title: Effect of garlic-derived organosulfur compounds on mitochondrial function and integrity in isolated mouse liver mitochondria.
abstract: The objectives of this work were to evaluate the direct effects of diallysulfide (DAS) and diallyldisulfide (DADS), two major organosulfur compounds of garlic oil, on mitochondrial function and integrity, by using isolated mouse liver mitochondria in a cell-free system. DADS produced concentration-dependent mitochondrial swelling over the range 125-1000μM, while DAS was ineffective. Swelling experiments performed with de-energized or energized mitochondria showed similar maximal swelling amplitudes. Cyclosporin A (1μM), or ethylene glycol-bis(2-aminoethylether)-N,N,N',N'-tetraacetic acid (EGTA, 1mM) were ineffective in inhibiting DADS-induced mitochondrial swelling. DADS produced a minor (12%) decrease in mitochondrial membrane protein thiols, but did not induce clustering of mitochondrial membrane proteins. Incubation of mitochondria with DADS (but not DAS) produced an increase in the oxidation rate of 2',7' dichlorofluorescein diacetate (DCFH-DA), together with depletion of reduced glutathione (GSH) and increased lipid peroxidation. DADS (but not DAS) produced a concentration-dependent dissipation of the mitochondrial membrane potential, but did not induce cytochrome c release. DADS-dependent effects, including mitochondrial swelling, DCFH-DA oxidation, lipid peroxidation and loss of mitochondrial membrane potential, were inhibited by antioxidants and iron chelators. These results suggest that DADS causes direct impairment of mitochondrial function as the result of oxidation of the membrane lipid phase initiated by the GSH- and iron-dependent generation of oxidants.
authors.affiliation: Chemistry Department, Hendrix College, Conway, AR, United States. caro@hendrix.edu
authors.forename: Andres A
authors.initials: AA
authors.lastname: Caro
authors.forename: Luke W
authors.initials: LW
authors.lastname: Adlong
authors.forename: Samuel J
authors.initials: SJ
authors.lastname: Crocker
authors.forename: Michael W
authors.initials: MW
authors.lastname: Gardner
authors.forename: Emily F
authors.initials: EF
authors.lastname: Luikart
authors.forename: Liz U
authors.initials: LU
authors.lastname: Gron
mesh_terms: D000498:Allyl Compounds / Q000037:antagonists & inhibitors / Q000633:toxicity*; D000818:Animals; D002474:Cell-Free System; D016572:Cyclosporine / Q000494:pharmacology; D045304:Cytochromes c / Q000378:metabolism; D004220:Disulfides / Q000037:antagonists & inhibitors / Q000633:toxicity*; D005260:Female; D005434:Flow Cytometry; D005978:Glutathione / Q000378:metabolism; D008099:Liver / Q000187:drug effects* / Q000201:enzymology / Q000378:metabolism; D053078:Membrane Potential, Mitochondrial / Q000187:drug effects* / Q000502:physiology; D051379:Mice; D008930:Mitochondria, Liver / Q000187:drug effects* / Q000378:metabolism; D008933:Mitochondrial Swelling / Q000187:drug effects* / Q000502:physiology; D017382:Reactive Oxygen Species / Q000378:metabolism; D013440:Sulfides / Q000633:toxicity*
chemical_list: D000498:Allyl Compounds; D004220:Disulfides; D017382:Reactive Oxygen Species; D013440:Sulfides; C028009:diallyl disulfide; C038491:allyl sulfide; D016572:Cyclosporine; D045304:Cytochromes c; D005978:Glutathione