Ontology type: schema:ScholarlyArticle Open Access: True
2007-11-09
AUTHORSA Caporali, G B Sala-Newby, M Meloni, G Graiani, E Pani, B Cristofaro, A C Newby, P Madeddu, C Emanueli
ABSTRACTNeurotrophins (NTs) control neuron survival and regeneration. Recent research showed that NTs possess cardiovascular actions. In this study, we investigated the hypothesis that the NT nerve growth factor (NGF) prevents cardiomyocyte apoptosis. We demonstrated that cultured rat neonatal cardiomyocytes (RNCMs) produce NGF and express its trkA (tropomyosin-related receptor A (NGF high-affinity receptor)) receptor. RNCMs given a neutralizing antibody for NGF or the trkA inhibitor K252a underwent apoptosis, thus suggesting that NGF is an endogenous prosurvival factor for cardiomyocytes. Adenovirus (Ad)-mediated NGF overexpression protected RNCMs from apoptosis induced by either hypoxia/reoxygenation or angiotensin II (AngII). Similarly, recombinant NGF inhibited AngII-induced apoptosis in isolated rat adult cardiomyocytes. Finally, in a rat model of myocardial infarction, NGF gene transfer promoted cardiomyocyte survival. In RNCMs, recombinant NGF induced trkA phosphorylation, followed by Ser473 phosphorylation and nuclear translocation of phospho-protein kinase B (Akt). In response to Akt activation, Forkhead transcription factors Foxo-3a and Foxo-1 were phosphorylated and excluded from the nucleus. The prosurvival effect of adenoviral vector carrying the human NGF gene was inhibited in vitro by K252a, LY294002 (a pan-phosphatidyl inositol 3-kinase – PI3K – inhibitor), an Akt small interfering RNA, and adenoviruses carrying a dominant negative mutant form of Akt (Ad.DN.Akt) or an Akt-resistant Foxo-3a (Ad.AAA-Foxo-3a). These results newly demonstrate the cardiac prosurvival action of NGF and provide mechanistic information on the signaling pathway, which encompasses trkA, PI3K-Akt, and Foxo. More... »
PAGES299-311
http://scigraph.springernature.com/pub.10.1038/sj.cdd.4402263
DOIhttp://dx.doi.org/10.1038/sj.cdd.4402263
DIMENSIONShttps://app.dimensions.ai/details/publication/pub.1016047744
PUBMEDhttps://www.ncbi.nlm.nih.gov/pubmed/17992191
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