Mechanical stiffness across skin layers in human: a pilot study

Area of Science:

• Biophysics
• Dermatology
• Tissue Mechanics

Background:

• Mechanobiology is vital for skin homeostasis, wound healing, and regeneration.
• Altered tissue stiffness is associated with various skin pathologies.
• Understanding skin's physical properties is essential for diagnosing and treating skin conditions.

Purpose of the Study:

• To quantify the mechanical stiffness (elastic modulus) of different human skin layers.
• To establish a reference for the elastic modulus of various skin strata.
• To provide insights into the physical basis of skin physiology and pathology.

Main Methods:

• Atomic Force Microscopy (AFM) was employed to measure the elastic modulus.
• Analysis was performed on multiple skin layers from six participants (2 males, 4 females, aged 1-70 years).

Main Results:

• The elastic modulus of skin layers, from highest to lowest, was determined as: epidermis, papillary dermis, upper reticular dermis, lower reticular dermis, sebaceous gland, and subcutaneous tissue.
• Significant variations in mechanical stiffness exist across different skin strata.

Conclusions:

• This research establishes a quantitative hierarchy of mechanical stiffness for human skin layers.
• The findings offer valuable reference data for research in skin physiology and pathology.
• Understanding these biomechanical properties can aid in the development of new diagnostic and therapeutic strategies for skin diseases.