Cucurbitacin I
mRNA synthesis
In vitro transcription of capped mRNA with modified nucleotides and Poly(A) tail
Tyramide Signal Amplification (TSA)
TSA (Tyramide Signal Amplification), used for signal amplification of ISH, IHC and IC etc.
Phos Binding Reagent Acrylamide
Separation of phosphorylated and non-phosphorylated proteins without phospho-specific antibody
Cell Counting Kit-8 (CCK-8)
A convenient and sensitive way for cell proliferation assay and cytotoxicity assay
SYBR Safe DNA Gel Stain
Safe and sensitive stain for visualization of DNA or RNA in agarose or acrylamide gels.
Inhibitor Cocktails
Protect the integrity of proteins from multiple proteases and phosphatases for different applications.
Cucurbitacin I(葫芦素I )是JAK2/STAT3信号通路的选择性抑制剂,在A549人肺腺癌细胞系中IC50值为500 nM。它抑制STAT3磷酸酪氨酸水平,抑制STAT3的DNA结合和STAT3介导的基因表达,但对Src、AKT、ERK和JNK的活性没有影响[1]。
JAK/STAT3信号在肿瘤细胞的增殖、存活、侵袭和免疫抑制的调节中至关重要,它以不同方式促进各类癌症的发展[2]。
Cucurbitacin I经常被用来研究STAT3在肿瘤发展中的作用。它可以诱导各种癌细胞凋亡,阻断细胞周期进程。在结肠癌细胞系COLO205中,Cucurbitacin I可以通过抑制细胞迁移和侵袭以及提高化学敏感性,降低细胞活力[3]。
最近的研究表明,在人乳腺癌细胞中,Cucurbitacin I具有抗血管生成的作用[4]。体内基质胶塞实验结果表明,与对照小鼠相比,Cucurbitacin I处理的小鼠血管形成及血红蛋白含量显著降低[5]。因此,Cucurbitacin I对多种癌细胞类型具有有效的抗癌效果。
然而,Cucurbitacin I处理胶质母细胞瘤细胞可以上调beclin1,并触发对细胞凋亡的保护性细胞自噬。删除Beclin 1或使用自噬抑制剂,癌细胞对Cucurbitacin I诱导的细胞凋亡发生敏化[6]。Cucurbitacin I在自体吞噬调节中的作用需要进一步研究。
参考文献:
Blaskovich MA, Sun J, Cantor A et al. Discovery of JSI-124 (cucurbitacin I), a selective Janus kinase/signal transducer and activator of transcription 3 signaling pathway inhibitor with potent antitumor activity against human and murine cancer cells in mice.Cancer Res. 2003 Mar 15;63(6):1270-9.
Yu H, Lee H, Herrmann A et al. Revisiting STAT3 signalling in cancer: new and unexpected biological functions.Nat Rev Cancer. 2014 Nov;14(11):736-46. doi: 10.1038/nrc3818.
Song J, Liu H, Li Z et al. Cucurbitacin I inhibits cell migration and invasion and enhances chemosensitivity in colon cancer. Oncol Rep. 2015 Apr;33(4):1867-71.
Qi J, Xia G, Huang CR et al. JSI-124 (Cucurbitacin I) inhibits tumor angiogenesis of human breast cancer through reduction of STAT3 phosphorylation. Am J Chin Med. 2015;43(2):337-47.
Kim HJ, Kim JK et al. Antiangiogenic effects of cucurbitacin-I. Arch Pharm Res. 2015 Feb;38(2):290-8.
Yuan G, Yan SF, Xue H et al. Cucurbitacin I induces protective autophagy in glioblastoma in vitro and in vivo. J Biol Chem. 2014 Apr 11;289(15):10607-19.
Physical Appearance | A solid |
Storage | Store at -20°C |
M.Wt | 514.65 |
Cas No. | 2222-07-3 |
Formula | C30H42O7 |
Solubility | ≥22.45 mg/mL in DMSO; insoluble in EtOH; ≥51.2 mg/mL in H2O with ultrasonic |
Chemical Name | (8S,9R,10R,13R,14S,16R,17R)-17-[(E,2R)-2,6-dihydroxy-6-methyl-3-oxohept-4-en-2-yl]-2,16-dihydroxy-4,4,9,13,14-pentamethyl-8,10,12,15,16,17-hexahydro-7H-cyclopenta[a]phenanthrene-3,11-dione |
SDF | Download SDF |
Canonical SMILES | CC1(C2=CCC3C4(CC(C(C4(CC(=O)C3(C2C=C(C1=O)O)C)C)C(C)(C(=O)C=CC(C)(C)O)O)O)C)C |
运输条件 | 蓝冰运输或根据您的需求运输。 |
一般建议 | 不同厂家不同批次产品溶解度各有差异,仅做参考。若实验所需浓度过大至产品溶解极限,请添加助溶剂助溶或自行调整浓度。溶液形式一般不宜长期储存,请尽快用完。 |
细胞实验 [1,2]: | |
细胞系 |
COLO205结肠癌细胞系 |
溶解方法 |
该化合物在DMSO中的溶解度大于22.45 mg/mL。若获取更高浓度的溶液,可在37℃下孵育10分钟,随后在超声波浴中摇匀。-20℃以下可储存数月。 |
反应条件 |
100 nM,6 h |
应用 |
Cucurbitacin I(100 nM,6h)以剂量依赖性方式抑制结肠癌细胞COLO205的增殖、迁移和侵袭。Cucurbitacin I使结肠癌细胞系COLO205对5-FU敏感。Cucurbitacin(100 nM)降低了磷酸化STAT3和MMP-9表达的蛋白水平。Cucurbitacin I(10 μM)抑制A549和MDA-MB-468细胞中STAT3和JAK2的磷酸化酪氨酸水平,但不抑制Src。Cucurbitacin I抑制A549、MDA-MB-468、v-Src/3T3、H-Ras/3T3,vector/3T3和Calu-1的细胞增殖,并诱导细胞凋亡。 |
动物实验 [2]: | |
动物模型 |
A549肿瘤、v-Src转化的NIH 3T3肿瘤和人乳腺癌MDA-MB-468裸鼠,携带A549和MDA-MB-468细胞的C57 BL-6裸鼠 |
给药剂量 |
1 mg/kg/day,25天 |
应用 |
Cucurbitacin I(1 mg/kg/day)有效抑制了A549肿瘤、v-Src转化的NIH 3T3肿瘤和人乳腺癌MDA-MB-468裸鼠的肿瘤生长。在携带有组成型激活的STAT3的小鼠黑色素瘤的免疫受体小鼠中,Cucurbitacin I抑制肿瘤生长并显著增加小鼠存活。Cucurbitacin I抑制A549和MDA-MB-468肿瘤生长,对体重、活动或食物摄取没有影响。 |
注意事项 |
由于实验环境的不同,实际溶解度可能与理论值略有不同,请测试室内所有化合物的溶解度。 |
References: [1]. Song J, Liu H, Li Z, et al. Cucurbitacin I inhibits cell migration and invasion and enhances chemosensitivity in colon cancer[J]. Oncology reports, 2015, 33(4): 1867-1871. [2]. Blaskovich M A, Sun J, Cantor A, et al. Discovery of JSI-124 (cucurbitacin I), a selective Janus kinase/signal transducer and activator of transcription 3 signaling pathway inhibitor with potent antitumor activity against human and murine cancer cells in mice[J]. Cancer research, 2003, 63(6): 1270-1279. |