Leptomycin B - CAS:87081-35-4

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Leptomycin B (Synonyms:来普霉素B; CI 940; LMB)

目录号 : KM16848 CAS No. : 87081-35-4

Data Sheet 产品使用指南

Leptomycin B (CI 940; LMB) 是一种蛋白出核转运抑制剂。Leptomycin 通过半胱氨酸残基处的共价修饰使 CRM1/exportin 1 失活。 Leptomycin B 是一种有效的抗真菌抗生素，可阻断真核细胞周期。

规格	价格	是否有货	数量
1mg		In-stock
2mg		In-stock

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生物活性

Leptomycin B (CI 940; LMB) is a potent inhibitor of the nuclear export of proteins. Leptomycin B inactivates CRM1/exportin 1 by covalent modification at a cysteine residue. Leptomycin B is a potent antifungal antibiotic blocking the eukaryotic cell cycle.

体外研究

Leptomycin B (LMB) is very potent in vitro against various cancer cell lines (IC50 values in the 0.1 to 10 nM range). Leptomycin B (LMB) inhibits SiHa, HCT-116, and SKNSH cells with IC₅₀s of 0.4, 0.3 and 0.4 nM for a 72 hour exposure, respectively.
Leptomycin B (LMB) (0.5 nM) displays a synergistic effect on Gefitinib (0–32 μM)-induced cytotoxicity in A549 and H460 cell line. The simultaneous treatments of Gefitinib (0–32 μM) and Leptomycin B (0.5 nM) show synergistic cytotoxic effect on A549 as compared to Gefitinib alone at both 24 and 48 hours.

Cell Viability Assay

Cell Line:	The non-small cell lung cancer (NSCLC) cell lines A549 and H460
Concentration:	0.5 nM
Incubation Time:	24 and 48 hours
Result:	The IC₅₀ of Gefitinib at 48 hours was 32.0±2.5 μM while it was significantly reduced to 25.0±2.1 μM with the combination of 0.5 nM Leptomycin B. The significant synergistic cytotoxic effect from co-treatment of 0.5 nM Leptomycin B with Gefitinib was also confirmed in H460 cell line.

Cell Viability Assay

Cell Line:	A549
Concentration:	0.5 nM
Incubation Time:	48 hours
Result:	0.5 nM Leptomycin B plus Gefitinib or Gefitinib alone had a decreased p-EGFR(Tyr1068) expressions compared with controls. p-Akt (Ser473) was inhibited in a dose-response manner by Gefitinib treatments, but it was enhanced by gefitinib+Leptomycin B co-treatments compared with gefitinib alone. A549 treated by Gefitinib+Leptomycin B had a higher expression of p-Erk1/2(Thr202/Tyr204) than A549 treated by Gefitinib alone.

体内研究

Leptomycin B (LMB) is poorly tolerated in vivo. Maximum tolerated dose (MTD) is 2.5 mg/kg for LMB (single i.v.) in HCT-116 tumor–bearing mice.The limited in vivo efficacy of Leptomycin B is due to off-target effects because our nuclear export inhibitors (NEIs) retain the potent inhibition of CRM1, but are clearly better tolerated in vivo.

分子式

C₃₃H₄₈O₆

分子量

540.73

CAS号

87081-35-4

中文名称

来普霉素B；细霉素B

运输条件

Room temperature in continental US; may vary elsewhere.

储存方式

-20°C, stored under nitrogen

*In solvent : -80°C, 6 months; -20°C, 1 month (stored under nitrogen)

溶解性数据

In Vitro:

DMSO : 100 mg/mL (184.94 mM; Need ultrasonic)

Methanol : 10 mg/mL (18.49 mM; Need ultrasonic and warming)

配制储备液

浓度溶剂体积质量	1 mg	5 mg	10 mg

1 mM	1.8494 mL	9.2468 mL	18.4935 mL
5 mM	0.3699 mL	1.8494 mL	3.6987 mL
10 mM	0.1849 mL	0.9247 mL	1.8494 mL

请根据产品在不同溶剂中的溶解度选择合适的溶剂配制储备液；一旦配成溶液，请分装保存，避免反复冻融造成的产品失效。
储备液的保存方式和期限：-80°C, 6 months; -20°C, 1 month (stored under nitrogen)。-80°C 储存时，请在 6 个月内使用，-20°C 储存时，请在 1 个月内使用。

In Vivo:

请根据您的实验动物和给药方式选择适当的溶解方案。以下溶解方案都请先按照 In Vitro 方式配制澄清的储备液，再依次添加助溶剂：

——为保证实验结果的可靠性，澄清的储备液可以根据储存条件，适当保存；体内实验的工作液，建议您现用现配，当天使用；以下溶剂前显示的百
分比是指该溶剂在您配制终溶液中的体积占比；如在配制过程中出现沉淀、析出现象，可以通过加热和/或超声的方式助溶

1.

请依序添加每种溶剂： 10% DMSO 40% PEG300 5% Tween-80 45% saline
Solubility: ≥ 2.5 mg/mL (4.62 mM); Clear solution

此方案可获得 ≥ 2.5 mg/mL (4.62 mM，饱和度未知) 的澄清溶液。
以 1 mL 工作液为例，取 100 μL 25.0 mg/mL 的澄清 DMSO 储备液加到 400 μL PEG300 中，混合均匀；向上述体系中加入50 μL Tween-80，混合均匀；然后继续加入 450 μL生理盐水定容至 1 mL。
2.

请依序添加每种溶剂： 10% DMSO 90% (20% SBE-β-CD in saline)
Solubility: 2.5 mg/mL (4.62 mM); Suspended solution; Need ultrasonic

此方案可获得 2.5 mg/mL (4.62 mM) 的均匀悬浊液，悬浊液可用于口服和腹腔注射。
以 1 mL 工作液为例，取 100 μL 25.0 mg/mL 的澄清 DMSO 储备液加到 900 μL 20% 的 SBE-β-CD 生理盐水水溶液中，混合均匀。
3.

请依序添加每种溶剂： 10% DMSO 90% corn oil
Solubility: ≥ 2.5 mg/mL (4.62 mM); Clear solution

此方案可获得 ≥ 2.5 mg/mL (4.62 mM，饱和度未知) 的澄清溶液，此方案不适用于实验周期在半个月以上的实验。
以 1 mL 工作液为例，取 100 μL 25.0 mg/mL 的澄清 DMSO 储备液加到 900 μL玉米油中，混合均匀。