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A bacterially expressed peptide prevents experimental infection ofprimates by the hepatitis E virus

机译:细菌表达的肽可防止戊型肝炎病毒对灵长类动物进行实验性感染

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摘要

A 23 kDa peptide of the major structural protein of the hepatitis E virus (HEV) expressed in E. coli was found to naturally interact with one another to form homodimers and the peptide was recognized strongly in its dimeric form by HEV reactive human sera. To determine if the peptide may confer protection against HEV infection, three monkeys were immunized with the purified peptide and three were given placebo. Both groups of animals were challenged with 10(5) genome equivalent dose of the homologous strain of HEV. All control animals excreted the virus for 10-12 days beginning 5 days after the infection. The viral genome was also present in the peripheral blood monocyte (PBMC) samples from two animals, but it was not detected in the plasma samples from any of the animals. The infection in two control animals was accompanied by HEV seroconversion. Immunization was found to abrogate HEV stool excretion in two animals and reduced the viral excretion to one day in the third. None of the immunized animals showed detectable HEV in plasma or PBMC samples nor did the animals showed evidence of HEV seroconversion. These results suggested that immunization with the bacterially expressed peptide may prevent experimental infection of primates with the homologous strain of HEV.
机译:发现在大肠杆菌中表达的E型肝炎病毒(HEV)主要结构蛋白的23 kDa肽可以自然地彼此相互作用形成同型二聚体,并且该肽被HEV反应性人血清以其二聚体形式强烈识别。为了确定该肽是否可以赋予抗HEV感染的保护,用纯化的肽免疫了三只猴子,并给了三只安慰剂。两组动物均接受10(5)基因组当量剂量的HEV同源株攻击。从感染后5天开始,所有对照动物将病毒排泄10-12天。病毒基因组也存在于两只动物的外周血单核细胞(PBMC)样本中,但在任何一只动物的血浆样本中均未检测到。在两只对照动物中的感染伴随着HEV血清转化。发现免疫可以消除两只动物的HEV粪便排泄,而第三只动物的病毒排泄减少到一天。免疫动物均未在血浆或PBMC样品中显示可检测到的HEV,也未显示HEV血清转化的证据。这些结果表明,用细菌表达的肽进行免疫可以防止实验动物感染灵长类动物的HEV同源株。

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