Epidermal Renewal
Epidermal Renewal - Related Videos
01:12
Renewal of Skin Epidermal Stem Cells
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2023
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,...
21:16
An In Vitro Skin Irritation Test (SIT) using the EpiDerm Reconstructed Human Epidermal (RHE) Model
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Cited by 57 •
2009
In this video, we demonstrate the EpiDerm Skin Irritation test (EpiDerm SIT) developed and validated for in vitro skin irritation testing of chemicals, including cosmetic and pharmaceutical ingredients.
05:58
The use of SC1 (Pluripotin) to Support mESC Self-renewal in the Absence of LIF
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Cited by 7 •
2009
SC1 functions through dual inhibition of Ras- GAP and ERK1. We tested the function of SC1 in supporting mouse ES cell self-renewal in the absence of LIF and showed that SC1 is able to maintain self-renewal of mouse ES cell cultures.
08:29
Mouse Epidermal Neural Crest Stem Cell (EPI-NCSC) Cultures
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Cited by 15 •
2008
Here we show our method to isolate mouse epidermal neural crest stem cells (EPI-NCSC). Technique involves micro-dissecting whisker follicles, isolating the bulge and placeing it into tissue culture. EPI-NCSC start to emigrate from bulge explants onto the substratum within 3 - 4 days.
12:37
Pharmacologic Induction of Epidermal Melanin and Protection Against Sunburn in a Humanized Mouse Model
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Cited by 13 •
2013
Epidermal melanin is induced by topical application of forskolin in a murine model of the fair-skinned UV-sensitive human. Pharmacologic manipulation of cAMP levels in the skin and epidermal darkening strongly protect against UV-mediated inflammation (sunburn) as measured by the minimum erythematous dose (MED) assay.
FAQs
The basal layer serves as the renewal reservoir for the epidermis. Division of stem and progenitor cells supplies new keratinocytes, while outward migration moves their descendants toward the surface. This arrangement links cell production with positional change, allowing differentiation to occur as cells leave the basal compartment and helping maintain a continuously replenished epidermis.
Keratin accumulation marks a major differentiation change as keratinocytes move toward the surface. Eventually, these cells detach through desquamation, connecting cellular maturation with normal shedding. The sequence ensures that cells are transformed into protective surface material before removal, supporting the continuity of the epidermal barrier during ongoing tissue maintenance.
Renewal and desquamation represent linked sides of epidermal maintenance. New keratinocytes replace cells lost from the surface, while controlled shedding prevents the outer layer from simply accumulating older cells. Their coordination supports barrier integrity, hydration, and defense against physical and microbial stress, showing why surface loss is an essential part of normal maintenance.
During wound healing, the cellular principles of epidermal renewal provide a framework for understanding how a damaged surface may be restored. Researchers can examine basal stem and progenitor activity, keratinocyte migration, differentiation, and subsequent shedding to study how replacement is organized after injury. This makes renewal relevant to tissue repair as well as routine maintenance.
The renewal cycle connects basal cell activity, keratinocyte differentiation, and surface shedding with barrier integrity and hydration. Studying these relationships helps explain how skin aging and inflammatory disorders relate to tissue maintenance. It also provides a biological context for examining whether altered renewal is associated with changes in the protective functions of the epidermis.
Researchers can assess how therapeutic agents or environmental exposures influence tissue maintenance by following the linked events of cell production, outward movement, differentiation, keratin accumulation, and shedding. These studies can connect a treatment or exposure with outcomes involving barrier integrity, hydration, and defense against physical or microbial stress, clarifying its effects on epidermal function.