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Related Concept Videos

Myocarditis I: Introduction01:21

Myocarditis I: Introduction

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Myocarditis is inflammation of the myocardium, which is the muscular layer of the heart.EtiologyMyocarditis has a diverse etiology, including a wide range of infectious and non-infectious causes:Infectious CausesViral: Common viruses include Coxsackie A and B, adenovirus, parvovirus B19, enteroviruses, and influenza A.Bacterial: Examples include infections caused by Streptococcus, Staphylococcus, and Mycoplasma species.Rickettsial: Infections like Rocky Mountain spotted fever can result in...
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Cardiomyopathy III: Hypertrophic Cardiomyopathy01:29

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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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Cardiomyopathy II: Dilated Cardiomyopathy01:30

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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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Rheumatic Heart Disease I: Introduction01:23

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Rheumatic heart disease or RHD is a chronic condition that results from rheumatic fever, causing permanent damage to the heart valves.Etiology and Risk FactorsIt primarily arises from rheumatic fever, an inflammatory disease that can develop after untreated or inadequately treated group A streptococcal (GAS) pharyngitis. Streptococcus spreads through direct contact with oral or respiratory secretions. While the bacteria are the causative agents, factors like malnutrition, overcrowding, poor...
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Cardiomyopathy IV: Restrictive Cardiomyopathy01:29

Cardiomyopathy IV: Restrictive Cardiomyopathy

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Restrictive cardiomyopathy (RCM) is a rare heart muscle disease characterized by impaired ventricular filling due to stiffened ventricular walls, leading to significant diastolic dysfunction.EtiologyRestrictive cardiomyopathy can arise from both inherited and acquired diseases, many of which are systemic. It is categorized into four main types: infiltrative, storage, non-infiltrative, and endomyocardial diseases.Infiltrative diseases, such as amyloidosis, lead to RCM by depositing amyloid...
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Cardiomyopathy I: Introduction and Classification01:25

Cardiomyopathy I: Introduction and Classification

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Cardiomyopathy, or CMP, is a group of diseases affecting the myocardial structure, impairing its ability to pump blood effectively. This condition can lead to arrhythmias, heart failure, or sudden cardiac death.Cardiomyopathies are classified into primary and secondary categories:Primary Cardiomyopathy refers to conditions involving only the heart muscle that are often idiopathic (of unknown cause) or genetic. They primarily affect the myocardium without the involvement of other systemic...
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Area of Science:

  • Cardiovascular Biology
  • Molecular Medicine
  • Fibrosis Research

Background:

  • Cardiac fibrosis is a hallmark of heart disease and a therapeutic target.
  • Interleukin 11 (IL11) has conflicting roles, with some studies suggesting cardioprotective effects and others implicating it in fibrosis via transforming growth factor β (TGFβ).

Purpose of the Study:

  • To investigate the specific effects of cardiomyocyte-derived interleukin 11 (IL11) on cardiac pathobiology and function in vivo.
  • To challenge previous reports on the cardioprotective potential of IL11.

Main Methods:

  • Generated a tamoxifen-inducible mouse model with cardiomyocyte-restricted murine *Il11* expression using the Cre-loxP system.
  • Analyzed cardiac fibrosis, inflammation, and function using protein assays, bulk RNA-sequencing, and in vivo imaging.
  • Investigated the impact of IL11 on endothelial-to-mesenchymal transition.

Main Results:

  • Transforming growth factor β (TGFβ) stimulation of cardiomyocytes upregulated *Il11* expression.
  • Hearts with cardiomyocyte-specific IL11 expression exhibited severe cardiac fibrosis and inflammation.
  • Elevated IL11 levels correlated with increased cytokines, chemokines, complement factors, inflammatory cells, and endothelial-to-mesenchymal transition, leading to left ventricular dysfunction.

Conclusions:

  • Species-matched IL11 secreted by cardiomyocytes is a potent profibrotic and proinflammatory factor in the heart.
  • These findings establish IL11 as a significant contributor to cardiac disease pathology, challenging its previously suggested cardioprotective roles.