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Related Experiment Video

Updated: May 24, 2026

Analysis of Cell Differentiation, Morphogenesis, and Patterning During Chicken Embryogenesis Using the Soaked-Bead Assay

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Published on: January 12, 2022

Tight junctions and differentiation--a chicken or the egg question?

Nina Kirschner¹, Rita Rosenthal, Dorothee Günzel

¹Department of Dermatology and Venerology, University Hospital Hamburg-Eppendorf, Germany Institute of Clinical Physiology, Charité, Campus Benjamin Franklin, Berlin, Germany.

Experimental Dermatology

|March 3, 2012

Summary

Skin barrier function relies on keratinocyte differentiation and tight junctions (TJs). This study explores how TJs and differentiation influence each other, proposing complex interactions rather than a simple cause-and-effect relationship.

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Last Updated: May 24, 2026

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Published on: January 12, 2022

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Area of Science:

Dermatology
Cell Biology
Biochemistry

Background:

The skin barrier prevents water loss and protects against external threats.
Keratinocytes differentiate to form the stratum corneum, crucial for barrier function.
Tight junctions (TJs) in the stratum granulosum are vital for skin barrier integrity.

Purpose of the Study:

To investigate the complex interplay between tight junctions (TJs) and keratinocyte differentiation in skin barrier formation.
To challenge the notion that altered TJs in skin diseases are solely a consequence of altered differentiation.
To propose hypotheses on the bidirectional relationship between TJs/TJ proteins and keratinocyte differentiation.

Main Methods:

This is a viewpoint article, presenting hypotheses and discussing existing literature.
Analysis of the roles of TJs and differentiation in skin barrier function.
Exploration of potential mechanisms governing their interaction within the skin microenvironment.

Main Results:

Altered TJ protein levels and distribution are observed in skin diseases like psoriasis, ichthyosis, and atopic dermatitis.
The relationship between TJs and differentiation is complex and microenvironment-dependent.
Three hypotheses are proposed: TJs influenced by differentiation, differentiation influenced by TJs, or independence.

Conclusions:

The interplay between TJs and keratinocyte differentiation is not a simple one-way street.
Both processes can influence each other, and their relationship is context-dependent.
Simultaneous influence, where one affects the other while also being affected, is a key concept.