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Related Concept Videos

Cardiomyopathy III: Hypertrophic Cardiomyopathy01:29

Cardiomyopathy III: Hypertrophic Cardiomyopathy

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...
Heart Failure II: Pathophysiology01:29

Heart Failure II: Pathophysiology

Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...
Imbalances in Cardiac Output01:26

Imbalances in Cardiac Output

The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send blood...
Cardiomyopathy II: Dilated Cardiomyopathy01:30

Cardiomyopathy II: Dilated Cardiomyopathy

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,...
Structure of Cardiac Muscles01:13

Structure of Cardiac Muscles

Cardiac muscle, or myocardium, is a specialized type of muscle found exclusively in the heart. Its unique structural and functional characteristics enable the heart to perform its vital role of pumping blood throughout the body continuously and rhythmically. The cardiac muscle cells, or cardiomyocytes, possess an endomysium and perimysium but do not have an epimysium.
Compared to skeletal muscles, cardiac muscle cells are small and mostly have a single nucleus. Additionally, they are usually...
Pathophysiology of Heart Failure01:17

Pathophysiology of Heart Failure

Heart failure (HF) is a progressive syndrome involving ventricles that leads to inadequate cardiac output. It can be classified based on location and output or ejection fraction. Ejection fraction (EF) is an essential measurement in the diagnosis and surveillance of HF. Reduced EF corresponds to systolic heart failure (HFrEF). However, HF with preserved ejection fraction (HFpEF) is becoming increasingly prevalent. Also known as diastolic HF, this form of HF is related to aging. The...

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Related Experiment Video

Updated: Jul 2, 2026

Scanning Electron Microscopy of Macerated Tissue to Visualize the Extracellular Matrix
10:21

Scanning Electron Microscopy of Macerated Tissue to Visualize the Extracellular Matrix

Published on: June 14, 2016

Hearts lacking caveolin-1 develop hypertrophy with normal cardiac substrate metabolism.

Ayanna S Augustus1, Jonathan Buchanan, Ellen Gutman

  • 1Department of Cancer Biology, Thomas Jefferson University, Philadelphia, Pennsylvania 19107, USA.

Cell Cycle (Georgetown, Tex.)
|August 23, 2008
PubMed
Summary

Loss of caveolin-1 (Cav1) in mice causes cardiac hypertrophy and dysfunction. Despite increased fatty acid uptake, Cav1-deficient hearts maintain normal energy metabolism and gene expression, revealing a unique hypertrophy model.

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A Model of Cardiac Remodeling Through Constriction of the Abdominal Aorta in Rats
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Last Updated: Jul 2, 2026

Scanning Electron Microscopy of Macerated Tissue to Visualize the Extracellular Matrix
10:21

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Published on: June 14, 2016

A Model of Cardiac Remodeling Through Constriction of the Abdominal Aorta in Rats
07:31

A Model of Cardiac Remodeling Through Constriction of the Abdominal Aorta in Rats

Published on: December 2, 2016

Area of Science:

  • Cardiovascular Biology
  • Molecular Metabolism
  • Cell Biology

Background:

  • The adult heart primarily uses long-chain fatty acids (FA) for energy.
  • Pathological cardiac hypertrophy shifts heart metabolism towards glucose utilization.
  • Caveolin-1 (Cav1) is crucial for cellular structure and interacts with metabolic proteins.

Purpose of the Study:

  • To investigate the metabolic phenotype of cardiac fibroblasts lacking caveolin-1 (Cav1ko).
  • To understand the role of Cav1 in cardiac substrate utilization and hypertrophy development.

Main Methods:

  • Generation and analysis of Cav1 gene-ablated (Cav1ko) mice.
  • Assessment of cardiac function, substrate uptake, and oxidation in isolated perfused hearts.
  • Gene expression analysis using Real-time PCR and microarray.

Main Results:

  • Cav1ko hearts exhibited cardiac hypertrophy and contractile dysfunction.
  • Increased uptake of Intralipid and albumin-bound FA in Cav1ko hearts.
  • No significant changes in glucose oxidation or glycolysis, but a trend towards increased FA oxidation.
  • Reduced myocardial triglyceride, fatty acid, and cholesterol levels.
  • Altered expression of genes involved in calcium and lipid transport.

Conclusions:

  • Targeted loss of Cav1 induces a unique cardiac hypertrophy model.
  • Cav1 deficiency leads to altered substrate uptake and lipid content without changing major energy metabolism gene expression.
  • This model provides insights into cardiac metabolic adaptations during hypertrophy.