title: Previous treatment with ebselen and vitamin E alters adenine nucleotide hydrolysis in platelets from adult rats experimentally demyelinated with ethidium bromide.
abstract: Many aspects of the relationship between the demyelinating pathology and platelet function need to be elucidated. Thus, the activity of NTPDase and 5'-nucleotidase enzymes was analyzed in platelets from rats demyelinated with ethidium bromide (EB) and previously treated with ebselen (Ebs) and vitamin E (Vit. E). The animals were divided into four groups: for ebselen, the groups were: I-control (saline), II-(saline and Ebs), III-(EB) and IV-(EB and Ebs); and for vitamin E, the groups were: I - control (saline), II-(saline and Vit. E), III-(EB) and IV-(EB and Vit. E). After 3 and 21 days, the blood was collected and the platelets were separated for enzymatic assays. For the treatment with Ebs, the NTPDase activity for ATP substrate was significantly lower in groups II, III and IV (p < 0.05) after 3 days, while after 21 days, a reduction was observed in group III (p < 0.05). ADP hydrolysis was reduced in group II (p < 0.05) and increased in group IV (p < 0.05) after 3 days, while after 21 days there was an increase in group IV (p < 0.05). In the treatment with Vit. E, ATP hydrolysis was lower in groups II, III and IV (p < 0.05) after 3 and 21 days. ADP hydrolysis was increased in group II (p < 0.05) after 3 days, and in group IV (p < 0.05) after 21 days. However, 5'-nucleotidase activity was not altered by the treatments. These findings demonstrate that NTPDase activity in platelets is diminished in demyelinating events and the treatments with Ebs and Vit. E modulated adenine nucleotide hydrolysis.
authors.affiliation: Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcellos, 2600-Anexo, 90035-003, Porto Alegre, RS, Brazil.
authors.forename: Cinthia M
authors.initials: CM
authors.lastname: Mazzanti
authors.forename: Roselia M
authors.initials: RM
authors.lastname: Spanevello
authors.forename: André
authors.initials: A
authors.lastname: Morsch
authors.forename: Rafael
authors.initials: R
authors.lastname: Zanin
authors.forename: Vanessa
authors.initials: V
authors.lastname: Battisti
authors.forename: Mushtaq
authors.initials: M
authors.lastname: Ahmed
authors.forename: Jamile F
authors.initials: JF
authors.lastname: Gonçalves
authors.forename: Alexandre
authors.initials: A
authors.lastname: Mazzanti
authors.forename: Dominguita L
authors.initials: DL
authors.lastname: Graça
authors.forename: Vera M
authors.initials: VM
authors.lastname: Morsch
authors.forename: Maria Rosa C
authors.initials: MR
authors.lastname: Schetinger
mesh_terms: D015720:5'-Nucleotidase / Q000378:metabolism; D000227:Adenine Nucleotides / Q000378:metabolism*; D000244:Adenosine Diphosphate / Q000097:blood; D000249:Adenosine Monophosphate / Q000097:blood; D000255:Adenosine Triphosphate / Q000097:blood; D000818:Animals; D000975:Antioxidants / Q000494:pharmacology*; D001393:Azoles / Q000494:pharmacology*; D001792:Blood Platelets / Q000187:drug effects / Q000378:metabolism*; D003711:Demyelinating Diseases / Q000139:chemically induced / Q000378:metabolism* / Q000473:pathology; D004996:Ethidium; D006868:Hydrolysis; D054833:Isoindoles; D008297:Male; D016566:Organoselenium Compounds / Q000494:pharmacology*; D011149:Pons / Q000473:pathology; D051381:Rats; D017208:Rats, Wistar; D014810:Vitamin E / Q000494:pharmacology*
chemical_list: D000227:Adenine Nucleotides; D000975:Antioxidants; D001393:Azoles; D054833:Isoindoles; D016566:Organoselenium Compounds; D014810:Vitamin E; C042986:ebselen; D000249:Adenosine Monophosphate; D000244:Adenosine Diphosphate; D000255:Adenosine Triphosphate; D015720:5'-Nucleotidase; D004996:Ethidium