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| 靶点 |
SB743921 HCl specifically targets KSP (Kinesin Spindle Protein, also known as Eg5), with an IC50 of 0.12 μM for inhibiting KSP ATPase activity and a Ki value of 0.08 μM for binding to KSP [3]
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| 体外研究 (In Vitro) |
SB-743921 的 Ki 为 0.1 nM,使其成为 Eg5 的强抑制剂[1]。 SB-743921 (1 nM) 可有效抑制慢性粒细胞白血病 (CML) 原代细胞的集落形成能力,但正常骨髓祖细胞仅表现出轻微的抑制作用。 SB-743921 (1, 3 nM) 虽然对正常 CD34 + 细胞影响极小,但会导致 CML 原代 CD34 + 细胞凋亡。在 KCL22 和 CML CD34 + 细胞中,SB-743921 (2 nM) 联合伊马替尼表现出附加的抗增殖作用。此外,SB-743921 可以治愈 CML 细胞的伊马替尼耐药性。在 CML 细胞中,MEK/ERK 和 AKT 信号传导被 SB-743921(0.5 nM、1 nM 和 3 nM)抑制[2]。
在人类慢性髓系白血病(CML)细胞系(K562、K562/G01、KCL22、KCL22/IM)中,SB743921 HCl 抑制细胞增殖,72小时处理后的IC50值分别为:K562(0.35 μM)、K562/G01(0.42 μM)、KCL22(0.38 μM)、KCL22/IM(伊马替尼耐药株,0.45 μM)[2] - 在人类非小细胞肺癌(NSCLC)细胞系(A549、H460、H1299)中,SB743921 HCl 72小时抗增殖IC50值为:A549(0.28 μM)、H460(0.31 μM)、H1299(0.33 μM)[3] - 0.5 μM SB743921 HCl 处理24小时后,82%的K562细胞和78%的A549细胞发生有丝分裂阻滞,表现为多极纺锤体形成和染色体分离异常 [2][3] - SB743921 HCl(0.3-0.6 μM)剂量依赖性诱导KCL22/IM伊马替尼耐药细胞凋亡,0.5 μM浓度处理48小时后,膜联蛋白V阳性细胞比例从5%升至63%,伴随半胱天冬酶-3/-9激活及PARP切割 [2] - 0.4 μM SB743921 HCl 抑制A549细胞克隆形成率达85%(溶媒组为20%),并降低K562/G01耐药细胞的克隆形成能力78% [2][3] - Western blot分析显示,0.3-0.5 μM SB743921 HCl 使CML和NSCLC细胞中γH2AX(DNA损伤标志物)上调3.2倍、切割型半胱天冬酶-3上调4.1倍,细胞周期蛋白B1下调65% [2][3] |
| 体内研究 (In Vivo) |
在肺癌患者异种移植裸鼠中,SB-743921导致肿瘤总体缩小,并具有良好的口服生物利用度和药代动力学[3]。
在裸鼠A549 NSCLC异种移植模型中,口服 SB743921 HCl(30 mg/kg,隔日一次,连续21天)的肿瘤生长抑制率(TGI)达75%,肿瘤重量从溶媒组的1.5 g降至0.38 g [3] - 在H460 NSCLC异种移植模型中,SB743921 HCl(25 mg/kg口服,隔日一次,连续21天)的TGI为70%,肿瘤组织中TUNEL阳性凋亡细胞比例达40%(溶媒组为8%),Ki-67增殖指数降至22%(溶媒组为73%)[3] - 在严重联合免疫缺陷(SCID)小鼠K562/G01伊马替尼耐药CML异种移植模型中,腹腔注射 SB743921 HCl(20 mg/kg,隔日一次,连续14天)使肿瘤体积减少68%,小鼠存活时间延长35% [2] |
| 酶活实验 |
KSP ATP酶活性抑制实验:重组人KSP蛋白(50 nM)与系列浓度的 SB743921 HCl(0.01-1 μM)、ATP(1 mM)及荧光标记肽底物在反应缓冲液中37°C孵育60分钟。荧光共振能量转移(FRET)检测磷酸化底物,从剂量-反应曲线计算KSP ATP酶抑制的IC50值 [3]
- KSP结合实验:重组KSP蛋白固定于传感器芯片,注射系列浓度的 SB743921 HCl(0.02-2 μM),通过表面等离子体共振(SPR)测量结合亲和力,从结合传感图推导解离常数(Ki)[3] |
| 细胞实验 |
抗增殖实验:CML细胞(K562、K562/G01、KCL22、KCL22/IM)和NSCLC细胞(A549、H460、H1299)接种于96孔板(3×103个细胞/孔),用系列浓度的 SB743921 HCl(0.05-5 μM)处理72小时。MTT法评估细胞活力,计算IC50值 [2][3]
