Effect of brief regional ischemia followed by reperfusion with or without superoxide dismutase and catalase administration on myocardial sarcoplasmic reticulum and contractile function
| Autor: | Bryan E. Fuhs, Roger B. Rehr, Jerry I. Hirsch, Joseph J. Feher |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
Male
medicine.medical_specialty Ruthenium red Time Factors Sarcoplasm Drug Evaluation Preclinical Ischemia Coronary Disease Myocardial Reperfusion Myocardial Reperfusion Injury Superoxide dismutase chemistry.chemical_compound Dogs Bolus (medicine) Coronary Circulation Internal medicine medicine Animals biology Superoxide Dismutase business.industry Endoplasmic reticulum Fissipedia Heart Catalase medicine.disease biology.organism_classification Myocardial Contraction Surgery Disease Models Animal Sarcoplasmic Reticulum Endocrinology chemistry biology.protein Female Cardiology and Cardiovascular Medicine business |
| Zdroj: | American Heart Journal. 122:1257-1269 |
| ISSN: | 0002-8703 |
| DOI: | 10.1016/0002-8703(91)90564-x |
| Popis: | The effect of reperfusion with and without free radical scavengers on sarcoplasmic reticulum and contractile function was examined in a canine model of 15-minute coronary artery occlusion followed by reperfusion. Dogs were reperfused with (n = 13) or without (n = 16) superoxide dismutase and catalase or were killed at 15 minutes of ischemia (n = 17). Superoxide dismutase and catalase were administered as a bolus (20,000 and 12,500 U/kg, respectively) beginning 1.25 minutes before reperfusion followed by infusion of 16,000 and 12,500 U/kg/hr, respectively. Sarcoplasmic reticulum function was evaluated from the rate of calcium uptake of unfractionated subepicardial, subendocardial, and transmural homogenates determined with and without ruthenium red to close the calcium release channel. Mechanical function was evaluated by means of sonomicrometry. Fifteen minutes of ischemia significantly (p less than 0.05) depressed the sarcoplasmic reticulum calcium uptake rate only in the subendocardium (from 25 +/- 2 to 14 +/- 1 nmol/min/mg without ruthenium red and from 60 +/- 3 to 49 +/- 3 nmol/min/mg with ruthenium red). Reperfusion with or without superoxide dismutase and catalase restored homogenate calcium uptake rates to normal, although severe contractile dysfunction persisted. This indicates that damage to the sarcoplasmic reticulum may not be the major cause of postreperfusion contractile dysfunction. Ischemia-reperfusion caused a decrease in systolic shortening from 19 +/- 2% to 1 +/- 2% with and from 18 +/- 1% to 4 +/- 1% without free radical scavengers (p = NS between groups). Thus administration of superoxide dismutase and catalase beginning shortly before reperfusion had no effect on postreperfusion contractile dysfunction or sarcoplasmic reticulum function. |
| Databáze: | OpenAIRE |
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