Related Experiment Video

Updated: Jun 6, 2026

Evaluation of Caspase Activation to Assess Innate Immune Cell Death
10:23

Evaluation of Caspase Activation to Assess Innate Immune Cell Death

Published on: January 20, 2023

Development of atopic dermatitis-like skin disease from the chronic loss of epidermal caspase-8

Christopher Li1, Samuel Lasse, Pedro Lee

  • 1Division of Biological Sciences, Section of Cell and Developmental Biology, School of Medicine, University of California at San Diego, La Jolla, CA 92093, USA.

Proceedings of the National Academy of Sciences of the United States of America
|December 8, 2010
PubMed

Insights

Chronic loss of epidermal caspase-8 mimics atopic dermatitis, revealing matrix metalloproteinase-2

Area of Science:

  • Dermatology
  • Molecular Biology
  • Cell Biology

Background:

  • Atopic dermatitis affects 20% of children globally, compromising skin barrier function.
  • Its complex etiology involves disrupted epidermal barrier and increased infection susceptibility.
  • Chronic loss of epidermal caspase-8 (a key protein) recapitulates atopic dermatitis features.

Purpose of the Study:

  • To investigate the role of epidermal caspase-8 in atopic dermatitis pathogenesis.
  • To elucidate the molecular mechanisms underlying spongiosis in atopic dermatitis.
  • To explore the connection between wound-healing processes and inflammatory skin diseases.

Main Methods:

  • Utilized a mouse model with chronic loss of epidermal caspase-8.
  • Analyzed epidermal structure, intercellular adhesion, and tissue architecture.
  • Investigated the role of matrix metalloproteinase-2 (MMP-2) and p38 MAPK signaling.

Main Results:

  • Chronic epidermal caspase-8 loss induced spongiosis, characterized by disrupted keratinocyte adhesion.
  • Suppression of MMP-2 activity abrogated spongiosis, independent of edema.
  • p38 MAPK signaling was found to induce MMP-2, leading to E-cadherin cleavage and impaired keratinocyte cohesion.

Conclusions:

  • Epidermal caspase-8 deficiency drives atopic dermatitis-like skin inflammation.
  • MMP-2 activity, regulated by p38 MAPK, is crucial for spongiosis in this model.
  • Understanding these pathways offers insights into treating inflammatory skin conditions by targeting wound-healing mechanisms.

Related Concept Videos

Caspases01:24

Caspases

Caspase, a family of cysteine proteases, serve as effectors in apoptosis. The ced3 gene in C.elegans was first identified to be involved in apoptosis. This gene encodes the ced-3 caspase that is similar to the interleukin-1-beta converting enzyme or ICE in mammals. In addition to apoptosis, caspases also function in the inflammatory response. Inflammatory caspases are essential in activating pro-inflammatory cytokines that recruit immune cells and block the replication of pathogens inside cells.
Cellular Injury V: Apoptosis and Autophagy01:22

Cellular Injury V: Apoptosis and Autophagy

Cells respond to damage and stress through highly coordinated processes that decide whether they survive or undergo controlled self-destruction. Two major pathways involved in this regulation are apoptosis, a type of programmed cell death, and autophagy, a survival mechanism that helps cells adapt to adverse conditions.ApoptosisApoptosis removes aged or injured cells to maintain tissue balance. During this process, the cell shrinks, chromatin condenses and fragments, and membrane-bound...
Clinical Applications of Epidermal Stem Cells01:19

Clinical Applications of Epidermal Stem Cells

Epidermal stem cells (EpiSCs) are mainly located at the basal layer of the epidermis. These cells repair minor injuries of the skin and replace dead skin cells. However, EpiSCs’ cannot heal severe wounds such as major burns or those from diabetes or hereditary disorders. In such cases, culturing the epidermal stem cells from the patient is possible and has yielded successful treatment options, such as laboratory-grown skin grafts. These grafts are synthesized using a patient’s own EpiSCs...
Inflammatory Bowel Disease III: Crohn's Disease01:25

Inflammatory Bowel Disease III: Crohn's Disease

Crohn’s disease is a chronic, relapsing form of inflammatory bowel disease characterized by segmental, transmural inflammation that can affect any part of the gastrointestinal tract. Its pathogenesis arises from a combination of genetic susceptibility, environmental exposures, epithelial barrier dysfunction, and immune dysregulation. Together, these factors lead to an exaggerated immune response against components of the gut microbiome.Genetic and Environmental InfluencesMultiple genetic...
Renewal of Skin Epidermal Stem Cells01:12

Renewal of Skin Epidermal Stem Cells

The skin is divided into epidermis, dermis, and hypodermis, the skin's outermost, middle, and inner layers. The human epidermal layer regularly undergoes renewal, where old, dead cells are replaced by new cells. Epidermal stem cells or EpiSCs divide and differentiate to restore the lost cells. For the renewal process, some EpiSCs continuously self-renew. In contrast, few others differentiate into transit-amplifying cells, which later form prickle or spinous cells, followed by granular cells,...
The Extrinsic Apoptotic Pathway01:17

The Extrinsic Apoptotic Pathway

The extrinsic apoptotic pathway is initiated when extracellular death-inducing signals, such as specific cytokines, activate the death receptors expressed on the cell surface. The immune cells involved in this pathway are natural killer cells (NK cells) and cytotoxic T-lymphocytes. NK cells are critical in innate immune response, while cytotoxic T-lymphocytes are associated with adaptive immune response. These cells recognize specific receptors expressed on the altered cells and activate...