Kinetic Changes of COX-2 Expression during Reperfusion Period after Ischemic Preconditioning Play a Role in Protection Against Ischemic Damage in Rat Brain.
10.4196/kjpp.2008.12.5.275
- Author:
Young Jin KANG
1
;
Min Kyu PARK
;
Hyun Suk LEE
;
Hyoung Chul CHOI
;
Kwang Youn LEE
;
Hye Jung KIM
;
Han Geuk SEO
;
Jae Heun LEE
;
Ki Churl CHANG
Author Information
1. Department of Pharmacology and Aging-associated Vascular Disease Research Center, College of Medicine, Yeungnam University, Daegu, Korea.
- Publication Type:Original Article
- Keywords:
Ischemic preconditioning;
Stroke;
Heme oxygenase;
Cyclooxygenase
- MeSH:
Animals;
Brain;
Heme Oxygenase (Decyclizing);
Indomethacin;
Ischemia;
Ischemic Preconditioning;
Lactones;
Middle Cerebral Artery;
Prostaglandin-Endoperoxide Synthases;
Rats;
Reperfusion;
Stroke;
Sulfones
- From:The Korean Journal of Physiology and Pharmacology
2008;12(5):275-280
- CountryRepublic of Korea
- Language:English
-
Abstract:
A brief ischemic insult induces significant protection against subsequent massive ischemic events. The molecular mechanisms known as preconditioning (PC)-induced ischemic tolerance are not completely understood. We investigated whether kinetic changes of cyclooxygenase (COX)-2 during reperfusion time-periods after PC were related to ischemic tolerance. Rats were given PC by occlusion of middle cerebral artery (MCAO) for 10 min and sacrificed after the indicated time-periods of reperfusion (1, 2, 4, 8, 12, 18 or 24 h). In PC-treated rats, focal ischemia was induced by occlusion of MCA for 24 h and brain infarct volume was then studied to determine whether different reperfusion time influenced the damage. We report that the most significant protection against focal ischemia was obtained in rats with 8 h reperfusion after PC. Administration of indomethacin (10 mg/kg, oral) or rofecoxib (5 mg/kg, oral) 48 h prior to PC counteracted the effect of PC. Immunohistochemical analysis showed that COX-2 and HO-1 protein were induced in PC-treated rat brain, which was significantly inhibited by rofecoxib. Taken together, we concluded that the kinetic changes of COX-2 expression during the reperfusion period after PC might be partly responsible for ischemic tolerance.
