Synergic PDE3 and PDE4 control intracellular cAMP and cardiac excitation-contraction coupling in a porcine model

Delphine Mika (1) , Pierre Bobin (2) , Marta Lindner , Angèle Boet (3) , Amir Hodzic (4) , Florence Lefebvre (2) , Patrick Lechêne (2) , Malha Sadoune (5) , Jane-Lise Samuel (6) , Vincent Algalarrondo (7) , Catherine Rucker-Martin (8) , Virginie Lambert (9) , Rodolphe Fischmeister (2) , Grégoire Vandecasteele (2) , Jérôme Leroy

1 Université Paris-Sud,
2 Signalisation et physiopathologie cardiaque
3 UP11 UFR Médecine - Université Paris-Sud - Paris 11 - Faculté de médecine
4 CHUM - Centre Hospitalier de l'Université de Montréal
5 Service de biochimie INSERM UMR-S942
6 Centre de Recherche Cardiovasculaire de Lariboisiere
7 Hôpital Antoine Béclère
8 HPPIT - Hypertension arterielle pulmonaire physiopathologie et innovation thérapeutique
9 CCML - Centre Chirurgical Marie Lannelongue

Aims Cyclic AMP phosphodiesterases (PDEs) are important modulators of the cardiac response to β-adrenergic receptor (β-AR) stimulation. PDE3 is classically considered as the major cardiac PDE in large mammals and human, while PDE4 is preponderant in rodents. However, it remains unclear whether PDE4 also plays a functional role in large mammals. Our purpose was to understand the role of PDE4 in cAMP hydrolysis and excitation-contraction coupling (ECC) in the pig heart, a relevant pre-clinical model. Methods and Results Real-time cAMP variations were measured in isolated adult pig right ventricular myocytes (APVMs) using a Förster resonance energy transfer (FRET) biosensor. ECC was investigated in APVMs loaded with Fura-2 and paced at 1 Hz allowing simultaneous measurement of intracellular Ca2+ and sarcomere shortening. The expression of the different PDE4 isoforms was assessed by Western blot in pig right ventricle and APVMs. Similarly to PDE3 inhibition with cilostamide (Cil), PDE4 inhibition with Ro 20-1724 (Ro) increased cAMP levels and inotropy under basal conditions. PDE4 inhibition enhanced the effects of the non-selective β-AR agonist isoprenaline (Iso) and the effects of Cil, and increased spontaneous diastolic Ca2+ waves (SCWs) in these conditions. PDE3A, PDE4A, PDE4B and PDE4D isoforms are expressed in pig ventricle.. In APVMs isolated from a porcine model of repaired tetralogy of Fallot which leads to right ventricular failure, PDE4 inhibition also exerts inotropic and pro-arrhythmic effects. Conclusions Our results show that PDE4 controls ECC in APVMs and suggest that PDE4 inhibitors exert inotropic and pro-arrhythmic effects upon PDE3 inhibition or β-AR stimulation in our pre-clinical model. Thus, PDE4 inhibitors should be used with caution in clinics as they may lead to arrhythmogenic events upon stress.

Domaines: Cardiologie et système cardiovasculaire; Physiologie [q-bio.TO]

Delphine Mika, Pierre Bobin, Marta Lindner, Angèle Boet, Amir Hodzic, et al.. Synergic PDE3 and PDE4 control intracellular cAMP and cardiac excitation-contraction coupling in a porcine model. Journal of Molecular and Cellular Cardiology, 2019, 133, pp.57-66. ⟨10.1016/j.yjmcc.2019.05.025⟩. ⟨hal-02460584⟩