PD-1 signaling pathway[1]

NP-12 TFA 对 PD-L1 和 PD-L2 表现出等价拮抗作用，从而促进淋巴细胞增殖及其执行效应器任务的能力 [1]。 NP-12 TFA 针对 rmPD-L1 和 rmPD-L2 的平均 EC50 值分别为 17 nM 和 16.6 nM，可恢复小鼠脾细胞检测系统中的增殖 [1]。此外，NP-12 TFA 已被证明可显着减轻重组人 PD-L1 和 PD-L2 介导的体外人 PBMC 增殖抑制，针对 PD-L1 和 PD-L2 的平均 EC50 值为 63.3 nM 和 44.1 nM ，分别[1]。

AUNP-12 抑制小鼠皮下注射的 B16F10 小鼠黑色素瘤细胞的 44% 肿瘤生长（5 mg/kg，皮下注射，每天一次，14 天）；它减少静脉注射 B16F10 细胞的肺转移。小鼠（5 mg/kg，皮下注射，每天一次，11 天）；将原位注射至小鼠乳腺脂肪垫的 4T1 细胞（3 mg/kg，皮下注射，每天一次，40 天）抑制 44% 的肿瘤生长。接受 AUNP-12 治疗的动物中，10% 的动物肿瘤生长完全消退，另外 10% 的动物肿瘤生长部分消退。安乐死后测量，AUNP-12治疗的动物的肺转移平均减少>60%。

AUNP-12 在使用表达 hPDL2 的 HEK293 细胞抑制 PD1 与 PD-L2 结合时显示 EC50 = 0.72 nM，在使用表达 hPDL1 的 MDA-MB231 细胞的大鼠外周血单核细胞 (PBMC) 增殖测定中显示 EC50 = 0.41 nM 。这与 AUNP-012 报道的“破坏 PD1-PDL1/2 相互作用的亚纳摩尔效力”很好地对应。

AUNP-12 在使用表达 hPDL2 的 HEK293 细胞抑制 PD1 与 PD-L2 结合时显示 EC50 = 0.72 nM，在使用表达 hPDL1 的 MDA-MB231 细胞的大鼠外周血单核细胞 (PBMC) 增殖测定中显示 EC50 = 0.41 nM 。

AUNP-12 is active in vivo in a lung metastasis model of B16F10 melanoma in mice, showing a 64% reduction in metastasis at 5 mg/kg (subcutaneous, once daily, 14 days).[2]

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Pharmacokinetics of AUNP-12 in Balb/c mice[3]
All animal experimental procedures used in these studies including pharmacokinetic, pharmacodynamic, and efficacy experiments were approved by the Institutional Animal Ethical Committee based on the Committee for the Purpose of Control and Supervision on Experiments on Animals (India) guidelines. AUNP-12 was administered either intravenously or subcutaneously to the animals at a dose of 3 mg/kg to determine the pharmacokinetic parameters using 5% dextrose water as formulation. After administration, blood samples were collected at regular intervals until 24 hours and centrifuged to obtain the plasma fraction. The plasma samples were processed by SPE method and the eluent were analyzed by LC/MS-MS to determine the plasma concentration of the compound. From intravenous administration, plasma concentration after injection (C0 minutes), the area under the concentration−time curve from time zero to infinity (AUC 0−∞), the mean residence time, volume of distribution (Vdss), and clearance (CL) for each mouse were obtained. The maximum plasma concentration (Cmax), time to reach maximum plasma concentration (Tmax), and AUC 0−∞ were obtained from subcutaneous administration of AUNP-12 . On the basis of the intravenous and subcutaneous parameters, bioavailability of AUNP-12 was calculated.

