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The Development of Compartmentation of cAMP Signaling in Cardiomyocytes: The Role of T-Tubules and Caveolae Microdomains

Department of Cardiovascular Sciences, National Heart and Lung Institute, Imperial College London, London W12 0NN, UK
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J. Cardiovasc. Dev. Dis. 2018, 5(2), 25; https://doi.org/10.3390/jcdd5020025
Received: 23 February 2018 / Revised: 18 April 2018 / Accepted: 28 April 2018 / Published: 3 May 2018
(This article belongs to the Special Issue Cyclic Nucleotide Signaling and the Cardiovascular System)
3′-5′-cyclic adenosine monophosphate (cAMP) is a signaling messenger produced in response to the stimulation of cellular receptors, and has a myriad of functional applications depending on the cell type. In the heart, cAMP is responsible for regulating the contraction rate and force; however, cAMP is also involved in multiple other functions. Compartmentation of cAMP production may explain the specificity of signaling following a stimulus. In particular, transverse tubules (T-tubules) and caveolae have been found to be critical structural components for the spatial confinement of cAMP in cardiomyocytes, as exemplified by beta-adrenergic receptor (β-ARs) signaling. Pathological alterations in cardiomyocyte microdomain architecture led to a disruption in compartmentation of the cAMP signal. In this review, we discuss the difference between atrial and ventricular cardiomyocytes in respect to microdomain organization, and the pathological changes of atrial and ventricular cAMP signaling in response to myocyte dedifferentiation. In addition, we review the role of localized phosphodiesterase (PDE) activity in constraining the cAMP signal. Finally, we discuss microdomain biogenesis and maturation of cAMP signaling with the help of induced pluripotent stem cell-derived cardiomyocytes (iPSC-CMs). Understanding these mechanisms may help to overcome the detrimental effects of pathological structural remodeling. View Full-Text
Keywords: cAMP; phosphodiesterase; FRET; atrial; ventricle; iPSC-CMs; T-tubule; caveolae; development cAMP; phosphodiesterase; FRET; atrial; ventricle; iPSC-CMs; T-tubule; caveolae; development
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Bhogal, N.K.; Hasan, A.; Gorelik, J. The Development of Compartmentation of cAMP Signaling in Cardiomyocytes: The Role of T-Tubules and Caveolae Microdomains. J. Cardiovasc. Dev. Dis. 2018, 5, 25.

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