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Peripheral blood lymphocyte proliferative responses in cattle infected with or vaccinated against Anaplasma marginale

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Gale, K.R., Gartside, M. G., Dimmock, C. M., Zakrzewski, H. and Leatch, G. (1996) Peripheral blood lymphocyte proliferative responses in cattle infected with or vaccinated against Anaplasma marginale. Parasitology Research, 82 . pp. 551-562. ISSN 1432-1955


Article Link: https://doi.org/10.1007/s004360050161


An assay was developed for measurement of the peripheral blood lymphocyte proliferative response (PBLPR) in cattle infected with or immunised against Anaplasma marginale. PBLPR was not evident in all cattle that had recovered from A. marginale infection. However, A. marginale-sensitised lymphocytes were detected in the spleens of all immune cattle tested in the absence of detectable PBLPR. During the course of initial infection, cattle exhibited detectable PBLPR for a period corresponding with and up to 2 weeks after patent parasitaemia, followed by a second, usually larger peak in PBLPR corresponding to the time of sub-clinical relapse of cattle. Analysis of the PBLPR of A. marginale chronically infected cattle demonstrated highly variable PBLPR between individuals and over time. A positive PBLPR was induced in cattle by vaccination using a crude A. marginale antigen preparation. The PBLPR of vaccinated cattle subsequently infected with A. marginale was markedly different from that of naive cattle, with reduced PBLPR being associated with the onset of parasitaemia. The antigen used in the PBLPR assay was inactivated by proteolysis. Proteolysis also abolished immunity that had been induced in cattle vaccinated using the antigen preparation. A. marginale-sensitised PBL did not proliferate in response to antigen from the heterologous species A. centrale. A. centrale-sensitised PBL, however, responded to A. marginale antigen. Interferon-γ (IFN-γ) was detected in PBLPR-assay supernatants and was associated with a strong PBLPR.

Item Type:Article
Subjects:Veterinary medicine > Veterinary pathology
Veterinary medicine > Veterinary parasitology
Veterinary medicine > Diseases of special classes of animals > Cattle
Live Archive:10 Apr 2024 03:49
Last Modified:10 Apr 2024 03:49

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