title: Comparative effects of aspartate and glutamate during myocardial ischemia.
abstract: The effects of amino acids aspartate (Asp) and glutamate (Glu) on recovery of contractile function and preservation of compliance were studied in globally ischemic, isolated, blood-perfused cat hearts. Ischemia-induced declines in contractility and compliance were measured with an intraventricular fluid-filled balloon. Asp and Glu were delivered to isolated hearts in physiological salt solution (PSS) containing 10 mM glucose, just prior to, and intermittently during (every 15 min for 1 min) 1 h of normothermic ischemia. Isolated hearts which received Asp and Glu showed recoveries of left ventricular (LV) developed pressure of 79 +/- 8 and 50 +/- 7% of their preischemic values, respectively, compared to 34 +/- 7% in hearts perfused only with PSS. These alterations of contractile function were paralleled by changes in LV compliance. The addition of amino-oxyacetate, and aminotransferase inhibitor, to Asp- containing PSS markedly attenuated the beneficial effects of this amino acid. The results indicate that certain amino acids can protect the ischemic myocardium, presumably through effects on intermediary metabolism.
mesh_terms: D000818:Animals; D001224:Aspartic Acid / Q000627:therapeutic use*; D001794:Blood Pressure / Q000187:drug effects; D002415:Cats; D003327:Coronary Disease / Q000188:drug therapy* / Q000503:physiopathology; D005971:Glutamates / Q000627:therapeutic use*; D018698:Glutamic Acid; D066298:In Vitro Techniques; D009200:Myocardial Contraction
chemical_list: D005971:Glutamates; D001224:Aspartic Acid; D018698:Glutamic Acid