Role of nitric oxide in regulating epidermal permeability barrier function

Area of Science:

• Dermatology
• Molecular Biology
• Cellular Physiology

Background:

• Nitric oxide (NO) is a signaling molecule synthesized by nitric oxide synthases (NOS).
• NOS, including endothelial NOS (eNOS), inducible NOS (iNOS), and neural NOS (nNOS), are present in keratinocytes.
• NO regulates various cellular functions, and its dysregulation is linked to disorders like diabetes and hypertension.

Purpose of the Study:

• To review the regulatory role of NO in epidermal permeability barrier functions.
• To summarize the underlying mechanisms of NO's action in skin.
• To highlight the importance of physiological NO levels for keratinocyte function.

Main Methods:

• Literature review of studies on nitric oxide and skin physiology.
• Analysis of the roles of different NOS isoforms in keratinocytes.
• Examination of NO's effects on keratinocyte proliferation, differentiation, and lipid metabolism.

Main Results:

• Physiological NO levels are essential for normal keratinocyte function and epidermal barrier homeostasis.
• NO influences wound healing and epidermal permeability barrier recovery.
• While NO donors can impact barrier recovery, iNOS remains crucial for homeostasis.

Conclusions:

• Nitric oxide plays a critical role in maintaining skin barrier integrity and facilitating wound repair.
• Understanding NO's mechanisms in keratinocytes is key to addressing skin disorders.
• Maintaining balanced NO levels is essential for optimal skin health.