Desmosome
Desmosome — a specialized cell-to-cell junction that anchors adjacent skin cells together, providing mechanical strength to the epidermis. In the outer skin layer these structures become corneodesmosomes, acting like rivets that hold corneocytes in place until enzymes break them down during natural shedding.
Key points
- Desmosomes link neighboring keratinocytes and connect to the internal keratin filament network, distributing mechanical stress across the tissue.
- In the stratum corneum they are modified into corneodesmosomes, the main adhesive structures between corneocytes.
- Enzymes such as kallikreins gradually degrade corneodesmosomes to allow orderly desquamation of the skin surface.
- Disruption of desmosomal proteins can weaken skin cohesion and is seen in certain blistering and scaling skin conditions.
- Balanced desmosome breakdown is essential for smooth, even shedding rather than visible flaking.
Frequently asked
How is a desmosome different from a tight junction?
A desmosome provides mechanical adhesion and strength between cells, while a tight junction seals the space between cells to control what passes through; the two serve complementary barrier roles.
Do desmosomes affect exfoliation?
Yes, because corneodesmosomes must be enzymatically broken down for skin cells to shed, and factors like low hydration or high pH can slow this process and lead to buildup.
Related topics
This is a foundational entry in the SYNC Skin Encyclopedia and is expanded over time. Educational information only — not medical advice.
