| First Author | Manning JR | Year | 2013 |
| Journal | Am J Physiol Heart Circ Physiol | Volume | 304 |
| Issue | 10 | Pages | H1382-96 |
| PubMed ID | 23479264 | Mgi Jnum | J:197534 |
| Mgi Id | MGI:5493345 | Doi | 10.1152/ajpheart.00613.2012 |
| Citation | Manning JR, et al. (2013) Low molecular weight fibroblast growth factor-2 signals via protein kinase C and myofibrillar proteins to protect against postischemic cardiac dysfunction. Am J Physiol Heart Circ Physiol 304(10):H1382-96 |
| abstractText | Among its many biological roles, fibroblast growth factor-2 (FGF2) acutely protects the heart from dysfunction associated with ischemia/reperfusion (I/R) injury. Our laboratory has demonstrated that this is due to the activity of the low molecular weight (LMW) isoform of FGF2 and that FGF2-mediated cardioprotection relies on the activity of protein kinase C (PKC); however, which PKC isoforms are responsible for LMW FGF2-mediated cardioprotection, and their downstream targets, remain to be elucidated. To identify the PKC pathway(s) that contributes to postischemic cardiac recovery by LMW FGF2, mouse hearts expressing only LMW FGF2 (HMWKO) were bred to mouse hearts not expressing PKCalpha (PKCalphaKO) or subjected to a selective PKCepsilon inhibitor (epsilonV(1-2)) before and during I/R. Hearts only expressing LMW FGF2 showed significantly improved postischemic recovery of cardiac function following I/R (P < 0.05), which was significantly abrogated in the absence of PKCalpha (P < 0.05) or presence of PKCepsilon inhibition (P < 0.05). Hearts only expressing LMW FGF2 demonstrated differences in actomyosin ATPase activity as well as increases in the phosphorylation of troponin I and T during I/R compared with wild-type hearts; several of these effects were dependent on PKCalpha activity. This evidence indicates that both PKCalpha and PKCepsilon play a role in LMW FGF2-mediated protection from cardiac dysfunction and that PKCalpha signaling to the contractile apparatus is a key step in the mechanism of LMW FGF2-mediated protection against myocardial dysfunction. |
