生物活性

E-64 (Proteinase inhibitor E 64) is a potent irreversible inhibitor against general cysteine proteases with IC₅₀ of 9 nM for papain.

IC₅₀ & Target

IC50: 9 nM (Papain)^[1]

体外研究
(In Vitro)

E-64 (Proteinase inhibitor E 64) is a cathepsin B-specific inhibitor, and its binding modes with papain, actinidin, cathepsin L, and cathepsin K have been reviewed at the atomic level. E-64 has been widely used as a potent and irreversible (covalent-type) inhibitor for many cysteine proteases such as papain, ficin, actinidin, cathepsin B and L^[1]. The S.cervi adult parasites are incubated in the Kreb's Ringer bicarbonate (KRB) maintenance medium for 8 h at 37°C, 5% CO₂ with 5, 10, 20 and 40 μM concentration of E-64. E-64 shows a concentration and time dependent decrease in motility and viability of the parasites (EC₅₀=16 μM)^[2].

体内研究
(In Vivo)

A broad spectrum of expression of CD4 and CD19 is found exists in both the islets and pancreatic lymph nodes (PLNs) and that anti-serpin B13 mAb exposure causes a significant shift that favored cells expressing low-to-intermediate amounts of these markers. However, this shift is abolished in animals that receive anti-serpin B13 mAb in the presence of the protease inhibitor E-64 (Proteinase inhibitor E 64), which maintains its blocking activity under the experimental conditions used^[3]. Dahl salt-sensitive (SS) rats are fed an 8% high salt NaCl diet and intravenously infused with the irreversible cysteine cathepsin inhibitor E-64 (1 mg/day) or the vehicle (control). Both the control and E-64 infused groups develope significant hypertension and kidney damage, and no difference of the mean arterial pressure and the hypertension-associated albuminuria is observed between the groups^[4].

分子量

357.41

Formula

C??H??N?O?

CAS 号

66701-25-5

SMILES

O=C([C@H]1O[C@@H]1C(N[C@H](C(NCCCCNC(N)=N)=O)CC(C)C)=O)O

运输条件

Room temperature in continental US; may vary elsewhere.

储存方式

溶解性数据

In Vitro: 

DMSO : 50 mg/mL (139.90 mM; Need ultrasonic)

H₂O : 12.5 mg/mL (34.97 mM; Need ultrasonic)

配制储备液

*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。-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: ≥ 2.08 mg/mL (5.82 mM); Clear solution

此方案可获得 ≥ 2.08 mg/mL (5.82 mM，饱和度未知) 的澄清溶液。

以 1 mL 工作液为例，取 100 μL 20.8 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: ≥ 2.08 mg/mL (5.82 mM); Clear solution

此方案可获得 ≥ 2.08 mg/mL (5.82 mM，饱和度未知) 的澄清溶液。

以 1 mL 工作液为例，取 100 μL 20.8 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: ≥ 2.08 mg/mL (5.82 mM); Clear solution

此方案可获得 ≥ 2.08 mg/mL (5.82 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 20.8 mg/mL 的澄清 DMSO 储备液加到 900 μL玉米油中，混合均匀。

参考文献

[1]. Matsumoto K, et al. Structural basis of inhibition of cysteine proteases by E-64 and its derivatives. Biopolymers. 1999;51(1):99-107.

[2]. Wadhawan M, et al. Inhibition of cathepsin B by E-64 induces oxidative stress and apoptosis in filarial parasite. PLoS One. 2014 Mar 25;9(3):e93161.

[3]. Baldzizhar R, et al. Anti-serpin antibody-mediated regulation of proteases in autoimmune diabetes. J Biol Chem. 2013 Jan 18;288(3):1612-9.

[4]. Blass G, et al. Chronic cathepsin inhibition by E-64 in Dahl salt-sensitive rats. Physiol Rep. 2016 Sep;4(17). pii: e12950.