title: Cholesterol protects Acholeplasma laidlawii against oxidative damage caused by hydrogen peroxide.
abstract: The aim of this study was to determine whether cholesterol, added to the cell growth medium or to cell suspension buffer, could protect Acholeplasma laidlawii cells against the toxic effects of hydrogen peroxide (H(2)O(2)). Variable concentrations of cholesterol (0.05-1.0 mg/ml) were added to the A. laidlawii suspension buffer and to the growth medium. Cells were then washed carefully and incubated with 0.001% (v/v) H(2)O(2) at 37 degrees C for 30 min and the viability was determined. The results indicated that cells were more viable in the presence of cholesterol than were cells grown in the absence of cholesterol. In addition, the oxygen uptake rate resulting from the oxidation of 5.5 mmol/L glucose was 2-fold and 4-fold higher for cells grown in medium supplemented with 0.05 and 0.50 mg/ml cholesterol, respectively, compared to cells grown in a medium with no added cholesterol. These findings indicate that cholesterol might play a role in protecting Mollicutes against the oxidative damage caused by H(2)O(2).
authors.affiliation: Biological and Medical Research Department, King Faisal Specialist Hospital and Research Center (MBC-03), Riyadh, Saudi Arabia. kamero@kfshrc.edu.sa
authors.forename: K K
authors.initials: KK
authors.lastname: Abu-Amero
authors.forename: R J
authors.initials: RJ
authors.lastname: Miles
authors.forename: M A
authors.initials: MA
authors.lastname: Halablab
mesh_terms: D000128:Acholeplasma laidlawii / Q000187:drug effects*; D000818:Animals; D002784:Cholesterol / Q000737:chemistry / Q000494:pharmacology*; D003470:Culture Media / Q000737:chemistry; D006861:Hydrogen Peroxide / Q000633:toxicity*; D018384:Oxidative Stress
chemical_list: D003470:Culture Media; D002784:Cholesterol; D006861:Hydrogen Peroxide