Variant enterovirus A71 found in immune-suppressed patient binds to heparan sulfate and exhibits neurotropism in B-cell-depleted mice.

Variant enterovirus A71 found in immune-suppressed patient binds to heparan sulfate and exhibits neurotropism in B-cell-depleted mice.
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在免疫抑制患者中发现的变体肠病毒A71与硫酸乙酰肝素结合,并在B细胞耗尽的小鼠中表现出神经性。

DOI:
10.1016/j.celrep.2023.112389
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发表时间:
2023-04-25
期刊:
影响因子:
8.8
通讯作者:
--
中科院分区:
生物学1区
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--
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肠道病毒 A71 (EV-A71) 会导致手足口病暴发,并伴有神经系统并发症和死亡。我们之前在一名免疫功能低下患者的粪便、脑脊液和血液中分离出 EV-A71 变异体,该患者的 VP1 衣壳蛋白被亮氨酸替换为精氨酸,导致硫酸肝素结合增加。我们在这里表明,这种突变增加了病毒在 B 细胞耗尽的口腔感染小鼠中的致病性,从而模拟了患者的免疫状态,并增加了对中和抗体的敏感性。然而,具有更大硫酸肝素亲和力的双突变体并不致病,这表明硫酸肝素亲和力增加可能会捕获外周组织中的病毒粒子并降低神经毒力。这项研究揭示了具有硫酸肝素 (HS) 结合能力的变异体在 B 细胞免疫力下降的个体中致病性增加。在免疫功能低下的患者中检测到肠道病毒 A71 VP1 衣壳蛋白中的 L97R 取代,赋予硫酸乙酰肝素结合能力。翁等人。证明具有这种突变的变体,尽管对宿主中和抗体的敏感性增加,但在口腔感染的免疫抑制小鼠中更具毒性。
Enterovirus A71 (EV-A71) causes hand, foot, and mouth disease outbreaks with neurological complications and deaths. We previously isolated an EV-A71 variant in the stool, cerebrospinal fluid, and blood of an immunocompromised patient who had a leucine-to-arginine substitution on the VP1 capsid protein, resulting in increased heparin sulfate binding. We show here that this mutation increases the virus’s pathogenicity in orally infected mice with depleted B cells, which mimics the patient’s immune status, and increases susceptibility to neutralizing antibodies. However, a double mutant with even greater heparin sulfate affinity is not pathogenic, suggesting that increased heparin sulfate affinity may trap virions in peripheral tissues and reduce neurovirulence. This research sheds light on the increased pathogenicity of variant with heparin sulfate (HS)-binding ability in individuals with decreased B cell immunity. A L97R substitution in the VP1 capsid protein of enterovirus A71, conferring heparan sulfate binding ability, was detected in an immunocompromised patient. Weng et al. demonstrate that variants with this mutation, despite increased susceptibility to host neutralizing antibodies, are more virulent in orally infected immunosuppressed mice.
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