By oxymetry and electron paramagnetic resonance (EPR), we investigated the effects of repeated anoxia/re-oxygenation (A/R) periods on the respiration and production of free radicals by synoviocytes (rabbit HIG-82 cell line and primary equine synoviocytes) and equine articular chondrocytes. Three periods of 20 min anoxia followed by re-oxygenation were applied to 10(7)cells; O(2) consumption was...

introduction: according  to  the  latest  statistical  and  epidemiological  studies,  copd  will  become  the  fourth  leading  cause  of  death  in  2030  worldwide.  scientists  are  studying  on  methods  to  diagnose  copd  in  the  patients  in  early  stages,  because  it  is  a  curable  and  preventable  disease  in  early  stages.  in  this  study,  evidences  of  hyperinflation  on  ...

Nucleobase radicals are a major family of reactive species produced in DNA as a result of oxidative stress. Two such radicals, 5-hydroxy-5,6-dihydrothymidin-6-yl radical (1) and 5,6-dihydrouridin-6-yl radical (5), were independently generated within chemically synthesized oligonucleotides from photochemical precursors. Neither nucleobase radical produces direct strand breaks or alkali-labile le...

The role of oxidants in the mechanism of tumor promotion by peroxisome proliferators remains controversial. The idea that induction of acyl-coenzyme A oxidase leads to increased production of H(2)O(2), which damages DNA, seems unlikely; still, free radicals might be important in signaling in specialized cell types such as Kupffer cells, which produce mitogens. Because hard evidence for increase...

Mitomycin C (MMC) induced aerobic and hypoxic Cytotoxicity in Chinese hamster V79 cells was studied to evaluate the role of the 1electron versus 2-electron reductive bioactivation. Superoxide dismutase, catatase, and desierai had no protective effects on the aerobic or hypoxic Cytotoxicity of MMC, whereas Tempol and Tempol-H, which are known to interrupt and terminate radical reactions, provide...

Estimation of radical scavenging capacity of lipophilic antioxidants by electron spin resonance (ESR) in vitro is a challenging issue due to their poor solubility in aqueous radical generating and measuring systems. Water-miscible organic solvents are used for this purpose. A novel radical trapping agent, 5-(2,2-dimethyl-1,3-propoxy cyclophosphoryl)-5-methyl-1-pyrroline N-oxide (CYPMPO), that h...

Mitomycin C (MMC) induced aerobic and hypoxic Cytotoxicity in Chinese hamster V79 cells was studied to evaluate the role of the 1electron versus 2-electron reductive bioactivation. Superoxide dismutase, catatase, and desierai had no protective effects on the aerobic or hypoxic Cytotoxicity of MMC, whereas Tempol and Tempol-H, which are known to interrupt and terminate radical reactions, provide...