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Related Concept Videos

Pigmentation01:19

Pigmentation

The color of the skin is influenced by a number of pigments, including melanin, carotene, and hemoglobin. Recall that melanin is produced by cells called melanocytes, which are found scattered throughout the stratum basale of the epidermis. The melanin is transferred to the keratinocytes via melanosomes.
Melanin occurs in two primary forms: eumelanin that provides black and brown pigment and pheomelanin that provides red color. Dark-skinned individuals produce more melanin than those with pale...
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...
The Pineal Gland01:02

The Pineal Gland

The pineal gland, a diminutive endocrine structure named for its pinecone-shaped appearance, is situated atop the third ventricle within the diencephalon region of the forebrain. This gland, composed of secretory cells known as pinealocytes arranged in compact cords and clusters around dense particles of calcium salts, plays a pivotal role in hormonal regulation.
The primary secretion of the pineal gland is the hormone melatonin, derived from serotonin. The concentration of melatonin in the...
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,...
Accessory Structures of the Skin: Hair Growth and Types01:20

Accessory Structures of the Skin: Hair Growth and Types

Hair growth begins with the production of keratinocytes by the basal cells of the hair bulb. As new cells are deposited at the hair bulb, the hair shaft is pushed through the follicle toward the surface. Keratinization is completed as the cells are pushed to the skin surface to form the shaft of hair that is externally visible. The external hair is completely dead and composed entirely of keratin. Hair can be cut or shaven without damaging the hair structure because the cut is superficial. Most...
Introduction to the Integumentary System01:25

Introduction to the Integumentary System

The integumentary system is the organ system that comprises the skin and its associated structures. It is the largest system in the human body and plays a crucial role in protecting and maintaining homeostasis. The integumentary system serves several functions including protection, regulation, sensation, and secretion.
The skin, which is the primary organ of the integumentary system, consists of three main layers: the epidermis, dermis, and hypodermis (subcutaneous tissue). The epidermis is the...

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Related Experiment Video

Updated: Jun 21, 2026

Rapid Generation of Primary Murine Melanocyte and Fibroblast Cultures
06:32

Rapid Generation of Primary Murine Melanocyte and Fibroblast Cultures

Published on: June 26, 2019

What are melanocytes really doing all day long...?

P M Plonka1, T Passeron, M Brenner

  • 1Department of Biophysics, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, PL-30-387 Kraków, Poland. przemyslaw.plonka@uj.edu.pl

Experimental Dermatology
|August 8, 2009
PubMed
Summary

Melanocytes, known for melanin production, have diverse, under-appreciated functions beyond skin pigmentation and UV protection. Future research should explore their full physiological roles and interactions within the skin microenvironment.

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Last Updated: Jun 21, 2026

Rapid Generation of Primary Murine Melanocyte and Fibroblast Cultures
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Published on: June 26, 2019

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Feeder-free Derivation of Melanocytes from Human Pluripotent Stem Cells
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Feeder-free Derivation of Melanocytes from Human Pluripotent Stem Cells

Published on: March 3, 2016

Area of Science:

  • Cell biology
  • Dermatology
  • Immunology

Background:

  • Melanocytes are primarily recognized for melanin synthesis, providing skin pigmentation and UV protection.
  • The full spectrum of melanocyte physiological functions, particularly in epidermal and hair follicle contexts beyond pigmentation, remains largely unelucidated.
  • Conventional understanding may overestimate melanocyte contributions to UV protection and underestimate their broader roles.

Purpose of the Study:

  • To critically re-examine the multifaceted physiological functions of melanocytes in mammalian skin.
  • To investigate the roles of melanocytes beyond pigmentation and UV protection, including their interactions with the epithelial environment and immune responses.
  • To explore insights from lower vertebrates and extracutaneous melanocytes to reveal the 'secret identity' of skin melanocytes.

Main Methods:

  • Literature review and critical analysis of existing concepts and novel ideas in melanocyte biology.
  • Comparative analysis of melanocyte functions across different species and locations (e.g., lower vertebrates, extracutaneous sites).
  • Exploration of interactions between melanocytes and their epithelial microenvironment, including cellular communication and control mechanisms.

Main Results:

  • Melanocytes possess a complex and incompletely understood portfolio of physiological functions.
  • These cells engage in intricate interactions with their surrounding epithelial environment, influencing skin and hair follicle homeostasis.
  • Evidence suggests melanocytes play roles in skin immunity and homeostasis that extend beyond their established functions.

Conclusions:

  • Melanocyte biology is more complex than commonly perceived, with significant functions yet to be fully understood.
  • Further research is crucial to define the complete physiological repertoire of melanocytes and their clinical relevance.
  • Understanding these diverse roles is essential for advancing dermatology, cell biology, and immunology.