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A serotonin-like immunoreactivity is present in human cutaneous melanocytes
O Johansson1, P Y Liu, L Bondesson
1Department of Neuroscience, Karolinska Institute, Stockholm, Sweden.
The Journal of Investigative Dermatology
|December 18, 1998
Summary
Human skin melanocytes show serotonin-like immunoreactivity, suggesting they produce serotonin or a similar molecule. This finding opens new avenues for understanding skin physiology and potential therapeutic targets.
Area of Science:
- Dermatology
- Neuroscience
- Cell Biology
Background:
- Serotonin, a key neurotransmitter, plays diverse roles in the body.
- Its presence and function within human skin, particularly in melanocytes, remain largely unexplored.
Purpose of the Study:
- To investigate the presence and localization of serotonin or serotonin-like molecules in human skin.
- To determine if epidermal melanocytes are a source of serotonin in the skin.
Main Methods:
- Immunohistochemistry was employed to detect serotonin-like immunoreactivity in human skin.
- Blocking experiments and co-localization with melanocyte markers (NKI-beteb) were performed.
- In vitro studies utilized cultured human melanocytes to confirm findings.
Main Results:
- Epidermal melanocytes exhibited serotonin-like immunoreactivity in both cytoplasm and cellular membranes.
- This immunoreactivity co-localized with the melanocyte marker NKI-beteb.
- In vitro studies confirmed serotonin-like immunoreactivity in approximately 90% of cultured melanocytes, including nuclear localization.
Conclusions:
- Human skin melanocytes express serotonin or a serotonin-like molecule.
- Melanocytes are likely the endogenous source of serotonin within the skin.
- This discovery may have implications for skin biology and related disorders.