Nitric oxide function in the skin.

Area of Science:

• Dermatology
• Molecular Biology
• Biochemistry

Background:

• Nitric oxide (NO) is a crucial signaling molecule with diverse biological functions.
• Recent research highlights NO's significant role in both normal skin physiology and pathophysiology.
• This review examines the literature on NO's function, clinical significance, and therapeutic potential in the skin.

Purpose of the Study:

• To review the current literature on the function of nitric oxide (NO) in normal skin.
• To discuss the clinical and pathological significance of NO in skin conditions.
• To explore potential therapeutic advances related to NO in dermatology.

Main Methods:

• Review of existing scientific literature on nitric oxide (NO) and skin biology.
• Analysis of the expression and function of different nitric oxide synthase (NOS) isoforms (NOS1, NOS2, NOS3) in various skin cells.
• Examination of NO's role in response to stimuli like UV radiation and skin wounding.

Main Results:

• Keratinocytes express NOS1, while fibroblasts and other skin cells express NOS3; NOS2 can be induced in virtually all skin cells under certain conditions.
• Constitutive NO production influences skin barrier function and microvascular blood flow.
• UV irradiation and skin wounding stimulate NO production, initiating processes like melanogenesis, erythema, immunosuppression, and inflammation, with NOS2 expression overlapping with constitutive NOS activation.

Conclusions:

• Nitric oxide (NO) is integral to skin's adaptability and function, regulating processes from barrier maintenance to wound healing.
• Different rates of NO production, involving NOS1, NOS2, and NOS3, are critical for orchestrating complex skin responses.
• Further understanding of NO pathways in the skin may lead to novel dermatological therapies.