NA/neuraminidase（IC50 = 0.9-4.3 nM)[2]

细胞培养中的抗病毒活性[2]
使用0.32至100μM的剂量联合评估了奥司他韦羧酸盐和帕拉米韦对MDCK细胞培养中病毒产量的抑制作用（表1）。单独使用奥司他韦羧酸盐在100μM时将病毒产量降低了4.4log10。32和100μM的培拉米韦使病毒产量比检测限低≥5 log10。在三种特定条件下，当10μM奥司他韦羧酸盐与3.2或10μM帕拉米韦联合使用，并使用每种抑制剂3.2μM的组合时，发现病毒滴度比预期抑制了10倍以上。图1显示了显示高于和低于预期值的数据的三维MacSynergy图。1至10μM奥司他韦和1至10微米帕拉米韦之间存在明显的协同作用区域，协同作用体积为9.1。当0.32μM帕拉米韦与3.2-32μM奥司他韦羧酸盐联合使用时，出现了轻微拮抗区域，计算出的拮抗体积为-1.7。整个表面的净效应为7.4的协同体积。

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病毒神经氨酸酶抑制研究[2]
表2列出了奥司他韦羧酸盐和帕拉米韦组合对神经氨酸酶活性的影响。在10nM奥司他韦羧酸盐治疗或1-10nM帕拉米韦治疗的情况下，神经氨酸酶活性最低。大多数低剂量组合（0.01至3.2 nM奥司他韦羧酸盐与0.01至0.32 nM帕拉米韦组合）比单独使用任何一种化合物都能产生更大的抑制作用。组合使用的每种抑制剂的浓度较高（0.32至10 nM）导致的抑制作用比预期的要小。这是在一个单独使用帕拉米韦对酶活性具有高度抑制作用的区域，药物组合进一步抑制的潜力不大。数据的三维MacSynergy图如图2所示。组合的增加或减少百分比很小。低剂量组合区域的协同作用体积为86（中度协同作用），而高剂量联合区域的拮抗作用体积为-65（中度拮抗作用），整个表面的净效应为21（无差异）。

帕拉米韦可以保护小鼠免受高致病性禽流感感染后的严重疾病后果，多剂量治疗对雪貂有效。帕拉米韦与奥司他韦联合治疗小鼠流感感染的效果优于单独使用每种化合物的次优剂量。帕拉米韦 (30 mg/kg) 可有效促进感染系统复制 H5N1 病毒的小鼠的存活。 0.5 mg/kg/d 的帕拉米韦对小鼠的 H1N1 病毒有 30% 的保护作用，但在较低剂量下作为单一疗法时无效。当 0.025 mg/kg/d、0.05 mg/kg/d 和 0.1 mg/kg/d 剂量的帕拉米韦与 20 mg/kg/d 法匹拉韦联用时，帕拉米韦与法匹拉韦联用可使幸存者数量增加 10-50%当所有剂量的帕拉米韦与 40 mg/kg/d 法维匹拉韦联合使用时。帕拉米韦联合法匹拉韦可延长 H1N1 感染小鼠的寿命，改善体重，并显着降低肺出血评分和肺重量。帕拉米韦 (1 mg/kg/d) 联合金刚乙胺 (5 mg/kg/d 和 10 mg/kg/d) 分别产生 1.69 和 0.69 的体重减轻，而 3.0 mg/kg/d 帕拉米韦 (3.0 mg/kg/d) 联合 10在亚致死甲型流感 (H3N2) 病毒小鼠模型中，30 mg/kg/d 金刚乙胺未显示任何体重减轻。

病毒神经氨酸酶抑制试验[2]
按照制造商的说明，使用市售试剂盒在96孔实心白色微孔板中测定化合物对病毒神经氨酸酶活性的影响，如前所述（Smee等人，2010）。将半对数稀释增量的化合物与病毒（作为神经氨酸酶的来源）一起孵育。每个微孔中A/NWS/33（H1N1）流感病毒的量约为500细胞培养感染剂量。在加入化学发光底物之前，将板在37°C下预孵育10分钟。加入底物后，将平板在37°C下孵育30分钟。在加入NA Star®加速剂溶液后，立即使用Centro LB 960光度计（Berthold Technologies，Oak Ridge，TN）评估神经氨酸酶活性0.5秒。每种化合物浓度下的化学发光计数百分比基于在未处理条件下归一化为100%的计数。

