β-Lapachone (ARQ-501;NSC-26326) is a naturally occurring O-naphthoquinone, acts as a topoisomerase I inhibitor, and induces apoptosis by inhibiting cell cycle progression.

β-Lapachone is a topoisomerase I inhibitor. β-Lapachone (25 μM) inhibits camptothecin-induced DNA cleavage^[1]. β-Lapachone (10-40 μM) significantly reduces the colony-forming ability of CHO cells, and is cytotoxic in S phase. β-Lapachone at above 10 μM, causes a heavy DNA-strand breaks in CHO cells^[2]. β-Lapachone (10 μM) suppresses JCPyV replication in IMR-32 cells. β-Lapachone (1.0 µM) potently affects JCPyV propagation in JCI cells. β-Lapachone (0.01-0.1 μM) inhibits VP1 production in JCI cells^[4].

Shanghai Jinpan Biotech Co Ltd has not independently confirmed the accuracy of these methods. They are for reference only.

β-Lapachone (0.066%) ameliorates cisplatin-induced renal injury and when in combination with cisplatin, the affect is more significant in mice. β-Lapachone increases Mre11-Rad50-Nbs1 (MRN) complex expression in mice^[3].

Shanghai Jinpan Biotech Co Ltd has not independently confirmed the accuracy of these methods. They are for reference only.

242.27

C₁₅H₁₄O₃

4707-32-8

β-拉帕醌

Room temperature in continental US; may vary elsewhere.

DMSO : 25 mg/mL (103.19 mM; Need ultrasonic)

Ethanol : 8.33 mg/mL (34.38 mM; Need ultrasonic)

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。

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 (10.32 mM); Clear solution

  此方案可获得 ≥ 2.5 mg/mL (10.32 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。

  将 0.9 g 氯化钠，完全溶解于 100 mL ddH₂O 中，得到澄清透明的生理盐水溶液

• 2.

  请依序添加每种溶剂： 10% DMSO    90% (20% SBE-β-CD in saline)

  Solubility: ≥ 2.5 mg/mL (10.32 mM); Clear solution

  此方案可获得 ≥ 2.5 mg/mL (10.32 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 900 μL 20% 的 SBE-β-CD 生理盐水水溶液中，混合均匀。

  将 2 g 磺丁基醚 β-环糊精加入 5 mL 生理盐水中，再用生理盐水定容至 10 mL，完全溶解，澄清透明
• 3.

  请依序添加每种溶剂： 10% DMSO    90% corn oil

  Solubility: ≥ 2.5 mg/mL (10.32 mM); Clear solution

  此方案可获得 ≥ 2.5 mg/mL (10.32 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。

• [1]. Li CJ, et al. beta-Lapachone, a novel DNA topoisomerase I inhibitor with a mode of action different from camptothecin. J Biol Chem. 1993 Oct 25;268(30):22463-8.

  [2]. Vanni A, et al. DNA damage and cytotoxicity induced by beta-lapachone: relation to poly(ADP-ribose) polymerase inhibition. Mutat Res. 1998 Jun 5;401(1-2):55-63.

  [3]. Kim TW, et al. β-Lapachone enhances Mre11-Rad50-Nbs1 complex expression in cisplatin-induced nephrotoxicity. Pharmacol Rep. 2016 Feb;68(1):27-31.

DNA topoisomerase I is incubated in the presence or absence of drugs (including β-Lapachone), in 20 μL of relaxation buffer (50 mM Tris (pH 7.5). 50 mM KCl, 10 mM MgCl₂, 0.5 mM dithiothreitol, 0.5 mM EDTA, 30 μg/mL bovine serum albumin) for 30 min at 37°C. Reactions are stopped by adding 1% SDS and proteinase K (50 μg/mL). After an additional 1-h incubation at 37°C, the products are separated by electrophoresis in 1% agarose gel in TAE buffer (0.04 M tris acetate, 0.001 M EDTA). The gel is stained with ethidium bromide after electrophoresis. The photographic negative is scanned with an NIH image analysis system^[1].

Shanghai Jinpan Biotech Co Ltd has not independently confirmed the accuracy of these methods. They are for reference only.

Cytotoxicity is measured by an MTT assay. IMR-32 and JCI cells are plated in 96-well microtiter plates at a concentration of 5.0 × 10⁴ (topotecan) or 2.5 × 10⁴ (β-lapachone) cells/well/100 µL medium 24 hr prior to addition of various concentrations of topotecan or β-lapachone. The cells are then incubated for 72 hr at 37°C in a CO₂ incubator. Cell proliferation is assessed using a Cell Proliferation Kit I. Experiments are performed using four independent cultures^[4].

Shanghai Jinpan Biotech Co Ltd has not independently confirmed the accuracy of these methods. They are for reference only.

Male Balb/c mice are provided a commercial pellet diet and water ad libitum. After 1 week of acclimation, the mice are randomly allocated to one of the following groups (5 per group): control, β-lapachone, cisplatin (18 mg/kg, ip), and β-lapachone + cisplatin (18 mg/kg, ip). The β-lapachone groups are fed a diet containing the drug (0.066) for 2 weeks prior to cisplatin injection. All mice are sacrificed under carbon dioxide anesthesia 3 days after cisplatin injection. The blood samples are subjected to serum BUN and CRE analyses. Half of the kidney is quickly removed for histopathological and immunohistochemical (IHC) studies. The other half is stored at −70°C until western blot assay^[3].

Shanghai Jinpan Biotech Co Ltd has not independently confirmed the accuracy of these methods. They are for reference only.

• [1]. Li CJ, et al. beta-Lapachone, a novel DNA topoisomerase I inhibitor with a mode of action different from camptothecin. J Biol Chem. 1993 Oct 25;268(30):22463-8.

  [2]. Vanni A, et al. DNA damage and cytotoxicity induced by beta-lapachone: relation to poly(ADP-ribose) polymerase inhibition. Mutat Res. 1998 Jun 5;401(1-2):55-63.

  [3]. Kim TW, et al. β-Lapachone enhances Mre11-Rad50-Nbs1 complex expression in cisplatin-induced nephrotoxicity. Pharmacol Rep. 2016 Feb;68(1):27-31.