Abstract
The ability of cardiomyocytes to detect mechanical and humoral stimuli is critical for adaptation of the myocardium in response to new conditions and for sustaining the increased workload during stress. While certain stimuli mediate a beneficial adaptation to stress conditions, others result in maladaptive remodelling, ultimately leading to heart failure. Specific signalling pathways activating either adaptive or maladaptive cardiac remodelling have been identified. Paradoxically, however, in a number of cases, the transduction pathways involved in such opposing responses engage the same signalling proteins. A notable example is the Raf–MEK1/2–ERK1/2 signalling pathway that can control both adaptive and maladaptive remodelling. ERK1/2 signalling requires a signalosome complex where a scaffold protein drives the assembly of these three kinases into a linear pathway to facilitate their sequential phosphorylation, ultimately targeting specific effector molecules. Interestingly, a number of different Raf–MEK1/2–ERK1/2 scaffold proteins have been identified, and their role in determining the adaptive or maladaptive cardiac remodelling is a promising field of investigation for the development of therapeutic strategies capable of selectively potentiating the adaptive response.
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Acknowledgments
We wish to thank R. Srinivasan for manuscript revision. This work was supported by grants from the Regione Piemonte POR F.E.S.R.2007/2013 “DRUIDI: Piattaforme Innovative per le Scienze della Vita” to G.T. and M.B., Telethon GGP12047 to G.T., FIRB RBFR10L0GK to M.S., PRIN 2010J8RYS7 to M.B. and PRIN 2010RNXM9C to G.T.
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Tarone, G., Sbroggiò, M. & Brancaccio, M. Key role of ERK1/2 molecular scaffolds in heart pathology. Cell. Mol. Life Sci. 70, 4047–4054 (2013). https://doi.org/10.1007/s00018-013-1321-5
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DOI: https://doi.org/10.1007/s00018-013-1321-5