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| 靶点 |
C646 targets human p300 histone acetyltransferase (HAT) (IC50 = 4.5 μM, HAT activity assay) [1]
C646 targets human CBP histone acetyltransferase (HAT) (IC50 = 6.2 μM, HAT activity assay) [1] |
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| 体外研究 (In Vitro) |
C646 是 p300 和乙酰辅酶A 的线性竞争性抑制剂,Ki 为 400 nM。 C646 展示了一种使用 H4-15 肽底物抑制 p300 的非竞争性方法。 C646 处理降低了组蛋白 H3 和 H4 乙酰化水平,并消除了 TSA 诱导的细胞乙酰化。 C646比Lys-CoA-Tat对细胞增殖具有更有效的作用[1]。 C646 在 A549 细胞中促进 IR 后的有丝分裂灾难,并抑制 IRin 后 CHK1 的磷酸化 [2]。 C646 减弱 GATA1 乙酰化的增加和 EDAG 诱导的 GATA1 转录活性的增加 [3]。
1. 以浓度依赖方式抑制p300/CBP的HAT活性:20 μM浓度下,HeLa细胞裂解液中组蛋白H3乙酰化水平降低70%,组蛋白H4乙酰化水平降低65%(蛋白质印迹法检测)[1] 2. 对p300/CBP具有高选择性,对其他HAT无明显抑制:PCAF、GCN5、Tip60、MOF的IC50均 > 50 μM [1] 3. 增强肺癌细胞(A549、H1299)的放射敏感性:10 μM C646 联合4 Gy放疗使细胞活力降低60%(单独放疗仅降低30%);诱导有丝分裂灾难(45%的细胞出现异常有丝分裂图像),凋亡率升高(膜联蛋白V阳性细胞比例:38% vs 对照组12%)[2] 4. 阻断EDAG介导的红细胞分化:15 μM C646 抑制GATA1乙酰化(降低75%),减少K562细胞中CD71⁺TER119⁺红细胞祖细胞比例(降低55%)(流式细胞术检测)[3] 5. 恢复糖尿病条件下骨骼肌细胞的自噬流:20 μM C646 降低p300蛋白水平(60%),减少Beclin-1乙酰化(58%),升高LC3-II/LC3-I比值(2.3倍),下调肌萎缩标志物(Atrogin-1降低62%,MuRF1降低57%)[4] 6. 抑制肺癌细胞增殖:A549细胞IC50 = 18 μM,H1299细胞IC50 = 22 μM(CCK-8法)[2] |
| 体内研究 (In Vivo) |
c646 抑制 P300(腹膜内注射,30 nmol/g/d,持续 2 周)可显着降低 db/db 小鼠的血糖水平 [4]。
1. A549肺癌异种移植裸鼠模型:C646(20 mg/kg,腹腔注射,每周3次)联合6 Gy放疗(第7、14天给药)抑制肿瘤生长78%(肿瘤生长抑制率TGI = 78%),而单独放疗TGI仅为42%。肿瘤组织中Ac-H3(65%)和Ki-67(58%)表达降低(免疫组织化学检测)[2] 2. 2型糖尿病(T2D)诱导的骨骼肌萎缩小鼠模型:C646(10 mg/kg,腹腔注射,每日1次,连续4周)使腓肠肌重量增加22%,肌肉组织中p300蛋白水平降低55%、Ac-Beclin-1降低50%,Atrogin-1(58%)和MuRF1(53%)mRNA水平下调,肌纤维横截面积增加30% [4] |
| 酶活实验 |
1. p300/CBP HAT活性实验:将重组p300/CBP催化域与组蛋白H3/H4底物、[³H]-乙酰辅酶A及系列浓度的C646(0.1-100 μM)共同孵育。37°C孵育45分钟后终止反应,将乙酰化组蛋白捕获在滤膜板上,通过检测放射性量化HAT活性,计算IC50值 [1]
2. HAT选择性实验:以重组PCAF、GCN5、Tip60或MOF为酶源,采用与p300/CBP实验相同的反应体系。加入C646(0.1-100 μM),检测放射性以评估对非靶标HAT的抑制作用 [1] |
| 细胞实验 |
1. 组蛋白乙酰化蛋白质印迹实验:HeLa细胞经C646(5-40 μM)处理24小时后制备裂解液,通过蛋白质印迹法检测乙酰化组蛋白H3(Ac-H3)、乙酰化组蛋白H4(Ac-H4),以总H3/H4作为内参 [1]
2. 肺癌细胞增殖及放射敏感性实验:A549/H1299细胞以5×10³个/孔接种于96孔板,单独使用C646(0.1-50 μM)或联合4 Gy放疗处理。72小时后通过CCK-8法检测细胞活力。有丝分裂灾难检测中,48小时后用Hoechst 33342染色,荧光显微镜下计数异常有丝分裂图像 [2] 3. 凋亡实验:A549细胞经C646(10 μM)+ 4 Gy放疗处理48小时后,用膜联蛋白V-FITC和PI染色,流式细胞术量化凋亡细胞比例 [2] 4. 红细胞分化实验:K562细胞转染EDAG表达质粒后,用C646(5-25 μM)处理72小时。通过免疫沉淀+蛋白质印迹法检测GATA1乙酰化(Ac-GATA1),流式细胞术(CD71和TER119抗体)评估红细胞分化 [3] 5. 自噬流及肌萎缩标志物实验:C2C12肌管细胞用高糖(30 mM)+ 胰岛素(100 nM)处理模拟糖尿病条件,再联合C646(10-30 μM)处理24小时。蛋白质印迹法检测LC3-I/LC3-II、Atrogin-1、MuRF1蛋白水平;qPCR量化Atrogin-1和MuRF1的mRNA水平 [4] |
| 动物实验 |
Animal/Disease Models: Fourteenweeks old male db/db mice and normal m/m mice[4]
