A tale of tails: Sialidase is key to success in a model of phage therapy against K1-capsulated Escherichia coli.

A tale of tails: Sialidase is key to success in a model of phage therapy against K1-capsulated Escherichia coli.
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尾巴的故事:唾液酸酶是针对 K1 包膜大肠杆菌的噬菌体疗法模型取得成功的关键。

DOI:
10.1016/j.virol.2009.11.040
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发表时间:
2010-03-01
期刊:
影响因子:
3.7
通讯作者:
Molineux, I. J.
Molineux, I. J.
中科院分区:
医学3区
文献类型:
--
作者:
Bull, J. J.;Vimr, E. R.;Molineux, I. J.

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先前对感染大肠杆菌O18:K1:H7的小鼠的研究发现,需要K1胶囊感染的噬菌体(K1-dep)优于不依赖胶囊的噬菌体(K1-ind)。我们发现,三个K1-ind噬菌体在含血清的细胞上生长时都具有较低的适合度,而四个K1-dep噬菌体的适合度较高。区别是血清特定的,因为肉汤的适合性是重叠的。唾液酸酶活性与所有测试的K1-dep病毒粒子有关,但没有K1-ind病毒粒子,序列分析支持K1-ind病毒粒子的表型。在感染K1-IND噬菌体的细胞中加入内唾液酸酶,可增强吸附后的产生性感染,从而提高血清的适合性。我们认为,病毒粒子唾液酸酶活性是在血清中生长的细胞上高适应性的主要决定因素,因此在哺乳动物宿主中也是如此。尽管唾液酸酶的益处仅限于K1包裹的细菌,但这项研究可能为选择噬菌体用于治疗许多系统性感染提供科学依据。
Prior studies treating mice infected with Escherichia coli O18:K1:H7 observed that phages requiring the K1 capsule for infection (K1-dep) were superior to capsule-independent (K1-ind) phages. We show that three K1-ind phages all have low fitness when grown on cells in serum whereas fitnesses of four K1-dep phages were high. The difference is serum-specific, as fitnesses in broth overlapped. Sialidase activity was associated with all K1-dep virions tested but no K1-ind virions, a phenotype supported by sequence analyses. Adding endosialidase to cells infected with K1-ind phage increased fitness in serum by enhancing productive infection after adsorption. We propose that virion sialidase activity is the primary determinant of high fitness on cells grown in serum, and thus in a mammalian host. Although the benefit of sialidase is specific to K1-capsulated bacteria, this study may provide a scientific rationale for selecting phages for therapeutic use in many systemic infections.
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