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Related Concept Videos

Renewal of Skin Epidermal Stem Cells01:12

Renewal of Skin Epidermal Stem Cells

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 cells,...
Clinical Applications of Epidermal Stem Cells01:19

Clinical Applications of Epidermal Stem Cells

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 EpiSCs...
Cells of the Epidermis01:24

Cells of the Epidermis

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.
The cells in all these layers except the stratum basale are called keratinocytes, a type of cell that manufactures and stores the protein keratin. The keratinocytes in the stratum corneum are dead and regularly slough away, being replaced by cells from...
Multipotency and Niche of Bulge Stem Cell01:06

Multipotency and Niche of Bulge Stem Cell

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...
Adult Stem Cells01:33

Adult Stem Cells

Stem cells are undifferentiated cells that divide and produce more stem cells or progenitor cells that differentiate into mature, specialized cell types. All the cells in the body are generated from stem cells in the early embryo, but small populations of stem cells are also present in many adult tissues including the bone marrow, brain, skin, and gut. These adult stem cells typically produce the various cell types found in that tissue—to replace cells that are damaged or to continuously renew...
Layers of the Epidermis01:21

Layers of the Epidermis

The epidermis, the outermost layer of the skin, is composed of several distinct layers. From deep to superficial, the layers of the epidermis are as follows:
Stratum Basale
Stratum basale, also known as the stratum germinativum, is the deepest layer of the epidermis. It is composed of a single layer of actively dividing cells called basal cells or basal keratinocytes. These cells constantly undergo cell division to replenish the upper layers of the epidermis. Additionally, melanocytes, which...

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Live Cell Imaging with Time Lapse Photography to Study Epidermal Keratinocyte Proliferation Kinetics
07:21

Live Cell Imaging with Time Lapse Photography to Study Epidermal Keratinocyte Proliferation Kinetics

Published on: June 6, 2025

[Progress in epidermal stem cells].

Li-Juan Wang1, You-Liang Wang, Xiao Yang

  • 1State Key Laboratory of Proteomics, Genetic Laboratory of Development and Diseases, Institute of Biotechnology, Academy of Military Medical Sciences, Beijing 100071, China. wanglijuan-2002@163.com

Yi Chuan = Hereditas
|March 18, 2010
PubMed
Summary
This summary is machine-generated.

Mammalian skin epidermis relies on epidermal stem cells for repair and homeostasis. Maintaining the balance between their self-renewal and differentiation is crucial for preventing skin diseases.

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Area of Science:

  • Dermatology and Stem Cell Biology

Background:

  • Mammalian skin epidermis harbors distinct epidermal stem cell pools essential for tissue homeostasis and repair.
  • Epidermal stem cells are characterized by self-renewal and differentiation capabilities, critical for maintaining skin integrity.

Purpose of the Study:

  • To review the current understanding of epidermal stem cells.
  • To explore factors influencing their self-renewal, differentiation, and the role of their microenvironment.

Main Methods:

  • Literature review focusing on epidermal stem cell biology.
  • Analysis of evidence regarding stem cell behavior and regulatory pathways.

Main Results:

  • Epidermal stem cell niches regulate stem cell quiescence and activity.
  • Imbalances in self-renewal and differentiation can lead to skin pathologies like tumors.

Conclusions:

  • Understanding epidermal stem cell dynamics, including their division patterns, signaling pathways, and niche interactions, is key to maintaining skin homeostasis.
  • Further research into these aspects can inform therapeutic strategies for skin diseases.