Growth Differentiation Factor 11 Attenuates Photoaging through Ferroptosis Pathway in SZ95 Sebocytes

Area of Science:

• Dermatology and cellular biology
• Skin physiology and photoaging

Background:

• Sebaceous glands produce sebum, crucial for skin barrier function.
• UVB radiation causes sebaceous gland atrophy and reduced sebum, leading to photoaging.
• Cellular senescence and ferroptosis are implicated in skin aging.

Purpose of the Study:

• To investigate UVB irradiation's impact on sebocyte function.
• To determine the role of growth differentiation factor (GDF)-11 in mitigating UVB-induced damage.
• To elucidate the mechanism underlying GDF11's protective effects against sebocyte photoaging.

Main Methods:

• In vitro UVB irradiation of sebocytes.
• Analysis of cellular senescence markers and apoptosis.
• Transmission electron microscopy to identify ferroptosis.
• Assessment of reactive oxygen species, glutathione peroxidase (GPX)-4, ACSL-4, and NCOA-4 expression.
• GDF11 overexpression and knockdown experiments.

Main Results:

• UVB irradiation induced photoaging, impaired sebocyte function, and decreased GDF11 expression.
• GDF11 overexpression attenuated UVB-induced damage and senescence.
• Photoaged cells showed resistance to apoptosis and exhibited ferroptosis markers.
• UVB increased reactive oxygen species and altered ferroptosis-related proteins (decreased GPX4, increased ACSL4).
• GDF11 modulated apoptosis and ferroptosis markers (GPX4, ACSL4).

Conclusions:

• Cumulative UVB exposure causes sebocyte photoaging, potentially via ferroptosis.
• GDF11 mitigates UVB-induced sebocyte photoaging by inhibiting ferroptosis.
• GDF11 represents a potential therapeutic target for preventing or treating skin photoaging.