Related Experiment Video
Updated: Aug 14, 2026

06:41
A New Technique for Quantitative Analysis of Hair Loss in Mice Using Grayscale Analysis
Published on: March 9, 2015
The pathogenesis of alopecia areata
1Department of Dermatology, Royal Hallamshire Hospital, United Kingdom.
Dermatologic Clinics
|October 1, 1996
Summary
Alopecia areata disease mechanisms are explored through advances in hair biology, immunology, and genetics. A new model suggests polygenic factors influence severity, with unknown triggers initiating hair loss.
Area of Science:
- Dermatology
- Immunology
- Genetics
- Hair Biology
Background:
- Alopecia areata is an autoimmune skin condition causing hair loss.
- Current understanding of its pathogenesis remains incomplete.
- Advances in related fields offer new insights.
Purpose of the Study:
- To discuss disease mechanisms of alopecia areata.
- To present a novel disease model.
- To highlight opportunities for novel therapies.
Main Methods:
- Review of current literature in hair biology, immunology, and genetics.
- Presentation of a conceptual disease model.
- Discussion of experimental systems, including animal models.
Main Results:
- A disease model integrating polygenic determination of severity and susceptibility.
- Identification of largely unknown trigger factors for clinical disease expression.
- Emerging experimental systems provide new avenues for research.
Conclusions:
- Progress in hair biology, immunology, and genetics enhances understanding of alopecia areata.
- The proposed model offers a framework for future research.
- Experimental systems, particularly animal models, are crucial for developing new alopecia areata therapies.
Related Concept Videos
Accessory Structures of the Skin: Hair Growth and Types
Hair growth begins with the production of keratinocytes by the basal cells of the hair bulb. As new cells are deposited at the hair bulb, the hair shaft is pushed through the follicle toward the surface. Keratinization is completed as the cells are pushed to the skin surface to form the shaft of hair that is externally visible. The external hair is completely dead and composed entirely of keratin. Hair can be cut or shaven without damaging the hair structure because the cut is superficial. Most...
Skin Diseases and Disorders
Skin is the first line of defense and encounters a variety of microbes. Some pathogenic strains are often the cause of a broad range of infections of the skin and other body systems. These conditions can affect people of all ages and may have different causes, including genetic factors, infections, autoimmune reactions, environmental factors, and lifestyle choices.
Gram-positive Staphylococcus spp. and Streptococcus spp. are responsible for many of the most common skin infections. However, many...
Gram-positive Staphylococcus spp. and Streptococcus spp. are responsible for many of the most common skin infections. However, many...
Autoimmune Disorders
Autoimmune diseases are a group of disorders in which the body's immune system mistakenly attacks its own cells, tissues, and organs. This results from an overactive immune response against substances and tissues normally present in the body. Let's delve into the concept and mechanism of autoimmune diseases from an immune system point of view, explore different causes and examples of such diseases, and discuss potential solutions.
Concept and Mechanism of Autoimmune Diseases
The immune system...
Concept and Mechanism of Autoimmune Diseases
The immune system...
Type I Diabetes I: Introduction
Type 1 diabetes mellitus is a chronic metabolic disorder characterized by an absolute deficiency of insulin resulting from the autoimmune destruction of pancreatic β-cells. Although it can occur at any age, it is most commonly diagnosed in childhood, adolescence, or early adulthood. The loss of insulin production impairs cellular glucose uptake, resulting in persistent hyperglycemia and necessitating lifelong insulin therapy.Autoimmune Destruction of β-CellsThe hallmark of type 1 diabetes is an...
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...
Alzheimer Disease ll: Pathophysiology
Alzheimer disease involves structural changes in the brain that begin long before symptoms appear. The most distinctive features are extracellular neuritic plaques and intracellular neurofibrillary tangles.Neuritic plaques form in the cerebral cortex and around blood vessels. These plaques contain a dense core of beta-amyloid (Aβ)—a toxic protein fragment that clumps outside neurons. The core is surrounded by damaged neuronal extensions, as well as reactive astrocytes and microglia. Abnormal...

