Effect of high population density environment on skin barrier function in mice

Area of Science:

• Environmental Stress Physiology
• Dermatology
• Skin Biology

Background:

• Stressful stimuli significantly impact physiological conditions and homeostasis.
• Skin barrier function and water retention are crucial for maintaining skin health.
• Understanding the effects of environmental stressors on skin is important for public health.

Purpose of the Study:

• To investigate the influence of high population density (overcrowding) stress on mouse skin barrier function and water retention.
• To elucidate the underlying mechanisms of stress-induced dry skin.

Main Methods:

• Mice were exposed to overcrowding stress.
• Evaluated body weight, adrenal gland weight, and macroscopic skin appearance.
• Assessed skin surface conductance, transepidermal water loss (TEWL), and transdermal penetration.
• Quantified ceramide and pyrrolidone carboxylic acid content in the stratum corneum.

Main Results:

• Overcrowding stress led to reduced body weight and increased adrenal gland weight.
• Skin showed exfoliation, wrinkles, and epidermal hyperplasia without inflammation.
• Decreased skin surface conductance and increased TEWL were observed.
• Transdermal penetration of substances was enhanced.
• Significant reductions in ceramide and pyrrolidone carboxylic acid were found in the stratum corneum.

Conclusions:

• Overcrowding stress impairs skin barrier function and water retention properties.
• The observed impairment is associated with a decrease in essential skin components like ceramide and pyrrolidone carboxylic acid.
• Stress-induced dry skin is a consequence of compromised skin barrier and hydration mechanisms.