Related Experiment Video

Updated: May 23, 2026

Mouse Electroacupuncture Fixation Device Fabrication for Electroacupuncture Pretreatment in Diabetic Cardiomyopathy Mouse Model
05:58

Mouse Electroacupuncture Fixation Device Fabrication for Electroacupuncture Pretreatment in Diabetic Cardiomyopathy Mouse Model

Published on: April 18, 2025

Autophagic predisposition in the insulin resistant diabetic heart

Kimberley M Mellor1, Melissa E Reichelt, Lea M D Delbridge

  • 1Department of Physiology, University of Melbourne, Melbourne, Victoria, Australia.

Life Sciences
|April 25, 2012
PubMed

Insights

Diabetic hearts experience cell loss through autophagy, a programmed cell death mechanism. Chronic, excessive autophagy in insulin-resistant hearts contributes to cardiomyocyte attrition and diabetic cardiomyopathy.

Area of Science:

  • Cardiology
  • Cell Biology
  • Metabolic Diseases

Background:

  • Diabetic cardiomyopathy is characterized by cardiac dysfunction independent of vascular issues.
  • Myocardial fibrosis and cardiomyocyte loss are hallmarks of diabetic heart disease.
  • Autophagy, a cellular degradation process, plays a complex role in stress response.

Purpose of the Study:

  • To investigate the role of autophagy in cardiomyocyte loss in diabetic cardiomyopathy.
  • To explore the mechanisms linking insulin resistance to excessive autophagic activity.

Main Methods:

  • Review of existing literature on diabetic cardiomyopathy and autophagy.
  • Analysis of cellular signaling pathways involved in insulin resistance and autophagy.
  • Examination of evidence for autophagic upregulation in the diabetic myocardium.

Main Results:

  • Diabetic hearts exhibit characteristics favoring pro-autophagic states, including PI3K/Akt pathway suppression.
  • Oxidative stress and metabolic dysregulation in insulin resistance promote autophagic activity.
  • Evidence suggests a link between upregulated autophagy and cardiomyocyte attrition in diabetic hearts.

Conclusions:

  • Excessive autophagy, driven by insulin resistance, is a key mechanism of cardiomyocyte loss in diabetic cardiomyopathy.
  • Targeting autophagy may offer a therapeutic strategy for diabetic heart disease.

More Related Videos

Modeling and Evaluation of Murine Diabetic Cardiomyopathy Model06:22

Modeling and Evaluation of Murine Diabetic Cardiomyopathy Model

Published on: November 29, 2024

Combined Intravital Microscopy and Contrast-enhanced Ultrasonography of the Mouse Hindlimb to Study Insulin-induced Vasodilation and Muscle Perfusion08:22

Combined Intravital Microscopy and Contrast-enhanced Ultrasonography of the Mouse Hindlimb to Study Insulin-induced Vasodilation and Muscle Perfusion

Published on: March 20, 2017

Related Concept Videos

Type II Diabetes II: Pathophysiology01:24

Type II Diabetes II: Pathophysiology

PathophysiologyType 2 diabetes mellitus (T2DM ) is a chronic metabolic disorder characterized by insulin resistance and progressive pancreatic β-cell dysfunction, leading to impaired glucose homeostasis. It results from interactions among genetic predisposition, environmental factors, and metabolic stressors, such as overnutrition and a sedentary lifestyle.Insulin Resistance and Glucose DysregulationEarly T2DM involves insulin resistance in skeletal muscle, adipose tissue, and the liver.
Type II Diabetes I: Introduction01:26

Type II Diabetes I: Introduction

Type 2 diabetes mellitus (T2DM) is a chronic metabolic disorder characterized by insulin resistance, in which target tissues such as the liver, muscle, and adipose tissue respond poorly to insulin. It is also associated with inadequate compensatory insulin secretion, where pancreatic β-cells fail to produce sufficient insulin. Together, these abnormalities lead to persistent hyperglycemia.EtiologyT2DM develops through a complex interaction of genetic predisposition and environmental or...
Type I Diabetes II: Pathophysiology01:26

Type I Diabetes II: Pathophysiology

Type 1 diabetes mellitus arises from an immune-mediated destruction of pancreatic β-cells, resulting in an absolute deficiency of insulin. This process develops in genetically susceptible individuals when autoimmunity, environmental exposures, and immunologic dysregulation converge to trigger a targeted attack on the insulin-producing cells of the pancreas. The β-cells are located within the islets of Langerhans and are essential for regulating blood glucose by facilitating cellular uptake of...
Insulin: The Receptor and Signaling Pathways01:28

Insulin: The Receptor and Signaling Pathways

Insulin action is mediated through a receptor tyrosine kinase, akin to the IGF-1 receptor. The number of receptors per cell varies significantly, from 40 on erythrocytes to 300,000 on adipocytes and hepatocytes. The insulin receptor consists of linked α/β subunit dimers, forming a heterotetramer glycoprotein with two extracellular α subunits and two β subunits spanning the membrane. The α subunits inhibit the inherent tyrosine kinase activity of the β subunits, but this inhibition is released...
Pathophysiology of Diabetes01:20

Pathophysiology of Diabetes

Diabetes mellitus is a chronic metabolic disorder characterized by hyperglycemia. The four categories of diabetes are type 1 diabetes, type 2 diabetes, other specific types of diabetes, and gestational diabetes.
Type 1 diabetes is characterized by autoimmune-mediated destruction of pancreatic β cells, with environmental factors potentially triggering this process in genetically susceptible individuals. Despite many not having a family history, certain genes increase susceptibility, suggesting a...
Autophagy01:27

Autophagy

Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...