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Syngeneic mouse studies[3]
In all in vivo tumor growth inhibition (TGI) studies, tumor volumes were measured two times weekly using digital calipers and the volume was expressed in mm3 using the formula V = 0.5a × b2, where a and b are the long and short diameters of the tumor, respectively. Body weights and clinical signs were monitored twice a week. AUNP-12 was dissolved in 5% dextrose water for all the in vivo studies, except for B16F10 mouse melanoma and Renca tumor models where 1 × PBS was used. Fresh formulation was prepared every day. Compound and vehicle controls were dosed subcutaneously once a day at a dosing volume of 10 mL/kg body weight.

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[1]. US 2011/0318373 A1
[2]. Cancer Research, vol. 72, no. 8 Suppl. 1, Abstract 2850, 2012.
[3]. A Rationally Designed Peptide Antagonist of the PD-1 Signaling Pathway as an Immunomodulatory Agent for Cancer Therapy. Mol Cancer Ther. 2019 Jun;18(6):1081-1091.

Further in vivo studies revealed that AUNP-12/AUR-012 exhibits an excellent PK-PD correlation with sustained PD for >24 h. In preclinical models of melanoma, breast and kidney cancers, AUR012/AUNP-12 showed superior efficacy compared to therapeutic agents currently used in the clinic in inhibition of both primary tumor growth and metastasis. Interestingly, dosing once in three days was equally efficacious as once a day dosing with no signs of overt toxicity and generation of neutralizing activity.[9] Rescue of proliferation of immune cells analyzed upon stimulation with anti-CD3/anti-CD-28 indicated a complete rescue of CD4+ and CD8+ T cells. Interestingly, the proliferation of CD4+, Foxp3+ T cells was completely abolished with AUR-012/AUNP-12 treatment indicating a complete suppression of regulatory T cells. Sustained activation of circulatory immune cells and their ability to secrete IFN-γ up to 72 h indicate that pharmacodynamic effects persist even after the clearance of the compound in animal models, thus supporting a dosing interval of up to 3 days. In models of melanoma, breast, kidney and colon cancers, AUR-012/AUNP-12 showed efficacy in inhibition of both primary tumor growth and metastasis. Additionally, anti-tumor activity of the compound in a pre-established CT26 model correlated well with pharmacodynamic effects as indicated by intratumoral recruitment of CD4+ and CD8+ T cells, and a reduction in PD1+ T cells (both CD4+ & Page 7/12 CD8+) in tumor and blood. In 14-day repeated dose toxicity studies, AUR-012/AUNP-12 was well tolerated at 100 times the efficacious doses. [2]

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AUNP-12, likely to be identical to the compound previously known under the codenames Aur-012, Aurigene-012, or Aurigene NP-12, is an inhibitor of the so-called PD-1 pathway, and will be in development for several cancer indications. It is so far the only peptide therapeutic in this pathway and could offer more effective and safer combination opportunities compared to current approaches,[2-4] e.g. antibodies such as Nivolumab (BMS), Lambrolizumab (Merck-3475), CT-011 (Curetech), MDX-1105 (BMS), MPDL3280 (GNE) and MEDI-4736 (Medimmune-AZ), or Amplimmune’s PD-L2-FC fusion protein. PD-1, or Programmed cell death 1, is an immunoreceptor belonging to the CD28 family, and plays an important role in negatively regulating immune responses. The amino acid protein structure includes an extracellular amino acid IgV domain followed by a transmembrane region and an intracellular tail. PD-1 is expressed on the surface of activated T cells, B cells, and macrophages, and has two ligands, PD-L1 and PD-L2, which are members of the B7 family. PD-L1 is expressed on almost all murine tumor cell lines, whereas PD-L2 expression is more restricted and is expressed mainly by DCs and a few tumor lines. Blocking of PD-1 signaling pathways has been shown to result in restoration of defective immune cell functions in cancer and chronic infections. Recent advances in achieving highly durable clinical responses via inhibition of immune checkpoint proteins including PD-1 using antibodies or fusion proteins have revolutionized the outlook for cancer therapy. However, along with impressive clinical activity, severe immune-related adverse events (irAEs) due to the breaking of immune selftolerance are becoming increasingly evident. Sustained target inhibition as a result of a long halflife (>15-20 days) and >70% target occupancy for months are likely contributing to severe irAEs observed in the clinic with antibodies targeting immune checkpoint proteins.[2]

