title: Inhibition of cardiac mitochondrial respiration by salicylic acid and acetylsalicylate.
abstract: Acetylsalicylate, the active ingredient in aspirin, has been shown to be beneficial in the treatment and prevention of cardiovascular disease. Because of the increasing frequency with which salicylates are used, it is important to more fully characterize extra- and intracellular processes that are altered by these compounds. Evidence is provided that treatment of isolated cardiac mitochondria with salicylic acid and to a lesser extent acetylsalicylate resulted in an increase in the rate of uncoupled respiration. In contrast, both compounds inhibited ADP-dependent NADH-linked (state 3) respiration to similar degrees. Under the conditions of our experiments, loss in state 3 respiration resulted from inhibition of the Krebs cycle enzyme alpha-ketoglutarate dehydrogenase (KGDH). Kinetic analysis indicates that salicylic acid acts as a competitive inhibitor at the alpha-ketoglutarate binding site. In contrast, acetylsalicylate inhibited the enzyme in a noncompetitive fashion consistent with interaction with the alpha-ketoglutarate binding site followed by enzyme-catalyzed acetylation. The effects of salicylic acid and acetylsalicylate on cardiac mitochondrial function may contribute to the known cardioprotective effects of therapeutic doses of aspirin, as well as to the toxicity associated with salicylate overdose.
authors.affiliation: Department of Physiology and Biophysics, Case Western Reserve University, Cleveland, Ohio, USA.
authors.forename: Amy C
authors.initials: AC
authors.lastname: Nulton-Persson
authors.forename: Luke I
authors.initials: LI
authors.lastname: Szweda
authors.forename: Hesham A
authors.initials: HA
authors.lastname: Sadek
mesh_terms: D000818:Animals; D001241:Aspirin / Q000737:chemistry / Q000494:pharmacology*; D019069:Cell Respiration / Q000187:drug effects / Q000502:physiology; D002952:Citric Acid Cycle / Q000187:drug effects / Q000502:physiology; D004140:Dinitrophenols / Q000494:pharmacology; D004353:Drug Evaluation, Preclinical / Q000379:methods; D004579:Electron Transport / Q000187:drug effects; D007655:Ketoglutarate Dehydrogenase Complex / Q000037:antagonists & inhibitors / Q000187:drug effects; D008929:Mitochondria, Heart / Q000187:drug effects* / Q000473:pathology* / Q000502:physiology; D009243:NAD / Q000037:antagonists & inhibitors / Q000187:drug effects / Q000502:physiology; D010101:Oxygen Consumption / Q000187:drug effects / Q000502:physiology; D051381:Rats; D017207:Rats, Sprague-Dawley; D020156:Salicylic Acid / Q000494:pharmacology*; D012508:Sarcolemma / Q000473:pathology; D014475:Uncoupling Agents / Q000494:pharmacology
chemical_list: D004140:Dinitrophenols; D014475:Uncoupling Agents; D009243:NAD; D007655:Ketoglutarate Dehydrogenase Complex; D020156:Salicylic Acid; D001241:Aspirin