title: Effects of metronidazole and tinidazole on NTPDase1 and ecto-5'-nucleotidase from intact cells of Trichomonas vaginalis.
abstract: Here we report the effects of metronidazole and tinidazole on NTPDase1 and ecto-5'-nucleotidase from intact cells of Trichomonas vaginalis. Adenosine triphosphate (ATP) and adenosine diphosphate (ADP) hydrolysis was 5- to 7-fold higher for the fresh clinical strain, when compared with the ATCC (American Type Culture Collection) strain. ATP hydrolysis was activated in the presence of metronidazole in the ATCC strain, whilst it was inhibited 33% by 50 microM tinidazole in a fresh clinical isolate. The treatment of cells in the presence of metronidazole for 2 h inhibited ATP and ADP hydrolysis, whilst treatment with tinidazole inhibited ATP and ADP hydrolysis only in the fresh clinical isolate. The drugs did not change the ecto-5'-nucleotidase activity for both strains. Our results suggest that the modulation of extracellular ATP and ADP levels during treatment with these drugs could be a parasitic defence strategy as a survival mechanism in an adverse environment.
authors.affiliation: Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos 2600-Anexo, 90035-003 Porto Alegre, RS, Brazil.
authors.forename: Tiana
authors.initials: T
authors.lastname: Tasca
authors.forename: Fernanda Pires
authors.initials: FP
authors.lastname: Borges
authors.forename: Carla Denise
authors.initials: CD
authors.lastname: Bonan
authors.forename: Geraldo Attilio
authors.initials: GA
authors.lastname: De Carli
authors.forename: Ana Maria Oliveira
authors.initials: AM
authors.lastname: Battastini
authors.forename: João José Freitas
authors.initials: JJ
authors.lastname: Sarkis
mesh_terms: D015720:5'-Nucleotidase / Q000378:metabolism*; D000244:Adenosine Diphosphate / Q000378:metabolism; D000249:Adenosine Monophosphate / Q000378:metabolism; D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D000994:Antitrichomonal Agents / Q000494:pharmacology; D001081:Apyrase / Q000378:metabolism*; D008795:Metronidazole / Q000494:pharmacology*; D014011:Tinidazole / Q000494:pharmacology*; D014246:Trichomonas vaginalis / Q000187:drug effects / Q000201:enzymology*
chemical_list: D000994:Antitrichomonal Agents; D014011:Tinidazole; D008795:Metronidazole; D000249:Adenosine Monophosphate; D000244:Adenosine Diphosphate; D000255:Adenosine Triphosphate; D015720:5'-Nucleotidase; D001081:Apyrase