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Transglutaminases in skin epidermis.
1Department of Applied Molecular Biosciences, Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, Nagoya, 464-8601, Japan. hitomi@agr.nagoya-u.ac.jp
European Journal of Dermatology : EJD
|September 21, 2005
Summary
Transglutaminase (TGase) enzymes are crucial for skin barrier function by cross-linking proteins during keratinocyte differentiation. Dysregulation of TGase activity leads to irregular skin phenotypes, highlighting their importance.
Area of Science:
- Dermatology and biochemistry
- Cell biology and epidermal differentiation
Background:
- The skin's outermost layer, the cornified envelope (CE), is vital for barrier function.
- CE formation relies on covalent cross-linking of structural proteins like involucrin and loricrin.
- Transglutaminase (TGase) enzymes catalyze this essential protein cross-linking reaction.
Purpose of the Study:
- To review the expression, regulation, and function of specific TGases in skin epidermis.
- To highlight the role of TGases 1, 3, and 5 in CE formation.
- To underscore the consequences of TGase dysregulation on skin integrity.
Main Methods:
- Review of existing literature on TGase expression and function in keratinocytes.
- Analysis of the cooperative and sequential roles of TGases 1 and 3 in CE formation.
- Focus on TGase activation mechanisms, including limited proteolysis.
Main Results:
- TGases 1, 3, and 5 are key players in human skin CE formation.
- TGases 1 and 3 are activated by proteolysis during keratinocyte differentiation.
- These enzymes work together in a specific sequence to cross-link substrate proteins.
- Impaired TGase activity results in abnormal skin phenotypes.
Conclusions:
- TGase enzymes are essential for proper skin barrier formation and integrity.
- Understanding TGase regulation and function is critical for addressing skin disorders.
- Targeting TGase activity may offer therapeutic potential for certain dermatological conditions.