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Related Concept Videos

Cells of the Epidermis01:24

Cells of the Epidermis

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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.
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...
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Papillary Dermis01:11

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Dermis
The dermis might be considered the "core" of the integumentary system, as distinct from the epidermis and hypodermis. It contains blood and lymph vessels, nerves, and other structures, such as hair follicles and sweat glands. The dermis is made of two layers of connective tissue that comprise an interconnected mesh of elastin and collagenous fibers, produced by fibroblasts.
Papillary Layer
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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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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
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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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Reticular Dermis01:15

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The papillary and reticular dermis are the two layers of the dermis. They are made of connective tissue with fibers of collagen extending from one to the other, making the border between the two somewhat indistinct. The dermal papillae extending into the epidermis belong to the papillary layer, whereas the dense collagen fiber bundles below belong to the reticular layer.
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Updated: Sep 10, 2025

Lymphocyte Isolation from Human Skin for Phenotypic Analysis and Ex Vivo Cell Culture
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Epidermal and Dermal T Cells Exhibit Distinct Proteomic Signatures.

Amalie Arvesen1, Marcel B M Teunissen2, Sofie Agerbæk1

  • 1Department of Dermatology, Zealand University Hospital, 4600 Roskilde, Denmark.

International Journal of Molecular Sciences
|August 28, 2025
PubMed
Summary

Skin T cells have specialized functions in different layers. Proteomic analysis revealed distinct molecular signatures in epidermal versus dermal T cells, highlighting differences in metabolism and immune surveillance.

Keywords:
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Area of Science:

  • Immunology
  • Proteomics
  • Dermatology

Background:

  • T lymphocytes are crucial for skin immunity and tissue balance.
  • Distinct T cell populations exist in the epidermis and dermis.
  • Understanding their molecular differences is key to skin immune biology.

Purpose of the Study:

  • To characterize the molecular basis of functional specialization in epidermal and dermal T cells.
  • To identify differentially expressed proteins between skin T cell compartments.

Main Methods:

  • Proteomic analysis of T cells isolated from human skin.
  • Utilized flow cytometry and liquid chromatography-tandem mass spectrometry.
  • Quantified thousands of proteins and identified significant differences.

Main Results:

  • Identified 2177 significantly differentially expressed proteins between epidermal and dermal T cells.
  • Epidermal T cells showed higher levels of CD69, complement components, and proteins for oxidative phosphorylation and cholesterol metabolism.
  • Dermal T cells exhibited increased expression of CXCR4 and MHC class II-related proteins.

Conclusions:

  • Distinct proteomic signatures suggest compartment-specific adaptations in skin T cell metabolism, immune surveillance, and antigen presentation.
  • This study provides a molecular resource for skin immune biology research.
  • Findings offer a basis for future investigations into skin immunity and disease implications.