Early-life heterologous rhinovirus infections induce an exaggerated asthma-like phenotype.

Early-life heterologous rhinovirus infections induce an exaggerated asthma-like phenotype.
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DOI:
10.1016/j.jaci.2020.03.039
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发表时间:
2020-09
期刊:
The Journal of allergy and clinical immunology
影响因子:
--
通讯作者:
Hershenson MB
Hershenson MB
中科院分区:
其他
文献类型:
--
作者:
Rajput C;Han M;Ishikawa T;Lei J;Jazaeri S;Bentley JK;Hershenson MB

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生命早期由鼻病毒(RV)引起的喘息相关呼吸道感染是哮喘发展的危险因素。婴儿每年感染许多不同的RV毒株。我们之前的研究表明,RV感染6日龄BALB/c小鼠可诱导依赖于2型先天淋巴样细胞(ILC2s)的粘膜化生表型。我们假设早期RV感染改变了对随后异源感染的反应,诱导了一种夸张的哮喘样表型。野生型BALB/c小鼠和缺乏ILC2s的Rorafl/ flil7rre小鼠按如下方法处理:1)假手术第6天+假手术第13天;2)第6天RV-A1B +第13天假手术;3)第6天sham +第13天RV-A2;4)第6天RV-A1B +第13天RV-A2。感染RV-A1B的小鼠在出生第6天和假手术第13天显示BAL嗜酸性粒细胞和IL-13 mRNA表达增加,但没有IFN-γ mRNA表达增加,表明2型免疫反应,而感染假手术第6天和感染RV-A2的小鼠在出生第13天显示IFN-γ表达增加,这是一种成熟的抗病毒反应。相比之下,在第13天感染RV-A2之前,感染RV-A1B的小鼠在第6天出现嗜酸性粒细胞增加,IL-13、IL-5、Gob5、Muc5b和Muc5ac mRNA表达增加,产生IL-13的ILC2s扩增,粘液化生和气道高反应性加剧。与Rorafl/fl小鼠相比,Rorafl/ flil7rre小鼠显示BAL嗜酸性粒细胞和粘膜化生完全抑制。早期RV感染改变了对后续异源感染的反应,诱导依赖ILC2s的哮喘样表型增强。早期患有鼻病毒(RV)的喘息与哮喘有关,婴儿感染了许多RV毒株。未成熟小鼠的RV感染改变了对随后异源感染的免疫反应,引起夸大的哮喘样表型。
Early-life wheezing-associated respiratory tract infection by rhinovirus (RV) is a risk factor for asthma development. Infants are infected with many different RV strains per year. We previously showed that RV infection of 6 day-old BALB/c mice induces a mucous metaplasia phenotype which is dependent on type 2 innate lymphoid cells (ILC2s). We hypothesized that early-life RV infection alters the response to subsequent heterologous infection, inducing an exaggerated asthma-like phenotype. Wild type BALB/c mice and Rorafl/flIl7rcre mice lacking ILC2s were treated as follows: 1) day 6 of life sham + day 13 of life sham; 2) day 6 RV-A1B + day 13 sham; 3) day 6 sham + day 13 RV-A2; and 4) day 6 RV-A1B + day 13 RV-A2. Mice infected with RV-A1B at 6 days and sham at 13 days showed increased BAL eosinophils and mRNA expression of IL-13 but not IFN-γ, indicative of a type 2 immune response, whereas mice infected with sham on day 6 and RV-A2 on day 13 of life demonstrated increased IFN-γ expression, a mature antiviral response. In contrast, mice infected RV-A1B on day 6 prior to RV-A2 infection on day 13 showed increased eosinophils, mRNA expression of IL-13, IL-5, Gob5, Muc5b and Muc5ac, expansion of IL-13-producing ILC2s and exaggerated mucus metaplasia and airways hyperresponsiveness. Rorafl/flIl7rcre mice showed complete suppression of BAL eosinophils and mucous metaplasia compared to Rorafl/fl mice. Early-life RV infection alters the response to subsequent heterologous infection, inducing intensified asthma-like phenotype which is dependent on ILC2s. Early-life wheezing with rhinovirus (RV) is associated with asthma, and infants are infected with many RV strains. RV infection of immature mice alters the immune response to subsequent heterologous infection, causing an exaggerated asthma-like phenotype.
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