Cardioprotective effects of epoxyeicosatrienoic acids (EETs) have been demonstrated in models of young mice with either the cardiomyocyte specific over-expression of cytochrome P450 2J2 (CYP2J2 Tr) or deletion of soluble epoxide hydrolase (sEH null). In this study we examined differences in EET-induced cardioprotection in young (2 months) and aged (12 months) CYP2J2 Tr and sEHnull mice using Langendorff isolated perfused heart model. Improved postischemic functional recovery was observed in both young and aged sEH null mice compared to age matched WT. Conversely, the cardioprotective effect observed in young CYP2J2 Tr was lost in aged CYP2J2 Tr mice. The loss of cardioprotection in aged CYP2J2 Tr was regained following perfusion with the sEH inhibitor t-AUCB. Data demonstrated increased levels of leukotoxin diol (DiHOME) and oxidative stress as well decreased protein phosphatase 2A (PP2A) activation in aged CYP2J2 Tr. In conclusion, inhibition of sEH and EET-induced cardioprotection is maintained in aged mice. However, the loss of protective effects observed in aged CYP2J2 Tr might be attributed to increased levels of DiHOME, oxidative stress and/or decreased PP2A activity.
|Original language||English (US)|
|Number of pages||10|
|Journal||Prostaglandins and Other Lipid Mediators|
|State||Published - Jul 2013|
Bibliographical noteFunding Information:
KRC is the recipient of the Doctoral Research Award from the Heart and Stroke Foundation of Canada and the Studentship award from the Alberta Innovates-Health Solutions. JMS is the recipient of a New Investigator Award from the Heart and Stroke Foundation of Canada and a Health Scholar Award from the Alberta Innovates- Health Solutions. This work was supported by grant from Heart and Stroke Foundation of Canada (JMS) .
- Cytochrome P450
- Epoxyeicosatrienoic acids
- Ischemia reperfusion injury
- Leukotoxin diol
- Soluble epoxide hydrolase inhibitor