ENHANCED PULMONARY HISTOPATHOLOGY INDUCED BY RESPIRATORY SYNCYTIAL VIRUS (RSV) CHALLENGE OF FORMALIN-INACTIVATED RSV-IMMUNIZED BALB/C MICE IS ABROGATED BY DEPLETION OF INTERLEUKIN-4 (IL-4) AND IL-10

被引:250
作者
CONNORS, M
GIESE, NA
KULKARNI, AB
FIRESTONE, CY
MORSE, HC
MURPHY, BR
机构
[1] NIAID,INFECT DIS LAB,RESP VIRUSES SECT,BETHESDA,MD 20892
[2] NIAID,IMMUNOPATHOL LAB,BETHESDA,MD 20892
关键词
D O I
10.1128/JVI.68.8.5321-5325.1994
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
In previous studies, children immunized with a formalin-inactivated respiratory syncytial virus vaccine (FI-RSV) developed severe pulmonary disease with greater frequency than did controls during subsequent natural RSV infection. In earlier efforts to develop an animal model for this phenomenon, extensive pulmonary histopathology developed in FI-RSV-immunized cotton rats and mice subsequently challenged with RSV. In mice, depletion of CD4(+) T cells at the time of RSV challenge completely abrogated this histopathology. Furthermore, the predominant cytokine mRNA present in lungs of FI-RSV-immunized mice during subsequent infection with RSV was that characteristically secreted by Th2 T cells, namely interleukin-4 (IL-4). In the present studies, we sought to determine the relative contributions of gamma interferon (IFN-gamma), IL-2, IL-4, and IL-10 to the lymphocytic infiltration into the lungs observed following RSV challenge of mice previously immunized with FI-RSV. Mice previously immunized with FI-RSV or infected with RSV were depleted of IFN-gamma, IL-2, IL-4, or IL-10 immediately before RSV challenge, and the magnitude of inflammatory cell infiltration around bronchioles and pulmonary blood vessels was quantified. The phenomenon of pulmonary-histopathology potentiation by FI-RSV was reproduced in the present study, thereby allo,wing us to investigate the effect of cytokine depletion on the process. Simultaneous depletion of both IL-4 and IL-10 completely abrogated pulmonary histopathology in FI-RSV-immunized mice. Depletion of IL-4 alone significantly reduced bronchiolar, though not perivascular, histopathology. Depletion of IL-10 alone had no effect. Depletion of IFN-gamma, IL-2, or both together had no effect on the observed histopathology. These data indicate that FI-RSV immunization primes for a Th2-, IL-4-, and IL-10-dependent inflammatory response to subsequent RSV infection. It is possible that this process played a role in enhanced disease observed in infants and children immunized with FI-RSV.
引用
收藏
页码:5321 / 5325
页数:5
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