The keratinocyte in epidermal renewal and defence

Area of Science:

• Dermatology
• Cell Biology
• Immunology

Background:

• Keratinocytes were traditionally viewed as passive epidermal cells.
• Current understanding highlights keratinocytes as active participants in skin renewal and immune defense.
• Epidermal homeostasis relies on keratinocyte progenitor cell division and signaling networks.

Purpose of the Study:

• To review the regulatory signaling network governing keratinocyte functions.
• To describe how keratinocytes impact epidermal homeostasis.
• To explain the role of keratinocytes in inflammatory responses.

Main Methods:

• Review of current scientific literature on keratinocyte signaling.
• Analysis of paracrine and autocrine signaling circuits.
• Examination of keratinocyte responses to wounding and inflammation.

Main Results:

• Keratinocytes actively regulate epidermal renewal through complex signaling cascades.
• Wounding and inflammation alter keratinocyte behavior, impacting adhesion and receptor interactions.
• Keratinocytes secrete cytokines, chemokines, and antimicrobial peptides during inflammation.

Conclusions:

• Keratinocytes are crucial regulators of both skin homeostasis and inflammatory processes.
• Dysregulation of keratinocyte signaling can lead to chronic inflammatory skin conditions.
• Understanding these networks is key to addressing severe skin lesions.