Epithelial stem cells in the skin: definition, markers, localization and functions

Area of Science:

• Dermatology
• Stem Cell Biology
• Regenerative Medicine

Background:

• Cutaneous epithelial stem cells are crucial for skin regeneration and are targets for gene therapy.
• These stem cells are implicated in skin appendage development and tumorigenesis.
• There is a lack of consensus on defining, identifying, and localizing these cells.

Purpose of the Study:

• To re-evaluate the fundamental questions surrounding epithelial stem cells.
• To clarify the definition, identification, and functional diversity of cutaneous epithelial stem cells.
• To determine the precise localization of putative stem cell subpopulations and explore their selective manipulation.

Main Methods:

• Review and critical analysis of existing literature and expert opinions.
• Discussion of controversies in the field of cutaneous stem cell research.
• Conceptual framework development for stem cell identification and characterization.

Main Results:

• The precise definition and identification criteria for cutaneous epithelial stem cells are still debated.
• The functional heterogeneity and precise localization of different stem cell subpopulations require further elucidation.
• Current understanding limits the selective manipulation of these cells for therapeutic purposes.

Conclusions:

• A clear, universally accepted definition and reliable identification methods for cutaneous epithelial stem cells are lacking.
• Further research is essential to understand the functional roles and spatial organization of these cells.
• Establishing these fundamentals is critical for advancing skin biology, pathology, and dermatological therapies.