细胞培养抗病毒研究[2]
在MDCK细胞的融合培养中测定了羧酸奥司他韦和帕拉米韦的抗病毒活性。通过在培养三天后量化病毒产量，在感染了约50%细胞培养感染剂量（CCID50）病毒的96孔微孔板中进行了检测。样品板在-80°C下冷冻。随后，将两个微孔中的培养基合并，用于制备滴定样品。每种抑制剂浓度下的病毒产量是通过终点稀释法（Reed和Muench，1938）在96孔微孔板中的新鲜MDCK细胞单层上滴定样品（以10倍稀释增量）来确定的，每次稀释使用4个微孔。在感染后3天和6天检查微孔板是否存在病毒细胞病理学。病毒滴度表示为log10CCID50/0.1ml。

Animal experiment design[2]
Female BALB/c mice (18-20 g) were anesthetized by i.p. injection of ketamine (100 mg/kg) followed by intranasal infection with a 50-μl suspension of influenza virus; the infection inoculation of approximately 104.5 CCID50/mouse equaled three 50% mouse lethal challenge doses (MLD50). Compounds were administered p.o. (oseltamivir) by gavage or i.m. (peramivir) twice a day at 12-hour intervals for 5 days starting 2 hours before virus challenge. Placebo-treated mice received both p.o. and i.m. treatments. Ten drug-treated infected mice and 10 placebo-treated controls were observed daily for death through 21 days. Mice that died during the treatment phase were excluded from the total count. Body weights were determined every other day.

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Pharmacokinetic (PK) analysis[1]
PK data was obtained in ferrets and mice, as follows . Male ferrets (three per group) were injected via i.m. route with a dose of 1, 3 or 9 mg/kg peramivir. Prior to dosing (time 0) and at time intervals between 0.083 and 72 hrs following dosing, blood samples of approximately 0.5 ml were collected and analyzed via liquid chromatography with tandem mass spectrophotometry (LS/MS/MS). Mice PK data were generated based upon modeling from a 10 mg/kg i.m. dose. PK parameters were calculated and modeling performed using WinNonlin® 5.0.1. PK data were obtained following a single i.m. injection of ferrets (3 per group) with doses of 1, 3 or 9 mg/kg peramivir. Animals were monitored for peramivir concentration in plasma over a 72 hour period.

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Mice[1]
Ten-week-old mice (10-11 per group) were infected intranasally with a dose of 6 × 102 TCID50 of influenza A H5N1 (A/Vietnam/1203/04) grown in MDCK cells. Subsequently, mice were treated with peramivir (30 mg/kg) in a single dose at 1 h post-inoculation (+1 h) or multiple doses (+1 h, daily on day +1 through day +4) via i.m. injection. As control, mice were treated with drug diluent (“vehicle” at +1 h, daily on day +1 through day +4. For comparison, mice were treated orally (per os, p.o.) with oseltamivir (10 mg/kg/day) at +1 h and daily on day +1 through day +4. Animals were monitored daily for a period of 15 days for death, disease development, and body temperature. Body mass (weight) was recorded on days indicated in figure legend. Severe disease was defined as the loss of ≥20% of their initial body mass.

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Ferrets[1]
Six- to eight-week-old ferrets were infected intranasally with 1.5 × 103 TCID50 (trial 1), 1.5 × 104 TCID50 (trial 2), or 1.7 × 104 TCID50 of influenza A H5N1 (A/Vietnam/1203/04) using virus stock prepared in MDCK cells (trial 1) or in eggs (trial 2 and 3). Ferrets were then treated with multiple doses of peramivir (30 mg/kg) or, as control, were treated with vehicle at +1 h, and daily on day +1 through day +4 (trial 1 and 3) or were untreated (trial 2). Following infection and drug treatment, animals were monitored daily for a period of 16-18 days following infection for death and disease development. Daily telemetric monitoring of body temperature was performed. For trial 3, five animals per group were randomly pre-selected to be euthanized on day 4 and on day 6 post-infection for organ harvest and infectious virus titration.

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0.025 mg/kg/d, 0.05 mg/kg/d, and 0.1 mg/kg/d

Mice

The post-exposure therapeutic efficacy of peramivir was also evaluated in outbred animals (ferrets), as pharmacokinetic analysis of peramivir in ferrets showed rapid uptake into the circulation following i.m. inoculation. Pharmacokinetic analysis indicated that the parenteral formulation of peramivir was rapidly introduced into the circulation of these mice following intramuscular inoculation. https://pmc.ncbi.nlm.nih.gov/articles/PMC2680697/

Hepatotoxicity
Despite widespread use, there is little evidence that peramivir, when given as recommended as a single intravenous infusion, is associated with liver injury, either in the form of serum enzyme elevations or clinically apparent liver disease. A proportion of patients with influenza may have minor serum enzyme elevations during the acute illness, but these appear to be independent of therapy and are not exacerbated by peramivir.
Likelihood score: E (unlikely cause of clinically apparent liver injury).

