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Research Grade Anti-RSV F/Fusion glycoprotein F0 (32.4K)

2023-07-27 11:22 作者:AtaGenix-普健生物  | 我要投稿

呼吸道合胞病毒(respiratory syncytial virus,RSV)感染是一个全球性的健康问题,目前临床上仍缺乏特异的治疗手段。接种疫苗主动免疫预防或使用抗体制剂被动免疫预防是避免重症感染和减少死亡的重要措施。针对不同的人群,须研制不同类型的RSV疫苗:减毒活疫苗对婴儿来说,可能是最佳选择;亚单位疫苗有引起增强型呼吸道疾病的风险,不适合RSV血清学阴性的婴幼儿接种,主要适用于老年人和孕妇。研发安全且有效的RSV疫苗难度大,虽然已有30余种RSV疫苗进入临床研究阶段,并显示出应用潜力,其中F纳米颗粒疫苗已率先进入Ⅲ期临床试验,但在老年人和孕妇中未达预期效果。在RSV流行季节前,使用特异性抗体制剂也是预防高危人群严重RSV感染性疾病的有效手段。长效单克隆抗体MEDI8897比帕利珠单抗更具成本效益,已进入Ⅲ期临床试验,且获得优先研发资格。多克隆免疫球蛋白RI-002已在免疫缺陷人群中显示出较好的预防效果,具有进一步研发的现实意义。

货号:DVV02820

产品链接:http://www.antibodysystem.com/product/9573.html

物种反应性:Human respiratory syncytial virus A (strain A2)

形式:Liquid

存储缓冲区:0.01M PBS, pH 7.4.

浓度:1 mg/ml

纯度:>95% by SDS-PAGE.

克隆性:Monoclonal

应用:Research Grade Biosimilar

储存:Use a manual defrost freezer and avoid repeated freeze-thaw cycles.Store at +4°C short term (1-2 weeks).Store at -20 °C 12 months. Store at -80°C long term.

参考文献:

Complete nucleotide sequence of alfalfa mosaic virus RNA3. PMID: 6856479
Alterations in protein synthesis in the cyanobacterium Synechococcus sp. strain PCC 6301 in response to Calendula micrantha extract with molluscicidal activity. PMID: 7498056

Respiratory Syncytial Virus Attachment Glycoprotein Contribution to Infection Depends on the Specific Fusion Protein. PMID: 26468535
Surfactant protein A binds to the fusion glycoprotein of respiratory syncytial virus and neutralizes virion infectivity. PMID: 10558959
Virus-specific CD8+ T lymphocytes downregulate T helper cell type 2 cytokine secretion and pulmonary eosinophilia during experimental murine respiratory syncytial virus infection. PMID: 9236194
Meeting report VLPNPV: Session 3: Immune responses. PMID: 25529229
Mucosal Delivery of Recombinant Vesicular Stomatitis Virus Vectors Expressing Envelope Proteins of Respiratory Syncytial Virus Induces Protective Immunity in Cotton Rats. PMID: 33408176
Replication-competent or attenuated, nonpropagating vesicular stomatitis viruses expressing respiratory syncytial virus (RSV) antigens protect mice against RSV challenge. PMID: 11602747
Virus-specific memory and effector T lymphocytes exhibit different cytokine responses to antigens during experimental murine respiratory syncytial virus infection. PMID: 8985399
Development of nested PCR assays for detection of bovine respiratory syncytial virus in clinical samples. PMID: 7814551
Respiratory syncytial virus F and G proteins induce interleukin 1alpha, CC, and CXC chemokine responses by normal human bronchoepithelial cells. PMID: 20205592
Protection of cotton rats against human respiratory syncytial virus by vaccination with a novel chimeric FG glycoprotein. PMID: 2677234
[Development of PCR tests for the detection of bovine herpesvirus-1, bovine respiratory syncytial viruses and pestiviruses]. PMID: 7817501

帕利珠单抗靶向RSV的F蛋白表位Ⅱ,是第一个用来预防RSV相关ALRI的特异性单克隆抗体,早在1998年就获得美国食品药品监督管理局(Food and Drug Administration,FDA)的批准用于临床。一般在当地RSV感染流行前1月开始,每月肌注1次帕利珠单抗,每次15 mg/kg,最多5次。帕利珠单抗需多次注射,影响接受度,且其费用昂贵,仅推荐给高风险婴儿和儿童使用。使用靶向单一表位的单克隆抗体可能诱导免疫逃逸突变毒株,美国、日本、加拿大等国家均已监测到对帕利株单抗耐药的突变株,且有增多的流行趋势,这无疑给RSV的预防增加了新的困难。需要注意的是,已有研究提示帕利珠单抗对RSV感染的治疗无效

MEDI8897又称为尼司维单抗(nirsevimab),有可能弥补帕利株单抗需多次注射的短处,它源自D25的重组人免疫球蛋白G1κ单克隆抗体,靶向融合前F蛋白Ø表位,通过修饰Fc结构域,可延长其血清半衰期。

ALX0171靶向RSV的F蛋白表位Ⅱ,在体外和棉鼠体内均能明显阻断RSV的复制,是目前研发的首个雾化吸入型纳米单克隆抗体,有望用于临床治疗。最新一项Ⅱb期临床试验把1~24月龄因RSV-ALRI住院的患儿随机分为4组,分别雾化吸入低(3 mg/kg)、中(6 mg/kg)、高(9 mg/kg)3种剂量的ALX0171及安慰剂,结果显示ALX0171具有明显的抗病毒活性,但在改善临床症状(全球严重度评分、呼吸窘迫、氧饱和度、喂养耐受等)方面无明显疗效,这提示一旦发生了RSV-ALRI,针对RSV的抗病毒药物可能无法改善临床进程,减轻RSV感染的危害重在预防

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