title: Activities of ectonucleotidases and adenosine deaminase in platelets of cattle experimentally infected by Fasciola hepatica.
abstract: The enzymatic activities of NTPDase, 5'-nucleotidase and adenosine deaminase (ADA) are important in regulating the concentration of adenine nucleotides, molecules known to be involved on platelet aggregation. Fasciolosis causes coagulation disorders that have not been completely elucidated. Taking into consideration the association between the purinergic system and hemostasis, this study aimed to evaluate the enzymatic activities of NTPDase (hydrolyze ATP and ADP), 5'-nucleotidase (hydrolyze AMP) and ADA (deamination of adenosine) in platelets from cattle experimentally infected by Fasciola hepatica on days 20, 40, 60 and 80 post-infection (PI). For this study, 10 healthy Friesian steers were separated into two groups: the group A (n = 5) was used as uninfected control, and the group B was composed of steers experimentally infected by F. hepatica (n = 5). The number of platelets did not differ between groups in the periods evaluated. Reduction of NTPDase (p < 0.05) hydrolysing ATP (days 20, 40 and 60 PI), and ADP (days 40, 60 and 80 PI), and on 5'-nucleotidase hydrolyzing AMP (days 40 and 60 PI) was observed. A reduction (p < 0.05) in ADA activity on day 20 PI, as well as an increase (p < 0.05) in ADA activity on days 40 and 60 PI was observed when compared to the control. Based on these results, we can conclude that ATP, ADP and AMP hydrolysis and adenosine deamination were altered in platelets of cattle infected by F. hepatica. Considering the importance of the purinergic system in hemostasis, it is believed that those changes may contribute to the coagulation impairment observed in acute fasciolosis described in the literature.
authors.affiliation: Department of Biochemistry and Molecular Biology, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil; Department of Microbiology and Parasitology, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil.
authors.forename: Mateus
authors.initials: M
authors.lastname: Fracasso
authors.affiliation: Department of Biochemistry and Molecular Biology, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil; Department of Animal Science, Universidade do Estado de Santa Catarina, Chapecó, SC, Brazil. Electronic address: aleksandro_ss@yahoo.com.br.
authors.forename: Aleksandro S
authors.initials: AS
authors.lastname: Da Silva
authors.affiliation: Department of Microbiology and Parasitology, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil.
authors.forename: Matheus D
authors.initials: MD
authors.lastname: Baldissera
authors.affiliation: Department of Biochemistry and Molecular Biology, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil.
authors.forename: Nathieli B
authors.initials: NB
authors.lastname: Bottari
authors.affiliation: Laboratory of Veterinary Pathology, Instituto Federal Catarinense (IFC), Concórdia, SC, Brazil.
authors.forename: Mateus E
authors.initials: ME
authors.lastname: Gabriel
authors.affiliation: Laboratory of Veterinary Pathology, Instituto Federal Catarinense (IFC), Concórdia, SC, Brazil.
authors.forename: Manoela M
authors.initials: MM
authors.lastname: Piva
authors.affiliation: Laboratory of Veterinary Pathology, Instituto Federal Catarinense (IFC), Concórdia, SC, Brazil.
authors.forename: Fernanda A
authors.initials: FA
authors.lastname: Stedille
authors.affiliation: Laboratory of Veterinary Pathology, Instituto Federal Catarinense (IFC), Concórdia, SC, Brazil.
authors.forename: Ricardo
authors.initials: R
authors.lastname: Christ
authors.affiliation: Laboratory of Veterinary Pathology, Instituto Federal Catarinense (IFC), Concórdia, SC, Brazil.
authors.forename: Leandro A
authors.initials: LA
authors.lastname: Rhoden
authors.affiliation: Laboratory of Veterinary Pathology, Instituto Federal Catarinense (IFC), Concórdia, SC, Brazil.
authors.forename: Luan C
authors.initials: LC
authors.lastname: Henker
authors.affiliation: Department of Biochemistry and Molecular Biology, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil.
authors.forename: Vera M
authors.initials: VM
authors.lastname: Moresch
authors.affiliation: Department of Biochemistry and Molecular Biology, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil.
authors.forename: Maria Rosa C
authors.initials: MR
authors.lastname: Schetinger
authors.affiliation: Laboratory of Veterinary Pathology, Instituto Federal Catarinense (IFC), Concórdia, SC, Brazil. Electronic address: ricardo.mendes@ifc-concordia.edu.br.
authors.forename: Ricardo E
authors.initials: RE
authors.lastname: Mendes
mesh_terms: D000243:Adenosine Deaminase / Q000097:blood*; D000818:Animals; D001792:Blood Platelets / Q000201:enzymology*; D002417:Cattle; D002418:Cattle Diseases / Q000097:blood / Q000201:enzymology / Q000469:parasitology*; D005210:Fasciola hepatica / Q000502:physiology; D005211:Fascioliasis / Q000097:blood / Q000201:enzymology / Q000662:veterinary*; D005243:Feces / Q000469:parasitology; D008099:Liver / Q000469:parasitology / Q000473:pathology; D008297:Male; D009708:Nucleotidases / Q000097:blood*; D010270:Parasite Egg Count / Q000662:veterinary; D010976:Platelet Count / Q000662:veterinary
chemical_list: D009708:Nucleotidases; D000243:Adenosine Deaminase
keywords: ADP; AMP; ATP; Adenosine; Coagulation; Fasciolosis