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Effects During Pregnancy and Lactation
◉ Summary of Use during Lactation
Because peramivir is poorly absorbed orally, it is not likely to reach the bloodstream of the infant in clinically important amounts. However, because no information is available on the use of peramivir breastfeeding, an alternate drug may be preferred, especially while nursing a newborn or preterm infant.
◉ Effects in Breastfed Infants
Relevant published information was not found as of the revision date.
◉ Effects on Lactation and Breastmilk
Relevant published information was not found as of the revision date.

[1]. Virology.2008 Apr 25;374(1):198-209;
[2]. Antiviral Res.2010 Oct;88(1):38-44;
[3]. Antiviral Res.2008 Nov;80(2):150-7.

Peramivir is an antiviral agent developed by Biocryst Pharmaceuticals to treat influenza A/B. The development of peramivir has been supported by the US Department of Health and Human Services as part of the government's effort to prepare for a flu pandemic. Being an influenza virus neuraminidase inhibitor, peramivir works by preventing new viruses from emerging from infected cells. Due to the poor oral bioavailability, the oral formulation of the drug was previously abandoned by Johnson and Johnson Company. The injectable intravenous formulation of peramivir was approved by the FDA in September 2017 for the treatment of acute uncomplicated influenza to pediatric patients 2 years and older who have been symptomatic for no more than two days.
Peramivir is a Neuraminidase Inhibitor. The mechanism of action of peramivir is as a Neuraminidase Inhibitor.
Peramivir is an inhibitor of the influenza neuraminidase enzyme and is used as therapy of acute symptomatic influenza A and B. Peramivir has not been associated with serum enzyme elevations during therapy or with clinically apparent liver injury.
Peramivir is a cyclopentane derivative with activity against influenza A and B viruses. Peramivir is a neuraminidase inhibitor which prevents normal processing of virus particles such that virus particles are not released from infected cells.

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Drug Indication
Peramivir is indicated for the treatment of acute uncomplicated influenza in patients six months and older who have been symptomatic for no more than two days.
FDA Label
Alpivab is indicated for the treatment of uncomplicated influenza in adults and children from the age of 2 years.
Treatment of influenza

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Mechanism of Action
Peramivir is an inhibitor of influenza neuraminidase, preventing new virus particles from leaving infected cells.

C15H28N4O4.3H2O

382.45

382.242

C, 47.11; H, 8.96; N, 14.65; O, 29.28

1041434-82-5

Peramivir;330600-85-6

11954371

White to off-white solid powder

1.698

179.71

8

8

7

26

460

5

CCC(CC)[C@@H]([C@H]1[C@@H](C[C@@H]([C@H]1O)C(=O)O)N=C(N)N)NC(=O)C.O.O.O

RFUCJKFZFXNIGB-ZBBHRWOZSA-N

InChI=1S/C15H28N4O4.3H2O/c1-4-8(5-2)12(18-7(3)20)11-10(19-15(16)17)6-9(13(11)21)14(22)23;;;/h8-13,21H,4-6H2,1-3H3,(H,18,20)(H,22,23)(H4,16,17,19);3*1H2/t9-,10+,11+,12-,13+;;;/m0.../s1

(1S,2S,3R,4R)-3-((S)-1-acetamido-2-ethylbutyl)-4-guanidino-2-hydroxycyclopentanecarboxylic acid trihydrate

BCX-1812,RWJ-270201, S-021812; BCX1812; BCX 1812; RWJ 270201; RWJ270201; Peramivir trihydrate; 1041434-82-5; Peramivir (trihydrate); Peramivir hydrate; Peramivir [USAN]; Rapiacta; QW7Y7ZR15U; Peramivir hydrate (JAN); Peramivir. Brand name: Rapivab; Rapiacta and Peramiflu

2934.99.9001

Powder      -20°C    3 years

                     4°C     2 years

In solvent   -80°C    6 months

                  -20°C    1 month

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

5%TFA : ~3 mg/mL
H2O : ~5 mg/mL (~13.07 mM)
DMSO : ~0.2 mg/mL ( ~0.52 mM)

配方 1 中的溶解度: 4.55 mg/mL (11.90 mM) in PBS (这些助溶剂从左到右依次添加，逐一添加), 澄清溶液; 超声助溶。 (<60°C).

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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；
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;
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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。