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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...
Type I Diabetes III: Clinical Manifestations01:19

Type I Diabetes III: Clinical Manifestations

Type 1 diabetes mellitus typically presents with rapid-onset symptoms due to the body’s inability to utilize glucose in the absence of insulin. Since insulin is required for glucose uptake into cells, its deficiency leads to hyperglycemia and cellular energy deprivation, resulting in characteristic clinical features.Polyuria and PolydipsiaOne of the earliest, most prominent symptoms is polyuria (excessive urination). When blood glucose concentrations rise above the renal threshold, the kidneys...
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...
Diabetes Mellitus: Introduction01:26

Diabetes Mellitus: Introduction

Diabetes mellitus consists of chronic metabolic disorders characterized by persistent hyperglycemia. This elevated blood glucose results from defects in insulin secretion, impaired insulin action, or both. Insulin, produced by pancreatic β-cells, is essential for maintaining glucose homeostasis by facilitating cellular glucose uptake for energy or storage. Disruptions in insulin production or function lead to glucose accumulation in the bloodstream, causing the clinical features and long-term...

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Related Experiment Video

Updated: Jul 15, 2026

Differentiated Mouse Adipocytes in Primary Culture: A Model of Insulin Resistance
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The insulin resistance syndrome: physiological considerations.

Sangeeta R Kashyap1, Ralph A Defronzo

  • 1Department of Endocrinology, Diabetes and Metabolism, Cleveland Clinic Foundation, Cleveland, OH 44195, USA. kashyas@ccf.org

Diabetes & Vascular Disease Research
|May 1, 2007
PubMed
Summary

Insulin resistance syndrome, or metabolic syndrome, involves cellular defects in insulin action and compensatory insulin secretion. This leads to conditions like type 2 diabetes, obesity, and cardiovascular disease.

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Area of Science:

  • Endocrinology
  • Metabolic Disorders
  • Cardiovascular Science

Background:

  • Insulin resistance syndrome (metabolic syndrome/syndrome X) is linked to impaired insulin action and increased insulin secretion.
  • This combination triggers metabolic and cardiovascular changes, often manifesting as type 2 diabetes, obesity, dyslipidemia, coronary artery disease, and hypertension.
  • Sleep disturbances (e.g., sleep apnea) and ovarian dysfunction are also associated with insulin resistance.

Purpose of the Study:

  • To elucidate the pathophysiology of insulin resistance syndrome.
  • To detail the molecular mechanisms underlying insulin resistance.
  • To connect insulin resistance to a spectrum of metabolic and cardiovascular conditions.

Main Methods:

  • Review of existing literature on insulin resistance and metabolic syndrome.
  • Analysis of molecular defects in insulin signaling pathways.
  • Examination of genetic and environmental factors contributing to the syndrome.

Main Results:

  • Insulin resistance involves defects in insulin receptor tyrosine kinase activity and post-receptor signaling.
  • Hyperinsulinemia resulting from insulin resistance contributes to various metabolic abnormalities.
  • The syndrome's development is influenced by a complex interplay of genetic and environmental factors.

Conclusions:

  • Insulin resistance is a central defect in metabolic syndrome, driving multiple comorbidities.
  • Molecular defects in insulin signaling are key to understanding the syndrome's development.
  • Addressing insulin resistance is crucial for managing associated metabolic and cardiovascular diseases.