4.6 Article

Palmitate alters neuregulin signaling and biology in cardiac myocytes

Journal

Publisher

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2008.11.150

Keywords

Lipotoxicity; Neuregulin; Heregulin; Palmitate; erbB2; erbB4; Heart; Apoptosis

Funding

  1. National Institutes of Health [HL068144]
  2. American Heart Association
  3. Juvenile Diabetes Research Foundation

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The saturated fatty acid palmitate alters normal cell function via disruption of cell signaling, and this effect has been implicated in the end-organ damage associated with dyslipidemia. Neuregulin-1 beta (NRG-1 beta) is a growth and survival factor in cardiac myocytes. We tested the hypothesis that palmitate alters NRG-1 beta signaling and biology in isolated neonatal rat cardiac myocytes. Palmitate treatment inhibited NRG-1 beta activation of the PI3-kinase/Akt pathway in myocytes. We found that the pro-apoptotic activity of palmitate was increased by NRG-1 beta treatment. The effects of palmitate on NRG-1 beta, signaling and Survival were reversed by the mono-unsaturated fatty acid oleate. Under control conditions NRG-1 beta decreases p53 expression in myocytes. In the presence of palmitate, NRG-1 beta caused an increase in p53 expression, bax multimer formation, concurrent with degradation of mdm2, a negative regulator of p53. Thus in the presence of palmitate NRG-1 beta activates pro-apoptotic, rather than pro-survival signaling in cardiac myocytes. (C) 2008 Elsevier Inc. All rights reserved.

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