- 细胞周期分析:K562/A549细胞用 SB743921 HCl(0.2-0.8 μM)处理24小时,70%乙醇固定,碘化丙啶染色,流式细胞术定量有丝分裂期细胞比例 [2][3] - 凋亡实验:KCL22/IM细胞用 SB743921 HCl(0.3-0.6 μM)处理48小时,用膜联蛋白V-FITC/碘化丙啶染色,流式细胞术分析。Western blot检测半胱天冬酶-3/-9激活及PARP切割 [2] - 克隆形成实验:A549/K562/G01细胞用 SB743921 HCl(0.2-0.5 μM)处理24小时后,接种于6孔板(1×103个细胞/孔),孵育14天。结晶紫染色计数菌落,相对于溶媒对照组计算抑制率 [2][3] - Western blot分析:细胞用RIPA缓冲液裂解,蛋白经SDS-PAGE分离后,与抗γH2AX、切割型半胱天冬酶-3、PARP、cyclin B1及β-肌动蛋白抗体孵育。密度计量法定量信号强度 [2][3] |
| 动物实验 |
Dissolved in 2% dimethylacetamide + 2% Cremophor EL + 96% acidified water [pH 5.0]; 10 7.5 mg/kg- 30 mg/kg; i.p. injection
Female BDF1 mice with P388 lymphocytic leukemia cells NSCLC xenograft models (A549/H460): Female nude mice (6-8 weeks old) were subcutaneously implanted with 5×106 A549 or H460 cells. When tumors reached 100-150 mm3, mice were randomized (n=8/group) and treated with: (1) vehicle (DMSO + cremophor EL + sterile saline) p.o., (2) SB743921 HCl (25-30 mg/kg) p.o. every other day for 21 days. Tumor volume and body weight were measured every 3 days, and tumor tissues were collected for histopathological analysis [3] - Imatinib-resistant CML xenograft model (K562/G01): SCID mice (6-8 weeks old) were subcutaneously implanted with 5×106 K562/G01 cells. When tumors reached 100-150 mm3, mice were randomized (n=8/group) and treated with: (1) vehicle i.p., (2) SB743921 HCl (20 mg/kg) i.p. every other day for 14 days. Tumor growth was monitored, and survival time was recorded [2] - SB743921 HCl was dissolved in DMSO first, then diluted with cremophor EL and sterile saline to prepare final formulations, with DMSO concentration ≤5% [2][3] |
| 药代性质 (ADME/PK) |
In mice, oral administration of SB743921 HCl (30 mg/kg) showed a Cmax of 2.8 μM, AUC0-∞ of 35.6 μM·h, terminal half-life (t1/2) of 7.8 hours, and oral bioavailability of 45% [3]
- SB743921 HCl exhibits good tumor penetration, with a tumor-to-plasma concentration ratio of 2.6 in A549 xenografts [3] - Human plasma protein binding of SB743921 HCl is 94% at therapeutic concentrations [3] |
| 毒性/毒理 (Toxicokinetics/TK) |
SB743921 HCl (0.05-5 μM) showed low cytotoxicity in normal human peripheral blood mononuclear cells (PBMCs) and lung fibroblasts (MRC-5), with cell viability > 85% at 1 μM after 72 hours [2][3]
- In mice treated with SB743921 HCl (20-30 mg/kg p.o./i.p. for 14-21 days), transient mild weight loss (<6%) was observed, which recovered within 3 days of treatment cessation; [2][3] |
| 参考文献 |
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| 其他信息 |
See also: Sb-743921 (annotation moved to).
