Related Experiment Videos
Myocardial protection of MCI-186 in rabbit ischemia-reperfusion
Tai-Wing Wu1, Ling-Hua Zeng, Jun Wu
1Department of Clinical Biochemistry, University of Toronto and Center for Cardiovascular Research, The Toronto Hospital, Western Division, Canada. taiwu@hotmail.com
Abstract:
We observed that 3-methyl-1-1phenyl-2-pyrazolin-5-one (MCI-186), a newly-developed free radical scavenger, attenuated necrosis in the in vivo rabbit hearts upon reperfusion after prolonged ischemia. In rabbits undergoing 1 hour ligation of the anterior ventricular coronary artery, a single bolus injection of MCI-186 (1.5 mg/kg) was introduced into the post-ischemic heart immediately before 4 hour reperfusion. Compared to negligible necrosis in sham-operated control animals and 33.81 +/- 13.50% necrosis in the area at risk for the saline control group (n = 8), the MCI-186 - treated group (n = 8) had a necrosis of 13.27 +/- 4.60% (p < 0.05 vs saline control group). The pressure-rate index had a slight decrease in MCI-186 treated group compared to the control group (p > 0.05). However, the blood levels of malondialdehyde (MDA) in MCI-186 treated group (2.08 +/- 0.23 microM) was significantly smaller than that of 2.65 +/- 0.31 microM in control animals (p < 0.01), while sham control had an average MDA level of 1.91 +/- 0.40 microM, with p > 0.05 relative to that in the MCI-186 treated group. These data support our contention that MCI-186 reduces reperfusion injury in perfused hearts with prolonged ischemia and the mechanism for the in vivo efficacy of MCI-186 is predominantly related to its antioxidant activities.
Insights
3-methyl-1-1phenyl-2-pyrazolin-5-one (MCI-186), a novel free radical scavenger, significantly reduced heart necrosis in rabbits after ischemia and reperfusion. Its antioxidant activity is key to protecting against reperfusion injury.
Area of Science:
- Cardiology
- Pharmacology
- Biochemistry
Background:
- Ischemia-reperfusion injury is a major cause of heart damage.
- Free radical scavenging is a potential therapeutic strategy.
- 3-methyl-1-1phenyl-2-pyrazolin-5-one (MCI-186) is a novel antioxidant.
Purpose of the Study:
- To evaluate the efficacy of MCI-186 in reducing myocardial necrosis in a rabbit model of ischemia-reperfusion.
- To investigate the mechanism of MCI-186's protective effects.
Main Methods:
- Rabbits underwent 1-hour coronary artery ligation followed by 4-hour reperfusion.
- MCI-186 (1.5 mg/kg) or saline was administered before reperfusion.
- Necrosis area, pressure-rate index, and malondialdehyde (MDA) levels were measured.
Main Results:
- MCI-186 significantly reduced infarct size (13.27% vs 33.81% in controls, p < 0.05).
- Blood MDA levels were significantly lower in the MCI-186 group (2.08 microM vs 2.65 microM, p < 0.01).
- Pressure-rate index showed no significant difference between groups.
Conclusions:
- MCI-186 effectively attenuates myocardial necrosis following prolonged ischemia and reperfusion.
- The primary mechanism of MCI-186's protective effect is its potent antioxidant activity.
- MCI-186 shows promise as a therapeutic agent for reducing reperfusion injury.