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Energy signalling and cardiovascular pathophysiology

 

VEKSLER Vladimir, PU UPSud : Team leadere1-fig1
GARNIER-FAGART Anne, MCU UPSud : Team leader
VENTURA-CLAPIER Renée, DR Emérite Cnrs
LEMAIRE Christophe, MCU UVSQ
MERICSKAY Mathias, CR1 Inserm
PIQUEREAU Jerôme, MCU UPSud
GRESSETTE Mélanie, IE UPSUD
DELOUX Robin, PhD Student
GRIMBERT Lucile, PhD Student
MONCEAUX Kévin, PhD Student
PIRES DA SILVA Julie, PhD Student

 

Cellular bioenergetic can be defined as the study of integrated biochemical and biophysical processes of energy conversion, and of their regulation. This discipline is particularly relevant to cardiac and skeletal muscle pathologies, first of all, to heart failure (HF). Indeed, the severity of energy state of the failing myocardium proved to be a prognostic factor of mortality in HF patients. Moreover, HF patients suffer from exercise disability and abnormal fatigue linked in part to muscle weakness. Energetic deficiency also affects skeletal muscle and diaphragm evidencing the concept of “generalized metabolic myopathy of HF”. This physical handicap affects their quality of life and work ability. Despite involvement of energy metabolism in the pathophysiology of HF, our knowledge of its regulation is still rudimentary, at the fundamental as well as pathophysiological and therapeutic levels.

 

e1-fig2Cardiac and skeletal muscles are characterized by a wide functional diversity, high and fluctuating energy needs and a variety of cell signaling pathways controlling energy metabolism. These pathways are intimately linked to cell architecture and compartmentalized enzyme systems and efficient and tissue specific systems of energy production and transfer. All these characteristics are altered in failing cardiac and skeletal muscles. This fact points to the importance of fundamental and applied studies of energy signaling in muscle cells.

 

Our aim is to better understand the modulation of energy metabolism and energy fluxes in cardiac and skeletal muscle cells in physiological and pathological conditions, starting from the study of subcellular compartments and their interactions to integrated physiology.

 

We have pursued three main lines of research:

 

- We study how cytoarchitecture, molecular composition and energetic of myocytes and their interactions determine contractile function.

 

- We progress in the identification of the extracellular signals and signaling pathways involved in energetic plasticity of healthy and pathologic cardiomyocytes.

 

- We demonstrate the involvement of the transcriptional regulation of mitochondrial biogenesis in heart failure and studied the energetic status of the myocardium of congestive HF patients and heart transplant recipients. We have delineated the beneficial effects of exercise training on energy metabolism in cardiac and skeletal muscle of in HF.