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Related Concept Videos

Skin Diseases and Disorders01:23

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...
Staphylococcal Skin Infections01:29

Staphylococcal Skin Infections

Staphylococcus aureus is a Gram-positive coccus that resides harmlessly on the skin and mucous membranes of healthy individuals. When the skin barrier is breached, it can shift from a commensal to an opportunistic pathogen. This transition is facilitated by surface adhesins, such as clumping factor B and S. aureus surface protein G (SasG), which bind to structural proteins, including loricrin and cytokeratin, in the damaged epidermis. Protein A, another key factor, binds the Fc region of...
Skin Cancer01:30

Skin Cancer

Skin cancer is a type of cancer that occurs when there is an abnormal growth of skin cells, usually triggered by damage to the DNA within the skin cells. It is primarily caused by exposure to ultraviolet (UV) radiation from the sun or artificial sources like tanning beds. Skin cancer is the most common type of cancer worldwide, and its incidence continues to rise.
Basal Cell Carcinoma (BCC): BCC is the most common type of skin cancer, accounting for about 80% of cases. It typically develops in...
Cystic Fibrosis: Pathogenesis01:23

Cystic Fibrosis: Pathogenesis

Cystic fibrosis (CF), an autosomal recessive disorder, significantly affects the function of exocrine glands. This genetically inherited disease is characterized by the production of thick and sticky mucus, which can severely affect various organs and systems in the body.
CF is primarily caused by a genetic mutation in a chromosome 7 gene coding for the cystic fibrosis transmembrane conductance regulator (CFTR) protein. The most common gene mutation leading to CF is the ΔF508 mutation, but...
The JAK-STAT Signaling Pathway01:20

The JAK-STAT Signaling Pathway

Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as  SH2...
Pulmonary Tuberculosis II01:28

Pulmonary Tuberculosis II

Tuberculosis, or TB, is a bacterial infectious disease caused by Mycobacterium tuberculosis. While its primary impact is on the lungs, leading to pulmonary tuberculosis, it can also affect various other organs, a condition referred to as extrapulmonary tuberculosis.
Here is a detailed explanation of its pathophysiology:
Transmission: The process begins when a person inhales droplet nuclei containing M. tuberculosis. These are typically released into the air when an individual with pulmonary or...

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Related Experiment Video

Updated: Jun 17, 2026

Primary Sjogren's Syndrome Associated with Lung Adenocarcinoma: Probing the Potential Common Pathogenic Mechanisms and Experimental Verification
10:21

Primary Sjogren's Syndrome Associated with Lung Adenocarcinoma: Probing the Potential Common Pathogenic Mechanisms and Experimental Verification

Published on: September 20, 2024

Cutaneous sarcoidosis: updates in the pathogenesis.

M M Ali1, A A Atwan, M L Gonzalez

  • 1Department of Dermatology, School of Medicine, Cardiff University, Cardiff, UK. mohammadalim@cardiff.ac.uk

Journal of the European Academy of Dermatology and Venereology : JEADV
|December 18, 2009
PubMed
Summary

Sarcoidosis pathogenesis involves genetic susceptibility and environmental factors triggering a T-helper-1 immune response. Research on cutaneous sarcoidosis is limited, despite skin involvement in a third of patients.

Related Experiment Videos

Last Updated: Jun 17, 2026

Primary Sjogren's Syndrome Associated with Lung Adenocarcinoma: Probing the Potential Common Pathogenic Mechanisms and Experimental Verification
10:21

Primary Sjogren's Syndrome Associated with Lung Adenocarcinoma: Probing the Potential Common Pathogenic Mechanisms and Experimental Verification

Published on: September 20, 2024

Area of Science:

  • Immunology
  • Genetics
  • Dermatology

Background:

  • Sarcoidosis is a multisystem granulomatous disease with frequent skin manifestations.
  • Cutaneous sarcoidosis affects one-third of patients and presents with diverse clinical features.
  • The etiology of sarcoidosis remains largely unknown despite extensive research.

Purpose of the Study:

  • To provide a comprehensive overview of current updates in sarcoidosis pathogenesis.
  • To highlight recent insights into the genetic and environmental factors influencing sarcoidosis.
  • To address the limited research on cutaneous sarcoidosis.

Main Methods:

  • Literature review of recent studies on sarcoidosis pathogenesis.
  • Analysis of genetic polymorphisms associated with sarcoidosis risk.
  • Evaluation of evidence for infectious etiologies and immune responses.

Main Results:

  • Genetic polymorphisms suggest polygenic susceptibility to sarcoidosis.
  • Environmental factors and potential infectious agents may modify disease risk.
  • Current understanding points to a T-helper-1 immune response in genetically susceptible individuals.

Conclusions:

  • Sarcoidosis pathogenesis is complex, involving genetic predisposition and environmental triggers.
  • Further research is needed, particularly on the pathogenesis of cutaneous sarcoidosis.
  • Despite advances, a significant knowledge gap persists in understanding sarcoidosis.