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Diabetic Neuropathy

Diabetic Neuropathy

DefinitionDiabetic neuropathy is nerve damage caused by long-standing diabetes mellitus. It results directly from prolonged high blood sugar levels.PathophysiologyThe pathophysiology of diabetic neuropathy involves both metabolic and vascular disturbances triggered by chronic hyperglycemia.Metabolic injury: Elevated glucose levels activate the polyol pathway within nerve cells, leading to the accumulation of sorbitol and fructose. This increases oxidative stress, disrupts normal nerve...

Type II Diabetes II: Pathophysiology

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 I Diabetes II: Pathophysiology

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...

Diabetic Ketoacidosis ll: Pathophysiology

Diabetic Ketoacidosis ll: Pathophysiology

Diabetic ketoacidosis (DKA) is a metabolic emergency characterized by hyperglycemia, ketonemia, and metabolic acidosis. It results from severe insulin deficiency and an excess of counterregulatory hormones, leading to uncontrolled lipolysis, ketogenesis, and widespread electrolyte and fluid disturbances.Pathophysiology The central event in DKA is a profound loss of insulin action. Without insulin, glucose uptake in insulin-dependent tissues is impaired, while hepatic glucose production...

Diabetes Mellitus: Overview and Type I Subtype

Diabetes Mellitus: Overview and Type I Subtype

Diabetes mellitus is a chronic metabolic disorder characterized by high blood glucose levels due to inadequate insulin production, insulin resistance, or both. The condition affects millions worldwide and can significantly impact their health and quality of life.
Type 1 diabetes is an autoimmune disease in which the immune system mistakenly attacks and destroys the insulin-producing beta cells in the pancreas. As a result, the body is unable to produce sufficient insulin, and individuals with...

Overview of Carbohydrate Metabolism

Overview of Carbohydrate Metabolism

Carbohydrate metabolism is a fundamental biochemical process that ensures a constant supply of energy to living cells. The most important carbohydrate is glucose, which can be broken down via glycolysis to enter into the Krebs cycle and eventually lead to the production of ATP through oxidative phosphorylation.
Glucose transport into cells is facilitated by a family of transport proteins called GLUT (Glucose Transporters). GLUT4 is the primary glucose transporter for insulin-stimulated glucose...

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Related Experiment Video

Updated: May 17, 2026

Phosphorus-31 Magnetic Resonance Spectroscopy: A Tool for Measuring In Vivo Mitochondrial Oxidative Phosphorylation Capacity in Human Skeletal Muscle

Phosphorus-31 Magnetic Resonance Spectroscopy: A Tool for Measuring In Vivo Mitochondrial Oxidative Phosphorylation Capacity in Human Skeletal Muscle

Published on: January 19, 2017

[Metabolic neuropathies: overview in 2011].

J Franques¹, A Verschueren

¹Centre de référence des maladies neuromusculaires et de la SLA, hôpital de La Timone, AP-HM, 264 rue Saint-Pierre, Marseille cedex 05, France. p078624@ap-hm.fr

Revue Neurologique

|October 31, 2012

Summary

Metabolic diseases frequently cause nerve damage. Recent research highlights diabetic neuropathy, vitamin B12 deficiency, and skin biopsy for diagnosing nerve fiber density in metabolic disorders.

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Last Updated: May 17, 2026

Phosphorus-31 Magnetic Resonance Spectroscopy: A Tool for Measuring In Vivo Mitochondrial Oxidative Phosphorylation Capacity in Human Skeletal Muscle

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Three-dimensional Imaging and Analysis of Mitochondria within Human Intraepidermal Nerve Fibers

Three-dimensional Imaging and Analysis of Mitochondria within Human Intraepidermal Nerve Fibers

Published on: September 29, 2017

Area of Science:

Neurology
Metabolic Medicine
Pathology

Context:

Metabolic diseases are a common cause of axonal and small-fiber neuropathies.
Diabetic neuropathy receives significant research attention due to its high prevalence.
Vitamin B12 deficiency is gaining renewed interest because its biological markers can be unreliable.

Purpose:

To review the role of metabolic diseases in neuropathy.
To highlight the diagnostic challenges of vitamin B12 deficiency.
To discuss the utility of intra-epidermic nerve fiber density measurements.

Summary:

Metabolic diseases frequently cause nerve damage, with diabetic neuropathy being extensively studied.
Vitamin B12 deficiency is increasingly recognized, despite limitations in current diagnostic markers.
Intra-epidermic nerve fiber density measured via skin biopsy shows promise for diagnosing neuropathies in conditions like hypothyroidism, renal failure, and Fabry disease.

Impact:

Improved understanding of neuropathy causes and diagnosis.
Potential for earlier diagnosis and treatment of metabolic neuropathies.
Highlights the value of skin biopsy in diagnosing subclinical metabolic disorders affecting nerves.