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Pioneering success of antibodies targeting immune checkpoints such as PD-1 and CTLA4 has opened novel avenues for cancer immunotherapy. Along with impressive clinical activity, severe immune-related adverse events (irAE) due to the breaking of immune self-tolerance are becoming increasingly evident in antibody-based approaches. As a strategy to better manage severe adverse effects, we set out to discover an antagonist targeting PD-1 signaling pathway with a shorter pharmacokinetic profile. Herein, we describe a peptide antagonist NP-12 that displays equipotent antagonism toward PD-L1 and PD-L2 in rescue of lymphocyte proliferation and effector functions. In preclinical models of melanoma, colon cancer, and kidney cancers, NP-12 showed significant efficacy comparable with commercially available PD-1-targeting antibodies in inhibiting primary tumor growth and metastasis. Interestingly, antitumor activity of NP-12 in a preestablished CT26 model correlated well with pharmacodynamic effects as indicated by intratumoral recruitment of CD4 and CD8 T cells, and a reduction in PD-1+ T cells (both CD4 and CD8) in tumor and blood. In addition, NP-12 also showed additive antitumor activity in preestablished tumor models when combined with tumor vaccination or a chemotherapeutic agent such as cyclophosphamide known to induce "immunologic cell death." In summary, NP-12 is the first rationally designed peptide therapeutic targeting PD-1 signaling pathways exhibiting immune activation, excellent antitumor activity, and potential for better management of irAEs.[3]

C142H226N40O48.C2HF3O2

3375.57

AUNP-12;1353563-85-5

White to off-white solid powder

(4S)-5-amino-4-[[(2S)-6-amino-2-[[(2S,3S)-2-[[(2S)-5-amino-2-[[(2S)-2-[[(2S)-6-amino-2-[[(2S)-1-[(2S)-2-[[(2S)-2-[[(2S)-5-amino-2-[[(2S,3R)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2,6-bis[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S,3R)-2-[[(2S)-4-amino-2-[[(2S)-2-amino-3-hydroxypropanoyl]amino]-4-oxobutanoyl]amino]-3-hydroxybutanoyl]amino]-3-hydroxypropanoyl]amino]-4-carboxybutanoyl]amino]-3-hydroxypropanoyl]amino]-3-phenylpropanoyl]amino]hexanoyl]amino]-3-phenylpropanoyl]amino]-5-carbamimidamidopentanoyl]amino]-3-methylbutanoyl]amino]-3-hydroxybutanoyl]amino]-5-oxopentanoyl]amino]-4-methylpentanoyl]amino]propanoyl]pyrrolidine-2-carbonyl]amino]hexanoyl]amino]propanoyl]amino]-5-oxopentanoyl]amino]-3-methylpentanoyl]amino]hexanoyl]amino]-5-oxopentanoic acid TFA

AUNP-12 TFA; 1353563-85-5; AUNP12 TFA; NP-12 TFA; CHEMBL4635204; AUNP-12, AUR-012 TFA; NONYLPHENOL POLYOXYETHYLENE ETHER; G13071 TFA

2934.99.9001

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。

Room temperature (This product is stable at ambient temperature for a few days during ordinary shipping and time spent in Customs)

May dissolve in DMSO (in most cases), if not, try other solvents such as H2O, Ethanol, or DMF with a minute amount of products to avoid loss of samples

注意: 如下所列的是一些常用的体内动物实验溶解配方，主要用于溶解难溶或不溶于水的产品（水溶度<1 mg/mL）。 建议您先取少量样品进行尝试，如该配方可行，再根据实验需求增加样品量。

