Eosinophils contribute to innate antiviral immunity and promote clearance of respiratory syncytial virus

被引:243
作者
Phipps, Simon
Lam, Chuan En
Mahalingam, Suresh
Newhouse, Matthew
Ramirez, Ruben
Rosenberg, Helene F.
Foster, Paul S.
Matthaei, Klaus I.
机构
[1] Univ Newcastle, Sch Biomed Sci, Ctr Asthma & Rep Dis, Newcastle, NSW 2300, Australia
[2] Hunter Med Res Inst, Vaccines Immun Viruses & Asthma Grp, Newcastle, NSW, Australia
[3] Australian Natl Univ, John Curtin Sch Med Res, Canberra, ACT 2600, Australia
[4] Univ Canberra, Sch Hlth Sci, Ctr Virus Res, Belconnen, ACT 2616, Australia
[5] NIAID, Natl Inst Hlth, Bethesda, MD 20892 USA
关键词
D O I
10.1182/blood-2007-01-071340
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Eosinophils are recruited to the lungs in response to respiratory syncytial virus (RSV) infection; however, their role in promoting antiviral host defense remains unclear. Here, we demonstrate that eosinophils express TLRs that recognize viral nucleic acids, are activated and degranulate after single-stranded RNA (ssRNA) stimulation of the TLR-7-MyD88 pathway, and provide host defense against RSV that is MyD88 dependent. In contrast to wild-type mice, virus clearance from lung tissue was more rapid in hypereosinophilic (interleukin-5 trans-genic) mice. Transfer of wild-type but not MyD88-deficient eosinophils to the lungs of RSV-infected wild-type mice accelerated virus clearance and inhibited the development of airways hyperreactivity. Similar responses were observed when infected recipient mice were MyD88 deficient. Eosinophils isolated from infected hypereosinophilic MyD88-sufficient but not MyD88-deficient mice expressed greater amounts of IFN regulatory factor (IRF)-7 and eosinophil-associated ribonucleases EAR-1 and EAR-2. Hypereosinophilia in the airways of infected mice also correlated with increased expression of IRF-7, IFN-beta, and NOS-2, and inhibition of NO production with the NOS-2 inhibitor L-NMA partially reversed the accelerated virus clearance promoted by eosinophils. Collectively, our results demonstrate that eosinophils can protect against RSV in vivo, as they promote virus clearance and may thus limit virus-induced lung dysfunction.
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页码:1578 / 1586
页数:9
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