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Lymphocyte subpopulations and apoptosis of immune cells in rabbits experimentally infected with a strain of the RHD virus having a variable haemagglutination capacity

100%
Niedzwiedzka-Rystwej P., Deptula W.
Polish Journal of Veterinary Sciences
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2012
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tom 15
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nr 1
The paper describes the immunological response in the matter of percentage of T cells (receptor CD5+) and subpopulations (Th with receptor CD4+, Tc/Ts with receptor CD8+, T with receptor CD25+) and B cells with receptor CD19+, as well as the percentage of apoptotic granulocytes and lymphocytes, in rabbits experimentally infected with the Hagenow strain of the RHD virus. The material chosen for the experiment is special, as among all strains of RHD virus, there are only two strains which carry the variable haemagglutination capacity of red cells. The results of the study show that the Hagenow strain gives an untypical picture of T and B lymphocytes, whereas the results in inducing apoptosis seems to corespond with previous data, confirming the inclusion of apoptosis from 4 h p.i. and the intensity of the phenomenon being higher in granulocytes.
2
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Identification of Polish RHDVa subtype strains based on the analysis of a highly variable part VP60 gene

80%
Fitzner A., Niedbalski W., Paprocka G., Kesy A.
Polish Journal of Veterinary Sciences
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2012
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tom 15
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nr 1
In order to determine the genetic variability of Polish RHD virus strains and to confirm the presence of genetic variant (RHDVa) subtype the partial nucleotide sequences of capsid protein gene, including two highly variable regions C and E, were examined. Phylogenetic analyses of 15 viral strains obtained over 18 years revealed the presence of three genetic groups. The oldest RHDV strains exhibit very close amino acid sequence similarity (98-99%) to the German FRG89 reference strain and most of European strains of the same period, as well as Chinese isolate from 1984. The HA-negative strains and isolates with variable reactivity in the HA test belong to the second subgroup and exhibit an intermediate level of variability (about 3%) in the analysed VP60 gene fragment. The most genetically variable strains (6-7%) clustered to RHDVa subtype. The analysis of nucleotides and amino acid sequences demonstrated three pairs of well conserved RHDV strains, isolated over 3, 6 and 10-year period.
3

Dynamics of peripheral blood lymphocytes in rabbits experimentally infected with two Czech strains of RHD virus

80%
Hukowska-Szematowicz B., Deptula W.
Bulletin of the Veterinary Institute in Puławy
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2008
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tom 52
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nr 1
Changes in the number of T and B lymphocytes and their subpopulations (Th, Tc/Ts, cells with CD25+ receptor) in peripheral blood of rabbits experimentally infected with one of two Czech strains (CAMPV-351 and CAMPV-561) of RHD virus were studied. The lymphocytes were identified using a cytometer and monoclonal antibodies directed against CD5+ (at T lymphocytes), CD4+ (at Th lymphocytes), CD8+ (at Tc/Ts lymphocytes), CD25, or IgM receptor at B lymphocytes. In addition, disease symptoms were recorded in the infected rabbits and their mortality was monitored. Analysis of the results showed that the examined strains induced a distinct immune response of the lymphocytes and that the response was more pronounced following the infection with the CAMPV-561 strain. The recorded changes were expressed more frequently by an increased than decreased percentages of the examined lymphocytes. The mortality was variable and reached 30% in animals infected with the CAMPV-351 strain and 75% in animals infected with the CAMPV-561 strain.
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