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Related Concept Videos

Renewal of Skin Epidermal Stem Cells01:12

Renewal of Skin Epidermal Stem Cells

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The skin is divided into epidermis, dermis, and hypodermis, the skin's outermost, middle, and inner layers. The human epidermal layer regularly undergoes renewal, where old, dead cells are replaced by new cells. Epidermal stem cells or EpiSCs divide and differentiate to restore the lost cells. For the renewal process, some EpiSCs continuously self-renew. In contrast, few others differentiate into transit-amplifying cells, which later form prickle or spinous cells, followed by granular...
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Epidermal stem cells (EpiSCs) are mainly located at the basal layer of the epidermis. These cells repair minor injuries of the skin and replace dead skin cells. However, EpiSCs’ cannot heal severe wounds such as major burns or those from diabetes or hereditary disorders. In such cases, culturing the epidermal stem cells from the patient is possible and has yielded successful treatment options, such as laboratory-grown skin grafts. These grafts are synthesized using a patient’s own...
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Cells of the Epidermis01:24

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The epidermis is made of four or five layers of epithelial cells, depending on its location in the body. From deep to superficial, these layers are the stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, and stratum corneum.
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The development of all multicellular organisms starts with the fusion of haploid cells called sperm and egg to form a diploid zygote. A zygote is a totipotent cell that can develop into a complete organism. The zygote undergoes cell division or cleavage to form an 8-cell mass. Until this stage, the cells are spherical, loosely attached, and remain totipotent. Totipotent cells are capable of developing both the embryonic and the extraembryonic tissues. However, as they continue to divide, they...
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A hair follicle or HF is a small part of the skin that produces the hair shaft. Paul Gerson Unna was the first to observe a bulge in the human hair follicle's outer root sheath (ORS). The bulge is present between the sebaceous gland and the arrector pili muscle and is the niche for hair follicle stem cells (HFSCs). The bulge is also a niche for melanocyte stem cells, and their loss results in graying of hair. The HFSCs express Sox9 and Lhx2, which help them maintain stemness and prevent...
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Isolating Hair Follicle Stem Cells and Epidermal Keratinocytes from Dorsal Mouse Skin
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Stem cell patterning and fate in human epidermis

P H Jones1, S Harper, F M Watt

  • 1Keratinocyte Laboratory, Imperial Cancer Research Fund, London, England.

Cell
|January 13, 1995
PubMed
Summary
This summary is machine-generated.

Human epidermis contains stem cells and transit-amplifying cells. Stem cells express higher integrin levels, aiding their identification and isolation within the skin. This finding advances our understanding of skin cell dynamics.

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Last Updated: Apr 2, 2026

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Area of Science:

  • Dermatology
  • Cell Biology
  • Biochemistry

Background:

  • Human epidermis comprises two proliferating keratinocyte populations: stem cells with high proliferative potential and transit-amplifying cells destined for differentiation.
  • Understanding the distinct markers and localization of these cell types is crucial for regenerative medicine and skin research.

Purpose of the Study:

  • To identify specific markers for distinguishing human epidermal stem cells from transit-amplifying cells in vivo.
  • To investigate the spatial distribution and potential self-regulation of these cell populations within the epidermis.

Main Methods:

  • Utilized in vivo analysis of human epidermis.
  • Quantified and compared the expression levels of alpha 2 beta 1 and alpha 3 beta 1 integrins in stem cells versus transit-amplifying cells.
  • Observed cell distribution relative to the epidermal-dermal junction and S phase cells.
  • Recreated stem cell patterning in cultured keratinocytes.

Main Results:

  • Stem cells express significantly higher levels of alpha 2 beta 1 and alpha 3 beta 1 integrins compared to transit-amplifying cells.
  • Integrin expression levels serve as reliable markers for identifying and isolating epidermal stem cells directly from tissue.
  • Stem and transit-amplifying cell distribution is non-random, forming distinct patterns relative to the epidermal-dermal junction, which vary by body site.
  • These spatial patterns correlate with the distribution of cells in S phase.
  • Stem cell patterning can be replicated in vitro, suggesting autocrine regulation.

Conclusions:

  • Alpha 2 beta 1 and alpha 3 beta 1 integrins are key markers for identifying and isolating human epidermal stem cells.
  • The non-random, site-specific distribution of epidermal stem and transit-amplifying cells suggests underlying organizational principles.
  • Epidermal stem cell patterning exhibits self-regulatory properties, potentially independent of dermal influence.