A single dose of antibody-drug conjugate cures a stage 1 model of African trypanosomiasis

A single dose of antibody-drug conjugate cures a stage 1 model of African trypanosomiasis
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单剂抗体药物偶联物治愈非洲锥虫病第一阶段模型

DOI:
10.1101/547208
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发表时间:
2019
期刊:
--
影响因子:
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通讯作者:
MacGregor P
MacGregor P
中科院分区:
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文献类型:
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作者:
MacGregor P

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人类和牲畜感染非洲锥虫是用几十年前推出的药物治疗的,这些药物并不总是完全有效,而且往往有严重的副作用。在这里,锥虫触珠蛋白-血红蛋白受体(HpHbR)已被开发作为抗体-药物缀合物(ADC)的摄取途径,该抗体-药物缀合物在标准小鼠感染模型中对布氏锥虫完全有效。分离重组人抗HpHbR单克隆抗体,并显示其以受体依赖性方式内化。将抗体与吡咯并苯并二氮杂(PBD)毒素结合,并在皮摩尔浓度下体外杀死布氏锥虫。单次治疗剂量(0.25mg/kg)的HpHbR抗体-PBD缀合物在2天内完全治愈布氏锥虫感染,在随后的77天时间过程中没有感染的重新出现。这些实验展示了如何利用ADC来治疗迫切需要新疗法的原生动物疾病。
Infections of humans and livestock with African trypanosomes are treated with drugs introduced decades ago that are not always fully effective and often have severe side effects. Here, the trypanosome haptoglobin-haemoglobin receptor (HpHbR) has been exploited as a route of uptake for an antibody-drug conjugate (ADC) that is completely effective againstTrypanosoma bruceiin the standard mouse model of infection. Recombinant human anti-HpHbR monoclonal antibodies were isolated and shown to be internalised in a receptor-dependent manner. Antibodies were conjugated to a pyrrolobenzodiazepine (PBD) toxin and killedT.brucei in vitroat picomolar concentrations. A single therapeutic dose (0.25 mg/kg) of a HpHbR antibody-PBD conjugate completely cured aT.bruceimouse infection within 2 days with no re-emergence of infection over a subsequent time course of 77 days. These experiments provide a demonstration of how ADCs can be exploited to treat protozoal diseases that desperately require new therapeutics.
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