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Cell Stem Cell.2017 Nov 20. pii: S1934-5909(17)30375-2.Quality Control & MSDS
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- Purity ≥ 95.00%
- COA (Certificate Of Analysis)
- MSDS (Material Safety Data Sheet)
Chemical structure


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| Cas No. | 24150-24-1 | SDF | Download SDF |
| Synonyms | EM-1421,M4N,Tetrameprocol,tetramethyl NDGA,TMNDGA | ||
| Chemical Name | 4-[(2R,3S)-4-(3,4-dimethoxyphenyl)-2,3-dimethylbutyl]-1,2-dimethoxy-benzene | ||
| Canonical SMILES | COc1cc(ccc1OC)CC(C)C(C)Cc1ccc(OC)c(OC)c1 | ||
| Formula | C22H30O4 | M.Wt | 358.5 |
| Solubility | ≤0.2mg/ml in ethanol;2mg/ml in DMSO;2mg/ml in dimethyl formamide | Storage | Store at -20°C |
| Physical Appearance | A crystalline solid | Shipping Condition | Evaluation sample solution : ship with blue ice.All other available size:ship with RT , or blue ice upon request |
| General tips | For obtaining a higher solubility , please warm the tube at 37 ℃ and shake it in the ultrasonic bath for a while.Stock solution can be stored below -20℃ for several months. | ||
Tetramethyl Nordihydroguaiaretic acid (TMNDGA) is a synthetic derivative of NDGA (Nordihydroguaiaretic acid), a non-selective lipoxygenase inhibitor. TMNDGA showed the strongest anti-HIV activity.
In vitro: In Vero cells, TMNDGA inhibited Sp1 transcription factor binding at the HIV long terminal repeat promoter and at the α-ICP4 promoter with IC50 values of 11 and 43.5 μM, respectively. The IC50 of TMNDGA varied between 11.7 and 4 μM in 10 passages of HSV-1 and 4 passages of HSV-2 [2]. TMNDGA inhibited Sp1-dependent Cdc2 gene expression. In M4N-treated transformed C3 cells, TMNDGA induced growth arrest and apoptosis by suppressing Sp1-dependent Cdc2 and survivin gene expression giving rise to its antitumorigenic activity [3]. TMNDGA treatment suppressed expression of the Sp1-dependent survivin gene. In transiently and stably survivin-transfected C3 cells, TMNDGA reduced caspase-3 activation by 50% and 75%, respectively [3]. TMNDGA inhibited the growth of a number of tumor cell lines by inducing apoptosis in a non-schedule-dependent manner [4]. TMNDGA inhibited the synthesis of DNA by melanoma cells and causes cell cycle arrest in G0/G1 and G2/M phases of the cell cycle [4].
In vivo: TMNDGA effectively inhibited the growth of human tumors in nude mice [5]. TMNDGA inhibited the growth of both murine and human melanomas and human colon cancer without apparent hepatic or renal toxicity [4]. In nude (nu/nu) mice bearing xenografts of human tumor types (Hep 3B, LNCaP, HT-29, MCF7, and K-562), treatment with TMNDGA (i.v. or i.p.) down-regulated Cdc2 and survivin genes expression [5].
References:[1] Hwu J R, Tseng W N, Gnabre J, et al. Antiviral activities of methylated nordihydroguaiaretic acids. 1. Synthesis, structure identification, and inhibition of tat-regulated HIV transactivation[J]. Journal of medicinal chemistry, 1998, 41(16): 2994-3000.[2] Chen H, Teng L, Li J N, et al. Antiviral activities of methylated nordihydroguaiaretic acids. 2. Targeting herpes simplex virus replication by the mutation insensitive transcription inhibitor tetra-O-methyl-NDGA[J]. Journal of medicinal chemistry, 1998, 41(16): 3001-3007.[3] Chang C C, Heller J D, Kuo J, et al. Tetra-O-methyl nordihydroguaiaretic acid induces growth arrest and cellular apoptosis by inhibiting Cdc2 and survivin expression[J]. Proceedings of the National Academy of Sciences of the United States of America, 2004, 101(36): 13239-13244.[4] Lambert J D, Meyers R O, Timmermann B N, et al. Tetra-O-methylnordihydroguaiaretic acid inhibits melanoma in vivo[J]. Cancer letters, 2001, 171(1): 47-56.[5] Park R, Chang C C, Liang Y C, et al. Systemic treatment with tetra-O-methyl nordihydroguaiaretic acid suppresses the growth of human xenograft tumors[J]. Clinical Cancer Research, 2005, 11(12): 4601-4609.