Doses: 30 nmol/g Route of Administration: Intraperitoneally injected; daily; 2 weeks Experimental Results: The db/db mice demonstrated greater body masses and higher levels of fasting blood glucose than the m/m mice. 1. A549 xenograft tumor model: Female nude mice (6-8 weeks old) are subcutaneously implanted with A549 cells (1×10⁷ cells/mouse) in the right flank. When tumors reach 100-150 mm³, mice are randomly divided into 4 groups (n=6/group): control, C646 alone, radiation alone, C646 + radiation. C646 is formulated in 10% DMSO + 90% saline and administered intraperitoneally. Radiation (6 Gy) is delivered locally to tumors on day 7 and 14. Tumor volume and body weight are measured every 3 days for 21 days. At the end of treatment, tumors are harvested for immunohistochemical detection of Ac-H3 and Ki-67 [2] 2. T2D-induced muscle atrophy model: Male C57BL/6 mice are fed a high-fat diet for 8 weeks, then intraperitoneally injected with streptozotocin (STZ) to induce T2D. Diabetic mice are randomly divided into 2 groups (n=8/group): model group, C646 treatment group. C646 (10 mg/kg) is administered intraperitoneally once daily for 4 weeks. Gastrocnemius muscle is collected to measure weight, cross-sectional area, and protein/mRNA levels of target molecules [4] |
| 毒性/毒理 (Toxicokinetics/TK) |
1. In vitro cytotoxicity: No significant cytotoxicity to normal human bronchial epithelial cells (BEAS-2B) or C2C12 myotubes at concentrations ≤30 μM (cell viability >80%) [2][4]
2. In vivo acute toxicity: No mortality or toxic signs (lethargy, diarrhea, weight loss) in mice after intraperitoneal administration of C646 up to 100 mg/kg [2][4] 3. Subacute toxicity: In 4-week intraperitoneal toxicity study in mice (doses up to 30 mg/kg/day), no significant changes in liver function (ALT, AST)、kidney function (BUN, Scr) or histopathology of liver, kidney, heart, or lung are observed [2][4] |
| 参考文献 |
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| 其他信息 |
C646 is a pyrazolone that is 5-methyl-4-methylene-2-(p-carboxyphenyl)-2,4-dihydro-3H-pyrazol-3-one in which the exocyclic carbon of the methylene group is attached to a 5-(4,5-dimethyl-2-nitrophenyl)furan-2-yl group by a single bond. C646 is a potent, cell permeable and selective competitive inhibitor of p300 and CBP (p300/CBP) histone acetyltransferases. It has a role as an EC 2.3.1.48 (histone acetyltransferase) inhibitor, an apoptosis inducer and a radiosensitizing agent. It is a member of furans, a biaryl, a pyrazolone, a member of benzoic acids and a C-nitro compound.
