| First Author | Barandon L | Year | 2005 |
| Journal | Circ Res | Volume | 96 |
| Issue | 12 | Pages | 1299-306 |
| PubMed ID | 15920021 | Mgi Jnum | J:110294 |
| Mgi Id | MGI:3639833 | Doi | 10.1161/01.RES.0000171895.06914.2c |
| Citation | Barandon L, et al. (2005) Involvement of FrzA/sFRP-1 and the Wnt/frizzled pathway in ischemic preconditioning. Circ Res 96(12):1299-306 |
| abstractText | Phosphorylation and subsequent inactivation of glycogen synthase kinase (GSK)-3beta via the Akt/PI3-Kinase pathway during ischemic preconditioning (PC) has been shown to be cardioprotective. As FrzA/sFRP-1, a secreted antagonist of the Wnt/Frizzled pathway, is expressed in the heart and is able to decrease the phosphorylation of GSK-3beta in vitro on vascular cells, we examined its effect during PC using transgenic mouse overexpressing FrzA in cardiomyocytes (alpha-MHC promoter) under a conditional transgene expression approach (tet-off system). Overexpression of FrzA inhibited the increase in GSK-3beta phosphorylation as well as protein kinase C (PKC) epsilon activation in transgenic mice after PC as compared with littermates. Phospho-Akt (P-Akt), phospho-JNK, or the cytoplasmic beta-catenin levels were not modified, phospho-p38 (P-p38) was slightly increased in transgenic mice after PC as compared with littermates. FrzA transgenic mice displayed a larger infarct size and a greater worsening of cardiac function compared with littermates. All these differences were reversed by the addition of doxycycline. This study demonstrates for the first time that disruption of a beta-catenin independent Wnt/Frizzled pathway induces the activation of GSK-3beta and reverses the benefit of preconditioning. |
