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Influence of caprine arthritis encephalitis virus on blood and milk immunogram of naturally infected goats

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Author(s):
Bruna Parapinski dos Santos
Total Authors: 1
Document type: Master's Dissertation
Press: São Paulo.
Institution: Universidade de São Paulo (USP). Faculdade de Medicina Veterinária e Zootecnia (FMVZ/SBD)
Defense date:
Examining board members:
Alice Maria Melville Paiva Della Libera; Maiara Garcia Blagitz; Cristina de Oliveira Massoco Salles Gomes
Advisor: Alice Maria Melville Paiva Della Libera
Abstract

The caprine arthritis encephalitis (CAE) is a multisystem lentivirose that have the goat mammary gland as one target of the lesional disease. May cause a mammary specific expression, called indurative mastitis, beyond these organ represent a major route of virus elimination, even in animals that do not exhibit this clinical manifestation. Considering the possibility of this virus, whose target cell are predominantly monocyte, lead to immunological changes that influence the animal\'s susceptibility to other diseases, this study aimed to evaluate the interaction of virus and host immunity by phenotyping, phagocytosis and production of reactive oxygen species (ROS) and the mechanisms of cell death, in blood and milk of goats naturally infected. For that, 200 goats were screened and was selected eight females non sero-reagents and ten seroreagents for serum antibodies against CAE, with the haematological analises within the species standards and two negative bacteriological tests of milk. Milk and blood from these animals underwent the following tests: phenotyping of leukocytes CD4+, CD8+, CD14+, PG68A+ and CD45+, phagocytosis of Staphylococcus aureus and Escherichia coli ROS production by CD14+ and PG68A+ cells, and labeling with Annexin-V and propidium iodide (PI) for granulocytes and mononuclear cells. CAEV infection may be associated with an increase in CD14+ cells in milk, but not in blood. The other cellular profile did not change. In the phagocytic function, the virus reduced the percentage of phagocytosis of Staphylococcus aureus by granulocytes PG68A+ milk. This change did not occur in the phagocytosis of Escherichia coli and production of ROS in these cells, nor in phagocytosis and ROS production by CD14+ cells, noting that in those cases the bacterial species may undergo interactions with the virus or even with the immune response of the infected organism. The VAEC not significantly affect the mechanism of death now investigated, but the tendency of the results suggests that can induce apoptosis and/or necrosis in the blood granulocytes and influence the process of necrosis of these cells in milk, without changing these processes mononuclear cells. We emphasize the importance of monocyte-neutrophil interaction in the mammary gland, especially in animals seropositive for CAE, even in the absence of bacterial mastitis. (AU)

FAPESP's process: 09/13410-7 - Mammary gland immunogram of goats naturally infected with Caprine Encephalitis Arthritis
Grantee:Bruna Parapinski dos Santos
Support Opportunities: Scholarships in Brazil - Master