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注射用配方1: DMSO : Tween 80： Saline = 10 : 5 : 85 (如： 100 μL DMSO → 50 μL Tween 80 → 850 μL Saline)
*生理盐水/Saline的制备：将0.9g氯化钠/NaCl溶解在100 mL ddH ₂ O中，得到澄清溶液。
注射用配方 2: DMSO : PEG300 ：Tween 80 : Saline = 10 : 40 : 5 : 45 (如： 100 μL DMSO → 400 μL PEG300 → 50 μL Tween 80 → 450 μL Saline)
注射用配方 3: DMSO : Corn oil = 10 : 90 (如： 100 μL DMSO → 900 μL Corn oil)
示例: 以注射用配方 3 (DMSO : Corn oil = 10 : 90) 为例说明, 如果要配制 1 mL 2.5 mg/mL的工作液, 您可以取 100 μL 25 mg/mL 澄清的 DMSO 储备液，加到 900 μL Corn oil/玉米油中, 混合均匀。

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注射用配方 4: DMSO : 20% SBE-β-CD in Saline = 10 : 90 [如：100 μL DMSO → 900 μL (20% SBE-β-CD in Saline)]
*20% SBE-β-CD in Saline的制备（4°C，储存1周）：将2g SBE-β-CD (磺丁基-β-环糊精) 溶解于10mL生理盐水中，得到澄清溶液。
注射用配方 5: 2-Hydroxypropyl-β-cyclodextrin : Saline = 50 : 50 (如： 500 μL 2-Hydroxypropyl-β-cyclodextrin (羟丙基环胡精)→ 500 μL Saline)
注射用配方 6: DMSO : PEG300 : Castor oil : Saline = 5 : 10 : 20 : 65 (如： 50 μL DMSO → 100 μL PEG300 → 200 μL Castor oil → 650 μL Saline)
注射用配方 7: Ethanol : Cremophor : Saline = 10： 10 : 80 (如： 100 μL Ethanol → 100 μL Cremophor → 800 μL Saline)
注射用配方 8: 溶解于Cremophor/Ethanol (50 : 50), 然后用生理盐水稀释。
注射用配方 9: EtOH : Corn oil = 10 : 90 (如： 100 μL EtOH → 900 μL Corn oil)
注射用配方 10: EtOH : PEG300：Tween 80 : Saline = 10 : 40 : 5 : 45 (如： 100 μL EtOH → 400 μL PEG300 → 50 μL Tween 80 → 450 μL Saline)

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口服配方 1: 悬浮于0.5% CMC Na (羧甲基纤维素钠)
口服配方 2: 悬浮于0.5% Carboxymethyl cellulose (羧甲基纤维素)
示例: 以口服配方 1 (悬浮于 0.5% CMC Na)为例说明, 如果要配制 100 mL 2.5 mg/mL 的工作液, 您可以先取0.5g CMC Na并将其溶解于100mL ddH2O中，得到0.5%CMC-Na澄清溶液；然后将250 mg待测化合物加到100 mL前述 0.5%CMC Na溶液中，得到悬浮液。

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口服配方 3: 溶解于 PEG400 (聚乙二醇400)
口服配方 4: 悬浮于0.2% Carboxymethyl cellulose (羧甲基纤维素)
口服配方 5: 溶解于0.25% Tween 80 and 0.5% Carboxymethyl cellulose (羧甲基纤维素)
口服配方 6: 做成粉末与食物混合

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注意: 以上为较为常见方法，仅供参考， InvivoChem并未独立验证这些配方的准确性。具体溶剂的选择首先应参照文献已报道溶解方法、配方或剂型，对于某些尚未有文献报道溶解方法的化合物，需通过前期实验来确定（建议先取少量样品进行尝试），包括产品的溶解情况、梯度设置、动物的耐受性等。

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请根据您的实验动物和给药方式选择适当的溶解配方/方案：
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；
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