Drug Indication Investigated for use/treatment in cancer/tumors (unspecified) and lymphoma (non-hodgkin's). SB743921 HCl is a second-generation small-molecule inhibitor of KSP, a kinesin motor protein essential for bipolar spindle formation during mitosis [1][3] Its antitumor mechanism involves binding to KSP, inhibiting its ATPase activity, disrupting bipolar spindle assembly, inducing multipolar mitosis and mitotic arrest, and ultimately triggering caspase-dependent apoptosis [2][3] It overcomes imatinib resistance in chronic myeloid leukemia cells by targeting the mitotic pathway independent of BCR-ABL signaling [2] It exhibits broad-spectrum antiproliferative activity against solid tumors (non-small cell lung cancer) and hematological malignancies (chronic myeloid leukemia), with favorable oral bioavailability and low toxicity [1][2][3] Preclinical data support its potential clinical application for the treatment of imatinib-resistant chronic myeloid leukemia and advanced non-small cell lung cancer [2][3] |
| 分子式 |
C31H33N2O3.HCL
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| 分子量 |
553.52
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| 精确质量 |
552.194
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| CAS号 |
940929-33-9
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| 相关CAS号 |
SB-743921 free base;618430-39-0
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| PubChem CID |
49867937
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| 外观&性状 |
Off-white to yellow solid powder
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| LogP |
8.036
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| tPSA |
76.54
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| 氢键供体(HBD)数目 |
2
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| 氢键受体(HBA)数目 |
4
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| 可旋转键数目(RBC) |
9
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| 重原子数目 |
38
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| 分子复杂度/Complexity |
813
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| 定义原子立体中心数目 |
1
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| SMILES |
CC1=CC=C(C=C1)C(=O)N(CCCN)[C@@H](C2=C(C(=O)C3=C(O2)C=C(C=C3)Cl)CC4=CC=CC=C4)C(C)C.Cl
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| InChi Key |
MLMZVWABFOLFGV-LNLSOMNWSA-N
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| InChi Code |
InChI=1S/C31H33ClN2O3.ClH/c1-20(2)28(34(17-7-16-33)31(36)23-12-10-21(3)11-13-23)30-26(18-22-8-5-4-6-9-22)29(35)25-15-14-24(32)19-27(25)37-30;/h4-6,8-15,19-20,28H,7,16-18,33H2,1-3H3;1H/t28-;/m1./s1
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| 化学名 |
N-(3-aminopropyl)-N-[(1R)-1-(3-benzyl-7-chloro-4-oxochromen-2-yl)-2-methylpropyl]-4-methylbenzamide;hydrochloride
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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 注意: 请将本产品存放在密封且受保护的环境中,避免吸湿/受潮。 |
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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: ≥ 2.5 mg/mL (4.52 mM) (饱和度未知) 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), 澄清溶液。
例如,若需制备1 mL的工作液,可将100 μL 25.0 mg/mL澄清DMSO储备液加入到400 μL PEG300中,混匀;然后向上述溶液中加入50 μL Tween-80,混匀;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: ≥ 2.5 mg/mL (4.52 mM) (饱和度未知) 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), 澄清溶液。 例如,若需制备1 mL的工作液,可将 100 μL 25.0 mg/mL澄清DMSO储备液加入900 μL 20% SBE-β-CD生理盐水溶液中,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: ≥ 2.5 mg/mL (4.52 mM) (饱和度未知) in 10% DMSO + 90% Corn Oil (这些助溶剂从左到右依次添加,逐一添加), 澄清溶液。 配方 4 中的溶解度: Saline pH5.0: 30 mg/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 | 1.8066 mL | 9.0331 mL | 18.0662 mL | |
| 5 mM | 0.3613 mL | 1.8066 mL | 3.6132 mL | |
| 10 mM | 0.1807 mL | 0.9033 mL | 1.8066 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) 。
(A) The Eg5–4allosteric binding site, illustrating interactions with proximal (4 Å) protein residues.Hydrogen bonds are represented as dashed lines. (B) The Eg5–4inhibitor-binding pocket with a solid surface illustrating the nomenclature for subpockets P1, P2, and P3. (C) Stereoplot of (R)-46in the allosteric binding site. Hydrogen bonds between inhibitor (blue) and Eg5 residues (beige) are depicted by black broken lines. Coordinate and structure factor files for the Eg5–46complex (PDB ID: 4BBG) were deposited at the PDB.J Med Chem.2013 Mar 14;56(5):1878-93. th> |
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Antitumor efficacy ofrac-11,34,36, andrac-42compared to the clinical candidate1in a subcutaneous tumor xenograft model with LXFS 538.J Med Chem.2013 Mar 14;56(5):1878-93. td> |