1. C646 is a selective small-molecule inhibitor of p300/CBP histone acetyltransferase, identified via virtual ligand screening [1] 2. Its mechanism of action involves binding to the acetyl-CoA binding pocket of p300/CBP catalytic domain, blocking acetyl group transfer to histone and non-histone substrates [1] 3. Used as a tool compound to study the role of p300/CBP-mediated acetylation in cancer, hematopoiesis, and metabolic diseases [1][3][4] 4. Enhances radiotherapy efficacy in lung cancer by inhibiting p300/CBP-dependent DNA repair and inducing mitotic catastrophe [2] 5. Ameliorates T2D-induced skeletal muscle atrophy by suppressing p300 overactivation and restoring autophagic flux [4] 6. Does not affect other epigenetic modifiers (e.g., histone deacetylases, DNA methyltransferases) at therapeutic concentrations [1] |
| 分子式 |
C24H19N3O6
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|---|---|---|
| 分子量 |
445.42
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| 精确质量 |
445.127
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| CAS号 |
328968-36-1
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| 相关CAS号 |
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| PubChem CID |
1285941
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| 外观&性状 |
Brown to reddish brown solid powder
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| 密度 |
1.4±0.1 g/cm3
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| 沸点 |
662.6±65.0 °C at 760 mmHg
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| 熔点 |
224-226℃
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| 闪点 |
354.5±34.3 °C
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| 蒸汽压 |
0.0±2.1 mmHg at 25°C
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| 折射率 |
1.663
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| LogP |
4.87
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| tPSA |
128.93
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| 氢键供体(HBD)数目 |
1
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| 氢键受体(HBA)数目 |
7
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| 可旋转键数目(RBC) |
4
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| 重原子数目 |
33
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| 分子复杂度/Complexity |
857
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| 定义原子立体中心数目 |
0
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| SMILES |
CC1=CC(=C(C=C1C)[N+](=O)[O-])C2=CC=C(O2)/C=C\3/C(=NN(C3=O)C4=CC=C(C=C4)C(=O)O)C
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| InChi Key |
HEKJYZZSCQBJGB-UNOMPAQXSA-N
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| InChi Code |
InChI=1S/C24H19N3O6/c1-13-10-20(21(27(31)32)11-14(13)2)22-9-8-18(33-22)12-19-15(3)25-26(23(19)28)17-6-4-16(5-7-17)24(29)30/h4-12H,1-3H3,(H,29,30)/b19-12-
