Pneumococcal neuraminidases A and B both have essential roles during infection of the respiratory tract and sepsis

被引:139
作者
Manco, Sonia
Hernon, Fidelma
Yesilkaya, Hasan
Paton, James C.
Andrew, Peter W.
Kadioglu, Aras
机构
[1] Univ Leicester, Dept Infect Immun & Inflammat, Leicester LE1 9HN, Leics, England
[2] Univ Adelaide, Sch Mol & Biomed Sci, Adelaide, SA 5005, Australia
基金
英国惠康基金;
关键词
D O I
10.1128/IAI.01237-05
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
We examined the role of the neuraminidases NanA and NanB in colonization and infection in the upper and lower respiratory tract by Streptococcus pneumoniae, as well as the role of these neuraminidases in the onset and development of septicemia following both intranasal and intravenous infection. We demonstrated for the first time using outbred MF1 mouse models of infection that both NanA and NanB were essential for the successful colonization and infection of the upper and lower respiratory tract, respectively, as well as pneumococcal survival in nonmucosal sites, such as the blood. Our studies have shown that in vivo a neuraminidase A mutant is cleared from the nasopharynx, trachea, and lungs within 12 111 postinfection, while a neuraminidase B mutant persists but does not increase in either the nasopharynx, trachea, or lungs. We also demonstrated both neuraminidase mutants were unable to cause sepsis following intranasal infections. When administered intravenously, however, both mutants survived initially but were unable to persist in the blood beyond 48 111 postinfection and were progressively cleared. The work presented here demonstrates the importance of pneumococcal neuraminidase A and for the first time neuraminidase B in the development of upper and lower respiratory tract infection and sepsis.
引用
收藏
页码:4014 / 4020
页数:7
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