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The skin as an immune organ
J K Salmon1, C A Armstrong, J C Ansel
1Department of Dermatology, Oregon Health Science University School of Medicine, Portland 97201.
The Western Journal of Medicine
|February 1, 1994
Summary
The skin acts as an active immune organ, not just a barrier. Its epidermis contains specialized immune cells and cytokines that form a frontline defense against environmental threats.
Area of Science:
- Immunology
- Dermatology
- Cell Biology
Background:
- The skin serves as a crucial interface between the body and the external environment.
- It is constantly exposed to toxins, pathogens, and physical stressors.
- Beyond a physical barrier, the skin functions as an active immune organ.
Purpose of the Study:
- To review the immune cells and cytokines within the skin's epidermal immunologic unit.
- To highlight the skin's role as a frontline defense against environmental insults.
Main Methods:
- Review of existing literature on skin immunology.
- Focus on immune-competent cells and soluble mediators within the epidermis.
- Analysis of the functions of epidermal immune components.
Main Results:
- The epidermis harbors various immune-competent cells, including Langerhans cells, keratinocytes, dendritic epidermal T lymphocytes, epidermotropic lymphocytes, and melanocytes.
- These cells, along with cytokines, constitute the epidermal immunologic unit.
- This unit plays a vital role in initiating immune responses against environmental challenges.
Conclusions:
- The epidermis is equipped with a sophisticated array of immune cells and mediators.
- The epidermal immunologic unit is essential for cutaneous immune protection.
- Understanding these components is key to comprehending skin's role in immunity.