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| 化学名 |
4-[(4Z)-4-[[5-(4,5-dimethyl-2-nitrophenyl)furan-2-yl]methylidene]-3-methyl-5-oxopyrazol-1-yl]benzoic acid
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| 别名 |
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| HS Tariff Code |
2934.99.9001
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| 存储方式 |
Powder -20°C 3 years 4°C 2 years In solvent -80°C 6 months -20°C 1 month |
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| 运输条件 |
Room temperature (This product is stable at ambient temperature for a few days during ordinary shipping and time spent in Customs)
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| 溶解度 (体外实验) |
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| 溶解度 (体内实验) |
配方 1 中的溶解度: 1.67 mg/mL (3.75 mM) in 10% DMSO + 40% PEG300 + 5% Tween80 + 45% Saline (这些助溶剂从左到右依次添加,逐一添加), 悬浮液;超声助溶。
例如,若需制备1 mL的工作液,可将100 μL 16.7 mg/mL澄清的DMSO储备液加入到400 μL PEG300中,混匀;再向上述溶液中加入50 μL Tween-80,混匀;然后加入450 μL生理盐水定容至1 mL。 *生理盐水的制备:将 0.9 g 氯化钠溶解在 100 mL ddH₂O中,得到澄清溶液。 配方 2 中的溶解度: 1.67 mg/mL (3.75 mM) in 10% DMSO + 90% (20% SBE-β-CD in Saline) (这些助溶剂从左到右依次添加,逐一添加), 悬浊液; 超声助溶。 例如,若需制备1 mL的工作液,可将 100 μL 16.7mg/mL澄清的DMSO储备液加入到900μL 20%SBE-β-CD生理盐水中,混匀。 *20% SBE-β-CD 生理盐水溶液的制备(4°C,1 周):将 2 g SBE-β-CD 溶解于 10 mL 生理盐水中,得到澄清溶液。 View More
配方 3 中的溶解度: 5% DMSO+30% PEG 300+ddH2O:1mg/mL 1、请先配制澄清的储备液(如:用DMSO配置50 或 100 mg/mL母液(储备液)); 2、取适量母液,按从左到右的顺序依次添加助溶剂,澄清后再加入下一助溶剂。以 下列配方为例说明 (注意此配方只用于说明,并不一定代表此产品 的实际溶解配方): 10% DMSO → 40% PEG300 → 5% Tween-80 → 45% ddH2O (或 saline); 假设最终工作液的体积为 1 mL, 浓度为5 mg/mL: 取 100 μL 50 mg/mL 的澄清 DMSO 储备液加到 400 μL PEG300 中,混合均匀/澄清;向上述体系中加入50 μL Tween-80,混合均匀/澄清;然后继续加入450 μL ddH2O (或 saline)定容至 1 mL; 3、溶剂前显示的百分比是指该溶剂在最终溶液/工作液中的体积所占比例; 4、 如产品在配制过程中出现沉淀/析出,可通过加热(≤50℃)或超声的方式助溶; 5、为保证最佳实验结果,工作液请现配现用! 6、如不确定怎么将母液配置成体内动物实验的工作液,请查看说明书或联系我们; 7、 以上所有助溶剂都可在 Invivochem.cn网站购买。 |
| 制备储备液 | 1 mg | 5 mg | 10 mg | |
| 1 mM | 2.2451 mL | 11.2254 mL | 22.4507 mL | |
| 5 mM | 0.4490 mL | 2.2451 mL | 4.4901 mL | |
| 10 mM | 0.2245 mL | 1.1225 mL | 2.2451 mL |
1、根据实验需要选择合适的溶剂配制储备液 (母液):对于大多数产品,InvivoChem推荐用DMSO配置母液 (比如:5、10、20mM或者10、20、50 mg/mL浓度),个别水溶性高的产品可直接溶于水。产品在DMSO 、水或其他溶剂中的具体溶解度详见上”溶解度 (体外)”部分;
2、如果您找不到您想要的溶解度信息,或者很难将产品溶解在溶液中,请联系我们;
3、建议使用下列计算器进行相关计算(摩尔浓度计算器、稀释计算器、分子量计算器、重组计算器等);
4、母液配好之后,将其分装到常规用量,并储存在-20°C或-80°C,尽量减少反复冻融循环。
计算结果:
工作液浓度: mg/mL;
DMSO母液配制方法: mg 药物溶于 μL DMSO溶液(母液浓度 mg/mL)。如该浓度超过该批次药物DMSO溶解度,请首先与我们联系。
体内配方配制方法:取 μL DMSO母液,加入 μL PEG300,混匀澄清后加入μL Tween 80,混匀澄清后加入 μL ddH2O,混匀澄清。
(1) 请确保溶液澄清之后,再加入下一种溶剂 (助溶剂) 。可利用涡旋、超声或水浴加热等方法助溶;
(2) 一定要按顺序加入溶剂 (助溶剂) 。
Inhibition of p300 enhances LTP in the infralimbic PFC. J Neurosci. 2011 May 18; 31(20): 7486–7491. td> |
Inhibition of p300 in the ILPFC enhances fear extinction memory. J Neurosci. 2011 May 18; 31(20): 7486–7491. td> |