Article

Cell-Derived Vaccine Against Bovine Leukaemia Virus Infection

Zentralblatt für Veterinärmedizin. Reihe B. Journal of veterinary medicine. Series B 01/1989; 35(10):736-46. DOI: 10.1111/j.1439-0450.1988.tb00553.x
Source: PubMed

ABSTRACT

The idea was tested whether live heterologous mammalian cells producing env gene glycoproteins and main structural protein p 24 of bovine leukaemia virus (BLV) could serve as a vaccination material in cattle to prevent induction of bovine leukaemia. A clone of ovine virus-non-producing cells NP-2 was found to express only a part of viral products. The NP-2 cells inoculated into rats induced antibody response directed against envelope glycoproteins of BLV. The antibodies neutralized the infectivity of BLV as determined by the VSV/BLV pseudotype neutralization test. Similar results were obtained by vaccination of cattle with these cells. In vaccinated animals antibodies against env gene products were detected. The antibody level increased after revaccination at any time during the observation period of 24 months. The antibodies neutralized BLV. A group of young heifers after repeated vaccination was challenged with virus or/and by virus-producing cells. The response to BLV infection was followed by syncytia formation on indicator CC 81 cells after co-cultivation with white blood cells from tested animals. While the unvaccinated control animal, two months after virus challenge, was found to be infected, all vaccinated animals were protected. Thus, live heterologous cells producing env gene products and p24 of BLV, can protect cattle against bovine leukaemia BLV-induced leukaemia.
Impfstoff zellulärer Abstammung gegen Infektion mit bovinen Leukoseviren
Die vorliegende Arbeit beschreibt die Verwendung von ovinen Zellkulturen als Impfstoff gegen bovine Leukoseviren (BLV). Dabei wird die bereits 1987 vorgestellte Zellinie NP-2 verwendet, die zwar das virale Hüll-(env-)Protein, aber keine Viruspartikel produziert. Die Stimulierung der Bildung neutralisierender Antikörper in Ratten wurde mit dem VSV/BLV-Pseudotyp-Neutralisationstest bestimmt. Anschließend wurden Rinder mit diesen heterologen Zellen immunisiert und der Titeranstieg nach Revakzination über 24 Monate verfolgt. Bei einigen Tieren wurde nach der ersten Revakzination ein Virusbelastungstest durchgeführt. In keinem der geimpften und anschließend belasteten Tiere konnte nach der gesamten Untersuchungsdauer vermehrungsfähiges Virus nachgewiesen werden.

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