TY - JOUR
T1 - Pyruvate improves myocardial tolerance to reperfusion injury by acting as an antioxidant
T2 - A chemiluminescence study
AU - Crestanello, J. A.
AU - Lingle, D. M.
AU - Millili, J.
AU - Whitman, G. J.
N1 - Funding Information:
Supported by National Institues of Health grant HL 42922.
PY - 1998
Y1 - 1998
N2 - Background. There is indirect evidence that pyruvate improves myocardial tolerance to ischemia by scavenging oxygen radicals during reperfusion. The objectives of this study were to evaluate (1) lucigenin-enhanced chemiluminescence (LEC) as a method to measure oxygen radical (OR) production in vitro and in vivo and (2) the antioxidant effect of pyruvate during myocardial reperfusion. Methods. LEC was measured in vitro by adding to lucigenin (1) increasing concentrations of H2O2, (2) H2O2 and different concentrations of catalase, and (3) H2O2 plus pyruvate. Isolated rat hearts perfused with Krebs Henseleit-Lucigenin inside a chemiluminescence chamber were subjected to equilibration, ischemia, and reperfusion without (control) or with pyruvate. Developed pressure, contractility, compliance, and chemiluminescence were recorded. Results. In vitro, LEC directly correlated with H2O2 concentrations (r2 = 0.997) and decreased in the presence of catalase or pyruvate. During myocardial reperfusion there was a surge of chemiluminescence that peaked at 4 minutes. Pyruvate decreased the initial reperfusion peak (9.8 ± 0.3 x 103 cpm in pyruvate group vs 12.4 ± 0.9 x 103 cpm in control; p < 0.05) and the total amount of chemiluminescence generated during reperfusion (65.7 ± 12 x 103 in pyruvate group vs 117.1 ± 8.2 x 103 counts in control; p < 0.05). Pyruvate improved recovery of function after ischemia reperfusion. Conclusions. LEC is a sensitive indicator of H2O2 concentrations and can evaluate the effect of antioxidants in vitro. It is a continuous, sensitive, and direct measurement of OR production in vivo. LEC is ideal for the evaluation of antioxidant interventions and provides direct evidence that pyruvate acts as an antioxidant while improving myocardial function during reperfusion.
AB - Background. There is indirect evidence that pyruvate improves myocardial tolerance to ischemia by scavenging oxygen radicals during reperfusion. The objectives of this study were to evaluate (1) lucigenin-enhanced chemiluminescence (LEC) as a method to measure oxygen radical (OR) production in vitro and in vivo and (2) the antioxidant effect of pyruvate during myocardial reperfusion. Methods. LEC was measured in vitro by adding to lucigenin (1) increasing concentrations of H2O2, (2) H2O2 and different concentrations of catalase, and (3) H2O2 plus pyruvate. Isolated rat hearts perfused with Krebs Henseleit-Lucigenin inside a chemiluminescence chamber were subjected to equilibration, ischemia, and reperfusion without (control) or with pyruvate. Developed pressure, contractility, compliance, and chemiluminescence were recorded. Results. In vitro, LEC directly correlated with H2O2 concentrations (r2 = 0.997) and decreased in the presence of catalase or pyruvate. During myocardial reperfusion there was a surge of chemiluminescence that peaked at 4 minutes. Pyruvate decreased the initial reperfusion peak (9.8 ± 0.3 x 103 cpm in pyruvate group vs 12.4 ± 0.9 x 103 cpm in control; p < 0.05) and the total amount of chemiluminescence generated during reperfusion (65.7 ± 12 x 103 in pyruvate group vs 117.1 ± 8.2 x 103 counts in control; p < 0.05). Pyruvate improved recovery of function after ischemia reperfusion. Conclusions. LEC is a sensitive indicator of H2O2 concentrations and can evaluate the effect of antioxidants in vitro. It is a continuous, sensitive, and direct measurement of OR production in vivo. LEC is ideal for the evaluation of antioxidant interventions and provides direct evidence that pyruvate acts as an antioxidant while improving myocardial function during reperfusion.
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U2 - 10.1016/S0039-6060(98)70080-7
DO - 10.1016/S0039-6060(98)70080-7
M3 - Article
C2 - 9663257
AN - SCOPUS:0031950414
SN - 0039-6060
VL - 124
SP - 92
EP - 99
JO - Surgery
JF - Surgery
IS - 1
ER -