title: NTPDase and 5'-nucleotidase activities in platelets of human pregnants with a normal or high risk for thrombosis.
abstract: The nucleotide degrading enzymes, ectonucleotidases, present on the platelet surface of human pregnant with a normal (without complications) or high risk for thrombosis (hypertension and gestational diabetes) were studied. NTPDase (E.C. 3.6.1.5, CD39) and 5'-nucleotidase (E.C. 3.1.3.5, CD73) activities of four patient groups, non-pregnant (NP, n = 18), pregnant without complications (P, n = 25), pregnant with hypertension (HP, n = 15) and pregnant with gestational diabetes mellitus (GDP, n = 10), were analyzed. Increased NTPDase activities were observed in the groups P (37.0%, S.D. = 2.03 and 34.0%, S.D. = 3.19), HP (40.0%, S.D. = 3.32 and 56.0%, S.D. = 3.25) and GDP (23.0%, S.D. = 2.30 and 42.0%, S.D. = 2.26) in comparison to the control group NP (p < 0.01, S.D. = 1.92 and S.D. = 2.48) when ATP and ADP were used as substrate, respectively. AMP was used as substrate to determine the 5'-nucleotidase activities, which showed to be elevated in the groups P (45.0%, S.D. = 1.73), HP (54.0%, S.D. = 2.64) and GDP (68.0%, S.D. = 1.69) when compared to the control group NP (p < 0.01, S.D. = 1.26). However, no statistically significant differences were observed between the groups P, HP and GDP. As a consequence, the enhanced ATP, ADP and AMP hydrolysis was ascribed to the pregnancy itself, independent of a normal or high risk for thrombosis. The enhanced NTPDase and 5'-nucleotidase activities in platelets suggest that these enzymes are involved in the thromboregulation process in the pregnancy.
authors.affiliation: Departamento de Análises Clínicas e Toxicológicas, Centro de Ciências da Saúde, Universidade Federal de Santa Maria, Av. Roraima, Santa Maria, RS 97105-900, Brazil.
authors.forename: Claudio A M
authors.initials: CA
authors.lastname: Leal
authors.forename: Maria R C
authors.initials: MR
authors.lastname: Schetinger
authors.forename: Daniela B R
authors.initials: DB
authors.lastname: Leal
authors.forename: Karine
authors.initials: K
authors.lastname: Bauchspiess
authors.forename: Clarissa M L
authors.initials: CM
authors.lastname: Schrekker
authors.forename: Paula A
authors.initials: PA
authors.lastname: Maldonado
authors.forename: Vera M
authors.initials: VM
authors.lastname: Morsch
authors.forename: José E P
authors.initials: JE
authors.lastname: da Silva
mesh_terms: D015720:5'-Nucleotidase / Q000378:metabolism*; D000244:Adenosine Diphosphate / Q000097:blood; D000249:Adenosine Monophosphate / Q000097:blood; D000255:Adenosine Triphosphate / Q000097:blood; D000328:Adult; D015703:Antigens, CD / Q000378:metabolism*; D001081:Apyrase / Q000378:metabolism*; D001792:Blood Platelets / Q000201:enzymology* / Q000378:metabolism; D002199:Capillary Permeability; D002463:Cell Membrane Permeability; D005260:Female; D006801:Humans; D007770:L-Lactate Dehydrogenase / Q000378:metabolism; D011247:Pregnancy / Q000097:blood*; D011249:Pregnancy Complications, Cardiovascular / Q000097:blood / Q000201:enzymology* / Q000378:metabolism; D012307:Risk Factors; D013927:Thrombosis / Q000097:blood / Q000201:enzymology / Q000209:etiology* / Q000378:metabolism
chemical_list: D015703:Antigens, CD; D000249:Adenosine Monophosphate; D000244:Adenosine Diphosphate; D000255:Adenosine Triphosphate; D007770:L-Lactate Dehydrogenase; D015720:5'-Nucleotidase; D001081:Apyrase; C067869:CD39 antigen