Periódicos Brasileiros em Medicina Veterinária e Zootecnia

p. 01-07

Cholinesterase activity in serum, whole blood and lymphocytes of dogs experimentally infected with Rangelia vitalii

Schafer da Silva, AleksandroTeresinha França, RaqueliMachado Costa, MarcioBreno Paim, CarlosChimelo Paim, FrancineSchmatz, RobertaAugusto Jaques, JeandreRosa Schetinger, MariaMaria Morsch, VeraMelazzo Mazzanti, CinthiaTerezinha dos Anjos Lopes, Sonia

Background: The cholinergic system is involved in many biological functions in mammals and is associated with pathogenesis of infectious diseases, as has participation in transmission of nerve impulses in cholinergic synapses, haematopoiesis, regulation of inflammatory markers, production and coordination of movement, and memory. Rangelia vitalii is a parasite endemic to south of Brazil. This parasite multiplies in the blood and can be visualized in plasma in its free form and/or within leukocytes and erythrocytes, causing various pathologies. Therefore, the purpose of this study was to investigate the activity of cholinergic system enzymes in dogs experimentally infected with R. vitalii. Materials, Methods & Results: Twelve dogs were used, divided into two groups: control group (n = 5), consisting of healthy animals, and infected group with R. vitalii (n = 7). Fresh blood samples of these infected animals were inoculated in seven dogs (2 mL/dog through the jugular vein). Blood samples were collected on days 0, 10 and 20 post-infection (PI). Butyrylcholinesterase (BChE) activity was measured in serum and acetylcholinesterase (AChE) in lymphocytes and whole blood. Boold samples were diluted 1:50 (v/v) in lysis solution (0.1 mmol/L potassium/sodium phosphate buffer containing 0.03% Triton X-100) and frozen (-20 ºC by 7 days) to determine AChE activity in whole blood. Lymphocy

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