Increased subcutaneous adipose tissue impairs dermal function in diet-induced obese mice.

Area of Science:

• Dermatology
• Metabolic Research
• Aging Studies

Background:

• Subcutaneous adipose tissue expansion is linked to facial aging, but its impact on dermal structure remains unclear.
• Understanding the dermal effects of increased fat is crucial for addressing age-related skin changes.

Purpose of the Study:

• To investigate how increased subcutaneous adipose tissue affects dermal structure and function.
• To elucidate the mechanisms underlying fat-induced dermal alterations and skin sagging.

Main Methods:

• HR-1 hairless mice were fed a high-fat diet (HFD) for 12 weeks to induce obesity.
• Dermal thickness, fibroblast count, extracellular matrix gene expression, and dermal elasticity were assessed.
• Comparisons were made between obese mice and control mice on a normal diet.

Main Results:

• Obese mice exhibited significantly thickened subcutaneous adipose tissue and thinned dermis compared to controls.
• A significant reduction in dermal fibroblast numbers was observed in obese mice.
• Dermal elasticity decreased significantly in obese mice, without changes in key extracellular matrix gene expression.

Conclusions:

• Increased subcutaneous adipose tissue in obesity can impair dermal biomechanical properties.
• Reduced dermal fibroblast proliferation and decreased skin elasticity contribute to sagging.
• Targeting subcutaneous fat may be a strategy to mitigate age-related skin aging and sagging.