NDLI: In the Absence of CD154, Administration of Interleukin-12 Restores Th1 Responses but Not Protective Immunity to Schistosoma mansoni ▿

Content Provider	PubMed Central
Author	Hewitson, James P. Hamblin, Paul A. Mountford, Adrian P.
Copyright Year	2007
Abstract	The cytokine interplay during the development of protective immunity to the radiation-attenuated (RA) schistosome vaccine has been extensively characterized over recent years, yet the role of costimulatory molecules in the development of cell-mediated immunity is much less well understood. Here we demonstrate the importance of CD40/CD154 in vaccine-induced immunity, as CD154−/− mice exposed to RA schistosomes develop no protection to challenge infection. We showed that vaccinated CD154−/− mice have defective Th1-associated immune responses in the skin-draining lymph nodes and the lungs, with reduced or absent levels of interleukin-12p40 (IL-12p40), gamma interferon, and nitric oxide, but elevated levels of lung IL-4 and IL-5. The expression of major histocompatibility complex II (MHC-II) on antigen-presenting cells recovered from the lungs of vaccinated CD154−/− mice was also severely compromised. The administration of anti-CD40 monoclonal antibody (MAb) to CD154−/− mice did not reconstitute sustained Th1 responses in the lymph nodes or the lungs, nor did the MAb restore anti-parasite immunoglobulin G production or protective immunity. On the other hand, the administration of recombinant IL-12 (rIL-12) to CD154−/− mice shortly after vaccination caused elevated and sustained levels of Th1-associated cytokines, rescued MHC-II expression by lung CD11c+ cells, and restored the appearance of inflammatory effector foci in the lungs. However, the treatment of CD154−/− mice with rIL-12 did not restore protection. We conclude that protective immunity to the RA schistosome vaccine is CD154 dependent but is independent of IL-12-orchestrated cellular immune mechanisms in the lungs.
Related Links	http://dx.doi.org/10.1128/IAI.00252-07
Starting Page	3539
File Format	PDF
ISSN	10985522
e-ISSN	10985522
Journal	Infection and Immunity
Issue Number	7
Volume Number	75
Language	English
Publisher	American Society for Microbiology
Publisher Date	2007-07-01
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Infectious Diseases Parasitology Immunology Microbiology

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