The systemic influence of chronic smoking on skin structure and mechanical function

Area of Science:

• Dermatology
• Pathology
• Biomaterials Science

Background:

• Human skin provides environmental protection, but factors like smoking impair its function.
• Smoking is linked to facial wrinkles and reduced skin function, with known systemic effects on respiratory and cardiovascular systems.
• Elastic fibers are crucial in lung pathology associated with smoking.

Purpose of the Study:

• To investigate the systemic effects of chronic smoking on the skin's elastic fiber system.
• To analyze nanostructural and mechanical changes in microfibrils and the micromechanical stiffness of skin layers.
• To compare these changes in chronic smokers versus age- and sex-matched non-smokers.

Main Methods:

• Histological examination of cutaneous elastic fiber system in photoprotected skin.
• Analysis of fibrillin-rich microfibril nanostructure and mechanics.
• Scanning acoustic microscopy to assess dermal and epidermal stiffness.
• In situ zymography to evaluate gelatinase activity.

Main Results:

• Chronic smokers showed significant remodeling of elastic fiber networks (elastin and microfibrils) in photoprotected skin.
• No increase in gelatinase activity was observed.
• Ultrastructural changes were found in extracted fibrillin-rich microfibrils.
• Dermal and epidermal stiffness significantly increased in chronic smokers.

Conclusions:

• Chronic smoking has unappreciated systemic effects on the cutaneous elastic fiber network.
• These changes may contribute to smoking-induced skin wrinkling and loss of elasticity.
• Smoking-induced alterations in skin structure and mechanics are significant.