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Infection and Immunity, March 2000, p. 1383-1390, Vol. 68, No. 3
Infection and Immunity Group, Department of
Biology, National University of Ireland, Maynooth, County Kildare,
Ireland
Received 7 September 1999/Returned for modification 10 November
1999/Accepted 22 November 1999
Protection against infectious pathogens at mucosal surfaces is
dependent on local antibody responses, production of inflammatory mediators, and recruitment of immune effector cells to the site of
infection. Since Th1 and Th2 cells produce cytokines with pro- and
anti-inflammatory activities, immunization with vaccines that induce
these T-cell subtypes may regulate the subsequent inflammatory response
to infection. We have demonstrated that immunization of mice with
pertussis whole-cell or acellular vaccines (Pw or Pa) selectively
induces Th1 and Th2 cells, respectively. In this study we have used a
murine respiratory-infection model to demonstrate that priming with a
Th1- or Th2-inducing pertussis vaccine can influence the local
inflammatory response and immune effector cells in the lung following
aerosol challenge with Bordetella pertussis. Analysis of
bronchoalveolar lavage (BAL) fluid taken during the course of B. pertussis infection of naïve mice or mice immunized with
Pw revealed an early influx of neutrophils and local production of
interleukin 1
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Copyright © 2000, American Society for Microbiology. All rights reserved.
A Regulatory Role for Interleukin 4 in Differential
Inflammatory Responses in the Lung following Infection of Mice Primed
with Th1- or Th2-Inducing Pertussis Vaccines
(IL-1
) in the lungs. In contrast, neutrophil
infiltration and IL-1
production were not observed following
challenge of mice immunized with the Th2-inducing Pa. Conversely,
during infection local production of IL-6 and IL-1ra was significantly
greater in mice immunized with Pa than in those immunized with Pw.
Studies of knockout mice revealed neutrophil and lymphocyte
infiltration in the lungs following B. pertussis infection
of IL-4-defective (IL-4
/
) mice but not in wild-type
mice immunized with Pa. Furthermore, the levels of IL-1
, IL-6, and
IL-1ra in Pa-immunized IL-4
/
mice were comparable to
those in mice immunized with Pw. These results demonstrate distinct
influences of Th1- and Th2-inducing vaccines on the protective
inflammatory responses in the lungs following challenge with B. pertussis and implicate IL-4 as an important regulator of
inflammatory-cell recruitment.
*
Corresponding author. Mailing address: Infection and
Immunity Group, Department of Biology, National University of Ireland, Maynooth, Co. Kildare, Ireland. Phone: 353-1-7083838. Fax:
353-1-7083845. E-mail: kingston.mills{at}may.ie.
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