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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...
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...
Reticular Dermis01:15

Reticular Dermis

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.
Reticular Layer
Underlying the papillary layer is the much thicker reticular layer, composed of dense, irregular connective...
Papillary Dermis01:11

Papillary Dermis

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
The papillary layer is made of loose, areolar connective tissue, which means the collagen and...
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...
Skin Diseases and Disorders01:23

Skin Diseases and Disorders

Skin is the first line of defense and encounters a variety of microbes. Some pathogenic strains are often the cause of a broad range of infections of the skin and other body systems. These conditions can affect people of all ages and may have different causes, including genetic factors, infections, autoimmune reactions, environmental factors, and lifestyle choices.
Gram-positive Staphylococcus spp. and Streptococcus spp. are responsible for many of the most common skin infections. However, many...

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Building Up Skin Models for Numerous Applications - from Two-Dimensional (2D) Monoculture to Three-Dimensional (3D) Multiculture
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The Caucasian and African skin types differ morphologically and functionally in their dermal component.

Sarah Girardeau1, Solène Mine, Hervé Pageon

  • 1L'Oréal Research, 92583 Clichy cedex, France. sgirardeau@rd.loreal.com

Experimental Dermatology
|May 28, 2009
PubMed
Summary

African skin has a significantly more convoluted dermal-epidermal junction and higher papillary fibroblast activity compared to Caucasian skin, indicating deeper biological differences beyond pigmentation.

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Area of Science:

  • Dermatology
  • Cell Biology
  • Human Anatomy

Background:

  • Existing research on skin differences between African and Caucasian individuals primarily focuses on pigmentation and stratum corneum barrier function.
  • Limited knowledge exists regarding morphological and functional disparities in the dermis and dermal-epidermal junction (DEJ).

Purpose of the Study:

  • To investigate architectural differences in Caucasian and African mammary skin using microscopy.
  • To compare the constitutive expression of cytokines, matrix metalloproteinase 1 (MMP-1), and its inhibitors in dermal fibroblast cultures from different ethnic groups.

Main Methods:

  • Microscopic analysis of Caucasian and African mammary skin biopsies.
  • Culture of papillary dermal fibroblasts (pF) and reticular dermal fibroblasts (rF).
  • Quantitative analysis of cytokine, MMP-1, and tissue inhibitor of metalloproteinase 1 (TIMP-1) protein expression in fibroblast cultures.

Main Results:

  • African skin exhibited a dermal-epidermal junction (DEJ) length approximately threefold greater than Caucasian skin; no significant differences in epidermis or superficial dermis thickness were observed.
  • Papillary fibroblast cultures from African donors showed significantly higher monocyte chemotactic peptide-1 (MCP-1) protein levels compared to Caucasian donors.
  • African donors displayed a twofold greater ratio of papillary to reticular fibroblast expression for keratinocyte growth factor (KGF), MMP-1, and TIMP-1 compared to Caucasians.

Conclusions:

  • African skin possesses a more convoluted DEJ and enhanced papillary fibroblast activity, suggesting functional differences extending beyond the epidermis.
  • These findings highlight significant variations in dermal functions and dermal-epidermal cellular interactions between African and Caucasian skin.