Myocardial antioxidant defense mechanisms: time related changes after reperfusion of the ischemic rat heart.

Abstract:

:It is well known that reperfusion damage of ischemic myocardium may be attributed to alterations in the antioxidant defense system against free radical aggression. In addition, the degree of myocardial damage may depend on the duration and severity of ischemia that precedes reperfusion. We carried out serial ischemic experiments (10, 30, 60 and 120 min) in ex-vivo rat hearts followed by 30 min reperfusion and we assayed the glutathione-dependent enzymatic activities (selenium-dependent glutathione-peroxidase: GSH-Px; selenium-independent glutathione peroxidase: GST-Px; glutathione-transferase: GST and glutathione-reductase: GS-SG-Red), Catalase activity (CAT) and non-proteic thiol compounds (NP-SH) at the end of reperfusion. We found a significant reduction of NP-SH, GSH-Px and CAT in ischemic/reperfused hearts from 30 min on, while GST activity was increased. In addition, we observed the appearance of a selenium-independent glutathione peroxidase activity (GST-Px) belonging to the GST system. In conclusion, we found the longer the duration of ischemia the greater the inbalance between the myocardial antioxidant system especially the GST activation, suggesting in particular for GST-Px, a role in the control of the damage against oxygen toxicity during ischemia/reperfusion.

journal_name

Free Radic Res

journal_title

Free radical research

authors

Porreca E,Del Boccio G,Lapenna D,Di Febbo C,Pennelli A,Cipollone F,Di Ilio C,Cuccurullo F

doi

10.3109/10715769409147514

subject

Has Abstract

pub_date

1994-03-01 00:00:00

pages

171-9

issue

3

eissn

1071-5762

issn

1029-2470

journal_volume

20

pub_type

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