Involvement of endogenous prostaglandins in ischemic preconditioning in pigs.

Abstract:

OBJECTIVE:In pigs, the infarct size (IS) reduction achieved by a strong preconditioning stimulus (IPs) of 10 min ischemia and 15 min reperfusion is greater than that by a weaker preconditioning stimulus (IPw) of 3 min ischemia and 15 min reperfusion. The cardioprotection achieved by IPw is completely abolished by blockade of bradykinin-B(2)-receptors. Since activation of bradykinin-B(2)-receptors subsequently activates cyclooxygenase, we now tested whether or not inhibition of cyclooxygenase with indomethacin interferes with IS reduction by IP. METHODS AND RESULTS:In 42 enflurane-anesthetized pigs, the LAD coronary artery was cannulated, and subendocardial blood flow (ENDO, microspheres, ml/min/g) and IS (%, TTC-staining) were determined. Following 90 min ischemia and 120 min reperfusion, IS averaged 25.5+/-3.8 (S.E.M.) (ENDO: 0.05+/-0.01). IS was reduced by IPw to 6.3+/-2.1 (ENDO: 0.07+/-0.01) and further reduced by IPs to 2.4+/-1.0 (ENDO: 0.06+/-0.01). Indomethacin (10 mg/kg i.v.) did not alter IS per se (20.9+/-5.4, ENDO: 0.06+/-0.02), but completely abolished the IS reduction by IPw (23.2+/-5.9, ENDO: 0.06+/-0.01). In contrast, indomethacin abolished the IS reduction by IPs in only two of seven pigs (16.1+/-7.4, ENDO: 0.05+/-0.01). CONCLUSION:Prostaglandins are involved in IP. However, with stronger IP stimuli other triggers/mediators can compensate for the lack of prostaglandins.

journal_name

Cardiovasc Res

journal_title

Cardiovascular research

authors

Gres P,Schulz R,Jansen J,Umschlag C,Heusch G

doi

10.1016/s0008-6363(01)00505-3

subject

Has Abstract

pub_date

2002-08-15 00:00:00

pages

626-32

issue

3

eissn

0008-6363

issn

1755-3245

pii

S0008636301005053

journal_volume

55

pub_type

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