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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Medical microbiology and immunology 185 (1997), S. 207-215 
    ISSN: 1432-1831
    Keywords: Key words Immune responses ; Filariasis ; Helminth infection ; Laboratory mouse model ; T cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Models of filarial infection in laboratory inbred mice are valuable tools for assessing the relevance of anti-filarial immune responses in protection against these parasites. However, laboratory mice are not permissive for those filarial species which are known to infect humans. Therefore, immunity to the different stages of these filariae, i.e. infective third stage larvae (L3), adults and microfilariae, has been analyzed separately, as a surrogate approach. Although much information has been gathered by analysis of immunity and intervention in particular immune responses in these experimental systems, interference of different stage-specific responses as well as modulation of filarial maturation by the immune system cannot be assessed. A newly established infection model of filariasis, namely infection of laboratory mice with Lito-mosoides sigmodontis, accommodates the full developmental cycle of the parasite and may overcome this deficiency. Although the disadvantage of this latter model is that it deals with a filaria which is not pathogenic to man, it is the only model in which immunity can be analyzed during maturation of infective larvae into adult worms, the period considered most important for vaccination studies.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1831
    Keywords: Key words Interleukin-5 ; Murine filariasis ; Eosinophils ; Vaccine-induced protection ; Helminth infection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The pathways conferring immunity to human filariases are not well known, in part because human-pathogenic filariae do not complete a full life cycle in laboratory mice. We have used the only fully permissive infection of mice with filariae, i.e., infection of BALB/c mice with the rodent filarial nematode Litomosoides sigmodontis. Our previous results showed that worm development is inversely correlated with Th2 cytokine production and eosinophilia. The scope of the present study was to directly elucidate the role of interleukin-5 (IL-5) and eosinophils in controlling the development of L. sigmodontis after vaccination and in primary infection. BALB/c mice immunized with irradiated third-stage larvae (L3) were confirmed to have elevated IL-5 levels as well as high subcutaneous eosinophilia and to attack and reduce incoming larvae within the first 2 days, resulting in 70% reduction of worm load. Treatment of vaccinated mice with anti-IL-5 antibody (TRFK-5) suppressed both blood and tissue eosinophilia and completely abolished protection. This demonstrates, for the first time in a fully permissive filarial infection, that IL-5 is essential for protection induced by irradiated L3 larvae. In contrast, in primary-infected mice, anti-IL-5 treatment did not modify filarial infection within the 1st month, most likely because during primary infection IL-5-dependent mechanisms such as subcutaneous eosinophilia are induced too late to disturb worm establishment. However, there is a role for IL-5 late in primary infection where neutrophil-dependent worm encapsulation is also under the control of IL-5.
    Type of Medium: Electronic Resource
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