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Article Dans Une Revue Cardiovascular Research Année : 2019

Cardiac adenylyl cyclase overexpression precipitates and aggravates age-related myocardial dysfunction

Delphine Mika
  • Fonction : Auteur
Gabor Czibik
  • Fonction : Auteur
Elisabeth Marcos
  • Fonction : Auteur
Shariq Abid
  • Fonction : Auteur
Amal Houssaini
  • Fonction : Auteur
Benjamin Vallin
  • Fonction : Auteur
Aziz Guellich
  • Fonction : Auteur
Hind Mehel
  • Fonction : Auteur
Daigo Sawaki
  • Fonction : Auteur
Gregoire Vandecasteele
  • Fonction : Auteur
Rodolphe Fischmeister
Roger J Hajjar
  • Fonction : Auteur
Jean-Luc Dubois-Randé
  • Fonction : Auteur
Isabelle Limon
  • Fonction : Auteur
Serge Adnot
  • Fonction : Auteur
Genevieve Derumeaux
  • Fonction : Auteur
Larissa Lipskaia
  • Fonction : Auteur

Résumé

Abstract Aims Increase of cardiac cAMP bioavailability and PKA activity through adenylyl-cyclase 8 (AC8) overexpression enhances contractile function in young transgenic mice (AC8TG). Ageing is associated with decline of cardiac contraction partly by the desensitization of β-adrenergic/cAMP signalling. Our objective was to evaluate cardiac cAMP signalling as age increases between 2 months and 12 months and to explore whether increasing the bioavailability of cAMP by overexpression of AC8 could prevent cardiac dysfunction related to age. Methods and results Cardiac cAMP pathway and contractile function were evaluated in AC8TG and their non-transgenic littermates (NTG) at 2- and 12 months old. AC8TG demonstrated increased AC8, PDE1, 3B and 4D expression at both ages, resulting in increased phosphodiesterase and PKA activity, and increased phosphorylation of several PKA targets including sarco(endo)plasmic-reticulum-calcium-ATPase (SERCA2a) cofactor phospholamban (PLN) and GSK3α/β a main regulator of hypertrophic growth and ageing. Confocal immunofluorescence revealed that the major phospho-PKA substrates were co-localized with Z-line in 2-month-old NTG but with Z-line interspace in AC8TG, confirming the increase of PKA activity in the compartment of PLN/SERCA2a. In both 12-month-old NTG and AC8TG, PLN and GSK3α/β phosphorylation was increased together with main localization of phospho-PKA substrates in Z-line interspaces. Haemodynamics demonstrated an increased contractile function in 2- and 12-month-old AC8TG, but not in NTG. In contrast, echocardiography and tissue Doppler imaging (TDI) performed in conscious mice unmasked myocardial dysfunction with a decrease of systolic strain rate in both old AC8TG and NTG. In AC8TG TDI showed a reduced strain rate even in 2-month-old animals. Development of age-related cardiac dysfunction was accelerated in AC8TG, leading to heart failure (HF) and premature death. Histological analysis confirmed early cardiomyocyte hypertrophy and interstitial fibrosis in AC8TG when compared with NTG. Conclusion Our data demonstrated an early and accelerated cardiac remodelling in AC8TG mice, leading to the development of HF and reduced lifespan. Age-related reorganization of cAMP/PKA signalling can accelerate cardiac ageing, partly through GSK3α/β phosphorylation.
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Dates et versions

hal-02463715 , version 1 (01-02-2020)

Identifiants

Citer

Nathalie Mougenot, Delphine Mika, Gabor Czibik, Elisabeth Marcos, Shariq Abid, et al.. Cardiac adenylyl cyclase overexpression precipitates and aggravates age-related myocardial dysfunction. Cardiovascular Research, 2019, 115 (12), pp.1778-1790. ⟨10.1093/cvr/cvy306⟩. ⟨hal-02463715⟩
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