RT Journal Article SR Electronic T1 THE EFFECTS OF REDUCED GLUTATHIONE AND RELATED SUBSTANCES ON THE THRESHOLD OF IRRITABILITY OF MAMMALIAN VENTRICULAR MUSCLE JF Journal of Pharmacology and Experimental Therapeutics JO J Pharmacol Exp Ther FD American Society for Pharmacology and Experimental Therapeutics SP 300 OP 304 VO 115 IS 3 A1 Garb, Solomon A1 Scriabine, Alexander A1 Penna, Mario A1 Fujimori, Hiroshi A1 Kirk, Ann A1 Hardy, Robert YR 1955 UL http://jpet.aspetjournals.org/content/115/3/300.abstract AB Reduced glutathione produced a marked lowering of the threshold of irritability of the cat papillary muscle but did not change contractile force. On the other hand, methionine did not change irritability but increased contractile force. Cysteine lowered the threshold of irritability and increased contractile force. These findings suggest that different metabolic cycles may be involved in furnishing energy for the various aspects of cardiac muscle function. Reduced glutathione may prove useful in some cases of diminished ventricular irritability.