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Co‐infection of respiratory bacterium with severe acute respiratory syndrome coronavirus induces an exacerbated pneumonia in mice

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Co‐infection of respiratory bacterium with severe acute respiratory syndrome coronavirus induces an exacerbated pneumonia in mice

Auteurs : Yasushi Ami ; Noriyo Nagata ; Kazuya Shirato ; Rie Watanabe ; Naoko Iwata ; Keiko Nakagaki ; Shuetsu Fukushi ; Masayuki Saijo ; Shigeru Morikawa ; Fumihiro Taguchi

Source :

Microbiology and Immunology [ 0385-5600 ] ; 2008.

RBID : PMC:7168413

Abstract

ABSTRACT

SARS‐CoV grows in a variety of tissues that express its receptor, although the mechanism for high replication in the lungs and severe respiratory illness is not well understood. We recently showed that elastase enhances SARS‐CoV infection in cultured cells, which suggests that SARS development may be due to elastase‐mediated, enhanced SARS‐CoV infection in the lungs. To explore this possibility, we examined whether co‐infection of mice with SARS‐CoV and Pp, a low‐pathogenic bacterium which elicits elastase production in the lungs, induces exacerbation of pneumonia. Mice co‐infected with SARS‐CoV and Pp developed severe respiratory disease with extensive weight loss, resulting in a 33∼90% mortality rate. Mice with exacerbated pneumonia showed enhanced virus infection in the lungs and histopathological lesions similar to those found in human SARS cases. Intranasal administration of LPS, another elastase inducer, showed an effect similar to that of Pp infection. Thus, this study shows that exacerbated pneumonia in mice results from co‐infection with SARS‐CoV and a respiratory bacterium that induces elastase production in the lungs, suggesting a possible role for elastase in the exacerbation of pneumonia.

Url:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7168413

DOI: 10.1111/j.1348-0421.2008.00011.x
PubMed: NONE
PubMed Central: 7168413

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PMC:7168413

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 a low‐pathogenic bacterium which elicits elastase production in the lungs, induces exacerbation of pneumonia. Mice co‐infected with SARS‐CoV and <italic>Pp</italic>
 developed severe respiratory disease with extensive weight loss, resulting in a 33∼90% mortality rate. Mice with exacerbated pneumonia showed enhanced virus infection in the lungs and histopathological lesions similar to those found in human SARS cases. Intranasal administration of LPS, another elastase inducer, showed an effect similar to that of <italic>Pp</italic>
 infection. Thus, this study shows that exacerbated pneumonia in mice results from co‐infection with SARS‐CoV and a respiratory bacterium that induces elastase production in the lungs, suggesting a possible role for elastase in the exacerbation of pneumonia.</p>
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<alt-title alt-title-type="right-running-head">Mouse SARS by SARS‐CoV and <italic>Pp</italic>
 Infection</alt-title>
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National Institute of Infectious Diseases, Murayama Branch, 4‐7‐1 Gakuen, Musashi‐Murayama, Tokyo 208‐0011, Japan</aff>
<author-notes><corresp id="correspondenceTo"><bold>Correspondence</bold>
 Fumihiro Taguchi, Department of Virology III, Division of Respiratory Virus Diseases, National Institute of Infectious Diseases, 4‐7‐1 Gakuen, Musashi‐Murayama, Tokyo 208‐0011, Japan. Tel: +81‐42‐561‐0771 (ext. 533); email: <email>ftaguchi@nih.go.jp</email>
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<p>SARS‐CoV grows in a variety of tissues that express its receptor, although the mechanism for high replication in the lungs and severe respiratory illness is not well understood. We recently showed that elastase enhances SARS‐CoV infection in cultured cells, which suggests that SARS development may be due to elastase‐mediated, enhanced SARS‐CoV infection in the lungs. To explore this possibility, we examined whether co‐infection of mice with SARS‐CoV and <italic>Pp,</italic>
 a low‐pathogenic bacterium which elicits elastase production in the lungs, induces exacerbation of pneumonia. Mice co‐infected with SARS‐CoV and <italic>Pp</italic>
 developed severe respiratory disease with extensive weight loss, resulting in a 33∼90% mortality rate. Mice with exacerbated pneumonia showed enhanced virus infection in the lungs and histopathological lesions similar to those found in human SARS cases. Intranasal administration of LPS, another elastase inducer, showed an effect similar to that of <italic>Pp</italic>
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Co‐infection of respiratory bacterium with severe acute respiratory syndrome coronavirus induces an exacerbated pneumonia in mice

Co‐infection of respiratory bacterium with severe acute respiratory syndrome coronavirus induces an exacerbated pneumonia in mice

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Abstract

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