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前段时间用了一下振动切片机,感觉要想准确的切出海马切片不太容易。然后搜索了一下,发现国外用McIlwaintissuechopper这种切片机的人也挺多的,而国内很多都是用的振动切片机。先上两张图
McIlwaintissuechopper
这种切片机的特点是从上向下竖直切下来,每切一次,下面的盘子移动一点点
振动切片机
这种切片机是水平切,将脑组织用502粘在那个小台子上切
两种切片机,我个人的理解是,上面那种可能要更好一点,对于振动切片机,组织块用502粘在小台子上,如果组织块比较大,下面一点点组织浪费也不要紧。但是如果我想切海马,先把海马剥离出来,然后再粘贴在振动切片机上,这样就没办法切了,海马体是个细长的结构,粘上去基本上就全浪费了(我看到很多国内文献都是用的振动切片机,先分离出海马体,然后再切,不知道他们是怎么解决这个问题的,在我看来,1到2周的乳大鼠,分离出的海马体是非常小的,再用胶水粘在小台子上,那都没得切了,不要告诉我说少涂掉胶水,这也解决不了根本问题)但是如果我平放在上面的组织切片机上,从上向下切,这样就没事,可以切出很多切片,完全不会浪费,但还是有个问题,上面那种切片机,虽然每切一次,下面的盘子移动一点距离,但脑组织毕竟是非常柔软的,会不会因为太柔软而不能切的均匀?放在冰水混合物中冻硬一点能不能解决这个问题?
家用的菜刀也叫切片机,工业用的医院切组织用的也叫切片机。
1:德国美康冰冻切片机:
德国美康HM550型冰冻切片机,使用双半导体致冷技术,切片机箱体制冷-35℃,快速制冷架一次可放12个样品,其中4个位点可降温至-60℃,样品头制冷可达-50℃。采用步进马达进样技术,切片厚度精度稳定,切片厚度范围:1-500微米。切片厚度的调整位于冷冻箱体之外便于操作。具有样品头位置记忆功能,切片计数功能,全自动化程序除霜功能,切片回缩功能,完全满足日常冰冻切片快速,精确,安全的需要。
2:徕卡切片机:
准确的诊断有赖于精确的切片。精确的切片依靠正确类型的切片机。徕卡开创了切片术的历史,不断提供各种系列的切片机,为各项应用供应高质量的切片。选择适用于您标本类型的徕卡切片机,树立诊断信心,给予患者更可信赖的保障。
3:切片机类型:
轮转式切片机:进行精确的手动、半自动化或全自动化切片。
平推式切片机:平推式切片机,平稳地制备组织或生物标本。
振动式切片机:在生理条件下进行切片。
4:切片机本身国产的跟进口的没什么区别,主要就体现在刀片上,我用的这款浩博切片机就是国产的机器配进口的刀片,很好使的,价格便宜了好多。
排除方法:
1.检查电源保证三相正常;和相序正常;
2.测量电压,把电压调整正常;
3.修理、更换接触器、排除线路故障。
4.更换按钮开关
故障2:液压系统压力过低或油缸不动作
排除方法:
1.把电动机转向纠正;
2.修理或更换油泵;
3.把系统压力调整正确;
4.检查吸油管路,更换密封件,排除渗漏;
5.加油至油标中位;
6.清洗或更换吸油或回油滤芯;
7.把油缸接头处的软管拧松,来回运动排气;
8.按要求更换液压油。
故障3:喂料减速机无动作或动作不稳定
排除方法:
1.检查电源保证三相正常;和相序正常;
2.测量电压,把电压调整正常;
3.修理、更换接触器、排除线路故障。
2、装机功率:MB达到50-85KW; MB135KW,而HTC虽然也是75KW,但是将砂浆泵的功率设为0.75KW,根据这一要求,更是将其使用辅料的范围直接限定成了只能用日本的切割液,并且是用日本的“619”配方的硅片切割液,对用户来说带来了很大的麻烦。由于HTC的装机功率极其的小,如果用国内的太阳能硅片切割液,就会因为液的粘度太大,无法协调硅片切割液和碳化硅微粉的配比比例和砂浆粘度的问题,除非切割液厂家为其专供。
3、对切割原料的要求:
MB等机器,要求硅片切割液和碳化硅微粉的配比比例一般控制在1:0.92-0.95,砂浆密度在1.630-1.635就可以切的相当理想。即便出现配比比例更大,甚至砂浆密度达到1.67左右都照样不会有什么问题,只要砂浆粘度控制在200--250就可以。但是HTC要求砂浆密度不能高于1.57,就是说只能控制在1.55-1.57.砂浆粘度在150左右,这样国内的硅片切割液液就会出现砂浆密度配在1.57,可能砂浆粘度还不到120,而如果把砂浆粘度调到150,密度就超过了1.57,甚至超过了1.60。砂浆粘度过大,直接的说法是会导致机器报警,其实更深层次的影响还有可能会导致片子洗不干净,出现灼伤片,或者电机发热,对机器本身的轴承有很大的磨损。
切片机是切制薄而均匀组织片的机械,组织用坚硬的石蜡或其他物质支持,每切一次借切片厚度器自动向前(向刀的方向)推进所需距离,厚度器的梯度通常为1微米。切制石蜡包埋的组织时,由于与前一张切片的蜡边粘着,而制成多张切片的切片条。

