title: Antioxidant effect of a novel class of telluroacetilene compounds: studies in vitro and in vivo.
abstract: OBJECTIVE
  The effect of telluroacetylenes a-d on pharmacological assays was investigated in vitro. A second objective of this study was to investigate the antioxidant action of compound b against the oxidative damage induced by sodium nitroprusside (SNP) in mouse brain.
  
  
  METHODS
  In in vitro experiments, lipid peroxidation (LP) and protein carbonyl (PC) levels and delta-aminolevulinate dehydratase (delta-ALA-D) activity were carried out in rat brain homogenate. The thiol peroxidase-like activity and DPPH radical scavenging of telluroacetylenes a-d were investigated. In in vivo experiments, mice received SNP (0.335 micromol per site) intra cerebroventricular (i.c.v.) thirty minutes after oral administration of telluroacetylene b (10 mg/kg). After 1 h, animals were euthanized. The levels of LP and delta-ALA-D, catalase (CAT), glutathione peroxidase (GPx), glutathione reductase (GR), glutathione S-transferase (GST) activities were carried out in mouse brain homogenate.
  
  
  RESULTS
  Telluroacetylenes a-d, at low muM range, reduced LP and PC levels in rat brain homogenate. Telluroacetylenes a-d showed effect of scavenging DPPH radicals. delta-ALA-D activity was inhibited by telloruacetylenes a-d, at high muM range, in rat brain homogenate. Brains of mice treated with SNP showed an increase in LP and the reduction in delta-ALA-D, GR and GST activities. Telluroacetylene b protected against the oxidative stress caused by SNP in brain of rats.
  
  
  CONCLUSIONS
  The results support an antioxidant effect of telluroacetylenes a-d in vitro. Telluroacetylene b protected against oxidative damage caused by SNP in mouse brain, suggesting an antioxidant effect of this compound.
authors.affiliation: Departamento de Química, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Santa Maria, CEP 97105-900, RS, Brazil.
authors.forename: Ana Cristina G
authors.initials: AC
authors.lastname: Souza
authors.forename: Cristiane
authors.initials: C
authors.lastname: Luchese
authors.forename: Jose S
authors.initials: JS
authors.lastname: Santos Neto
authors.forename: Cristina W
authors.initials: CW
authors.lastname: Nogueira
mesh_terms: D000480:Alkynes / Q000737:chemistry / Q000494:pharmacology*; D000818:Animals; D000975:Antioxidants / Q000737:chemistry / Q000494:pharmacology*; D001921:Brain / Q000187:drug effects* / Q000201:enzymology / Q000378:metabolism; D066298:In Vitro Techniques; D015227:Lipid Peroxidation / Q000187:drug effects*; D008297:Male; D051379:Mice; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000737:chemistry / Q000494:pharmacology*; D018384:Oxidative Stress / Q000187:drug effects*; D051381:Rats; D017208:Rats, Wistar; D013691:Tellurium / Q000737:chemistry / Q000494:pharmacology*
chemical_list: D000480:Alkynes; D000975:Antioxidants; D009942:Organometallic Compounds; D013691:Tellurium