Cellular Senescence and Inflammaging in the Skin Microenvironment

Area of Science:

• Immunology
• Dermatology
• Gerontology

Background:

• Cellular senescence, a state of irreversible growth arrest, contributes to aging and age-related diseases.
• Chronic low-level inflammation, termed "inflammaging", is a hallmark of aging and linked to systemic diseases and skin aging.
• The skin, constantly exposed to environmental stressors, is susceptible to senescence and immune alterations.

Purpose of the Study:

• To review the mechanisms of senescence cell accumulation in various skin compartments.
• To explore the association between senescent cells and skin-resident immune cells.
• To describe the changes in cutaneous immunity during the aging process.

Main Methods:

• Literature review focusing on cellular senescence, inflammaging, and skin aging.
• Analysis of mechanisms driving senescence cell accumulation in skin cell types.
• Examination of interactions between senescent cells and cutaneous immune cells.

Main Results:

• Senescence cell accumulation occurs in different skin compartments (epidermis, dermis, adnexa) via various mechanisms.
• Senescent cells modulate the function of skin-resident immune cells, including immune cells and keratinocytes.
• These interactions contribute to chronic inflammation and altered skin immunity characteristic of aging.

Conclusions:

• Senescence cell accumulation and subsequent immune dysregulation are key drivers of skin aging.
• Understanding these mechanisms offers potential targets for interventions against age-related skin changes.
• Further research into cutaneous immunity and senescence is crucial for healthy aging strategies.