Role of eosinophils and neutrophils in innate and adaptive protective immunity to larval Strongyloides stercoralis in mice

被引:90
作者
Galioto, Ann Marie
Hess, Jessica A.
Nolan, Thomas J.
Schad, Gerhard A.
Lee, James J.
Abraham, David
机构
[1] Thomas Jefferson Univ, Dept Microbiol & Immunol, Philadelphia, PA 19107 USA
[2] Univ Penn, Sch Vet Med, Dept Pathobiol, Philadelphia, PA 19104 USA
[3] Mayo Clin Scottsdale, Dept Biochem & Mol Biol, Scottsdale, AZ 85259 USA
关键词
D O I
10.1128/IAI.01958-05
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
The goal of this study was to determine the roles of eosinophils and neutrophils in innate and adaptive protective immunity to larval Strongyloides stercoralis in mice. The experimental approach used was to treat mice with an anti-CCR3 monoclonal antibody to eliminate eosinophils or to use CXCR2(-/-) mice, which have a severe neutrophil recruitment defect, and then determine the effect of the reduction or elimination of the particular cell type on larval killing. It was determined that eosinophils killed the S. stercoralis larvae in naive mice, whereas these cells were not required for the accelerated killing of larvae in immunized mice. Experiments using CXCR2(-/-) mice demonstrated that the reduction in recruitment of neutrophils resulted in significantly reduced innate and adaptive protective immunity. Protective antibody developed in the immunized CXCR2(-/-) mice, thereby demonstrating that neutrophils were not required for the induction of the adaptive protective immune response. Moreover, transfer of neutrophil-enriched cell populations recovered from either wild-type or CXCR2(-/-) mice into diffusion chambers containing larvae demonstrated that larval killing occurred with both cell populations when the diffusion chambers were implanted in immunized wild-type mice. Thus, the defect in the CXCR2(-/-) mice was a defect in the recruitment of the neutrophils and not a defect in the ability of these cells to kill larvae. This study therefore demonstrated that both eosinophils and neutrophils are required in the protective innate immune response, whereas only neutrophils are necessary for the protective adaptive immune response to larval S. stercoralis in mice.
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页码:5730 / 5738
页数:9
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