Epiderm Sit
Epiderm Sit - Related Videos
01:24
Cells of the Epidermis
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2023
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...
01:21
Layers of the Epidermis
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2025
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...
09:39
Live Imaging of Cell Extrusion from the Epidermis of Developing Zebrafish
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Cited by 20 •
2011
Dying cells are extruded from epithelial tissues by concerted contraction of neighboring cells without disrupting barrier function. The optical clarity of developing zebrafish provides an excellent system to visualize extrusion in living epithelia. Here we describe methods to induce and image extrusion in the larval zebrafish epidermis at cellular resolution.
11:27
Immunohistochemistry on Paraffin Sections of Mouse Epidermis Using Fluorescent Antibodies
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Cited by 2 •
2008
We describe a reliable method for immunolocalization within the epidermis modified for both frozen and paraffin sections that we use very routinely in our laboratory.
11:56
Ex Vivo Infection of Murine Epidermis with Herpes Simplex Virus Type 1
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Cited by 15 •
2015
The skin is one target tissue of the human pathogen herpes simplex virus type 1 (HSV-1). To explore the invasion route of HSV-1 into tissue, we established an ex vivo infection model of murine epidermal sheets which represent the outermost layer of skin.
FAQs
Basal stem and progenitor cells provide a continuing source of replacement cells. Their descendants leave the basal layer, move toward the skin surface, and undergo progressive differentiation into keratinocytes. This coordinated pattern balances cell production with the loss of older surface cells through shedding, allowing the epidermis to remain functional over time.
Upward migration links cell production with maturation. As descendants of basal cells move outward, they differentiate and accumulate protective keratin before reaching the surface and being shed. This sequence is important because it connects renewal in the deeper layer with the formation and maintenance of a protective outer barrier.
Melanocytes produce melanin, a pigment that helps protect underlying cells from ultraviolet radiation. This function adds a protective dimension beyond the keratin-based barrier created during keratinocyte differentiation. Studying melanocytes alongside other epidermal cells helps researchers investigate pigmentation and the ways skin cells respond to environmental exposure.
The arrangement of basal stem and progenitor cells, differentiating keratinocytes, and shedding surface cells provides a framework for examining how skin is maintained and repaired. Researchers can use this organization to connect cellular behavior with renewal and wound repair, while also studying how disruptions may relate to dermatological disease or impaired barrier function.
Epidermal research can address several connected processes, including cell renewal, keratinocyte differentiation, pigmentation, ultraviolet protection, barrier function, and wound repair. Because these processes depend on interactions among distinct cell populations and layers, the epidermis offers a useful system for examining how cellular organization produces visible and protective skin functions.
Changes in epidermal cell behavior and organization can be examined in relation to dermatological diseases, inflammation, and aging. Its roles in renewal, pigmentation, and barrier maintenance provide measurable biological contexts for these research areas. Findings can also contribute to tissue-engineering studies aimed at understanding or recreating important properties of skin.