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Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
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Managing cardiomyopathy involves addressing underlying or precipitating causes, treating heart failure with medications, and implementing dietary changes and a balanced exercise and rest regimen.Lifestyle ModificationsCardiomyopathy patients should adopt a low-sodium diet to reduce fluid retention and manage heart failure. A personalized exercise and rest plan helps maintain physical fitness without overstraining the heart. Avoiding alcohol and tobacco is essential to prevent further damage to...
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Dilated cardiomyopathy, or DCM, is a progressive myocardial disorder characterized by ventricular chamber dilation and contractile dysfunction.EtiologyVarious factors can cause DCM, including hypertension and heavy alcohol intake, which contribute to the weakening and enlargement of the heart muscle. Viral infections, such as Coxsackievirus B, adenoviruses, and influenza, can lead to DCM by causing inflammation and damage to heart tissue. Certain chemotherapeutic agents, including daunorubicin,...
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Cardiac mTOR complex 2 preserves ventricular function in pressure-overload hypertrophy.

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Mammalian target of rapamycin complex 2 (mTORC2) is crucial for maintaining heart function under pressure overload. Its deficiency impairs contractile performance, highlighting mTORC2

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Area of Science:

  • Cardiovascular Biology
  • Cellular Metabolism
  • Molecular Cardiology

Background:

  • Mammalian target of rapamycin (mTOR) regulates growth and metabolism.
  • mTOR exists in two complexes, mTORC1 and mTORC2, with distinct tissue-specific functions.
  • Previous work established mTORC1's role in cardiac hypertrophy and function.

Purpose of the Study:

  • To investigate the specific functions of mTOR complex 2 (mTORC2) within the heart.
  • To determine mTORC2's role in cardiac adaptation and response to stress.

Main Methods:

  • Generated mice with cardiomyocyte-specific deletion of rictor, a key mTORC2 component.
  • Utilized tamoxifen-inducible gene deletion for temporal control.
  • Assessed cardiac function and structure under basal and pressure-overload conditions (transverse aortic constriction).

Main Results:

  • Cardiac rictor deficiency did not impact basal cardiac growth or function.
  • Pressure overload induced cardiac dysfunction in rictor-deficient hearts.
  • Rictor ablation prevented adaptive increases in cardiac weight and cardiomyocyte size.
  • Changes in protein kinase C (PKC) isoforms (PKCε, PKCβII, PKCδ) were observed, linked to contractile dysfunction.

Conclusions:

  • mTORC2 plays a critical role in maintaining cardiac contractile function during pressure overload.
  • The study implicates reduced PKCε and altered PKCβII/PKCδ levels in mTORC2-dependent cardiac dysfunction.