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Related Concept Videos

Renewal of Skin Epidermal Stem Cells01:12

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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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All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
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The cells of the blastocyst inner cell mass only remain pluripotent for a short time. This state of pluripotency and self-renewal can be maintained in embryonic stem (ES) cell culture by adding specific chemicals or growth factors to ensure the cells can continue dividing and later differentiate into different cell types. In some cases, the cells are grown on a feeder layer of differentiated cells, which provides the growth factors and extracellular matrix components necessary for stem cell...
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Clinical Applications of Epidermal Stem Cells01:19

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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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Renewal of Intestinal Stem Cells01:23

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The intestinal epithelial lining rapidly renews every 4 to 5 days. The renewal is facilitated by intestinal stem cells (ISCs) located at the base of the crypt– a gland located at the bottom of each villus. ISCs divide asymmetrically to form new stem cells and progenitor daughter cells. The daughter cells are called transit-amplifying (TA) cells which move upwards along the crypt and either differentiate into absorptive cells– the enterocytes or secretory cells– including the...
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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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Related Experiment Video

Updated: May 29, 2025

Isolating Hair Follicle Stem Cells and Epidermal Keratinocytes from Dorsal Mouse Skin
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CD4 expression controls epidermal stem cell balance.

Nadine Brandes1, Heidi Hahn1, Anja Uhmann2

  • 1Institute of Human Genetics, Tumor Genetics Group, Universitätsmedizin Göttingen, Heinrich-Düker-Weg 12, 37073, Göttingen, Germany.

Scientific Reports
|February 5, 2025
PubMed
Summary
This summary is machine-generated.

CD4 is expressed on mouse epidermal stem cells, crucial for skin renewal and repair. Loss of CD4 impairs stem cell balance and wound healing, highlighting its role in maintaining skin homeostasis.

Keywords:
CD4Epidermal stem cellsInfundibulumInterfollicular epidermisWound healing

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Area of Science:

  • Dermatology
  • Stem Cell Biology
  • Immunology

Background:

  • Epidermal stem cell balance is vital for skin maintenance, renewal, and repair.
  • CD4 is typically known as a marker for immune cells like T cells and macrophages.
  • The expression and function of CD4 on epidermal cells remain largely unexplored.

Purpose of the Study:

  • To investigate the presence and function of CD4 on murine epidermal stem cells.
  • To determine the role of CD4+ epidermal cells in skin homeostasis and repair.
  • To elucidate the impact of CD4 expression on epidermal stem cell maintenance and aging.

Main Methods:

  • Utilized lineage tracing to track the progeny of CD4+ epidermal cells in mice.
  • Performed wound healing assays to assess the regenerative capacity of CD4+ cells.
  • Generated and analyzed CD4 knockout mice to study the effects of CD4 loss.

Main Results:

  • CD4 is expressed on K5+ keratinocytes in murine epidermis.
  • CD4+ epidermal cells possess self-renewal and clonogenic potential, contributing to epidermal lineages.
  • CD4 is essential for maintaining fast-cycling epidermal stem cells and mitigates age-related decline in wound repair.

Conclusions:

  • CD4 expression on epidermal cells is critical for maintaining the balance of epidermal stem cell populations.
  • CD4+ epidermal cells contribute to skin renewal, repair, and colonization of epidermal structures.
  • Targeting CD4 may offer therapeutic potential for improving skin regeneration and addressing age-related repair deficits.