Characterization of serotonin and N-acetylserotonin systems in the human epidermis and skin cells.

Journal of Pineal Research
Andrzej T SlominskiDesmond J Tobin

Abstract

Tryptophan hydroxylase (TPH) activity was detected in cultured epidermal melanocytes and dermal fibroblasts with respective Km of 5.08 and 2.83 mM and Vmax of 80.5 and 108.0 µmol/min. Low but detectable TPH activity was also seen in cultured epidermal keratinocytes. Serotonin and/or its metabolite and precursor to melatonin, N-acetylserotonin (NAS), were identified by LC/MS in human epidermis and serum. Endogenous epidermal levels were 113.18 ± 13.34 and 43.41 ± 12.45 ng/mg protein for serotonin (n = 8/8) and NAS (n = 10/13), respectively. Their production was independent of race, gender, and age. NAS was also detected in human serum (n = 13/13) at a concentration 2.44 ± 0.45 ng/mL, while corresponding serotonin levels were 295.33 ± 17.17 ng/mL (n = 13/13). While there were no differences in serum serotonin levels, serum NAS levels were slightly higher in females. Immunocytochemistry studies showed localization of serotonin to epidermal and follicular keratinocytes, eccrine glands, mast cells, and dermal fibrocytes. Endogenous production of serotonin in cultured melanocytes, keratinocytes, and dermal fibroblasts was modulated by UVB. In conclusion, serotonin and NAS are produced endogenously in the epidermal, dermal, and adnexa...Continue Reading

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Citations

Apr 25, 2020·International Journal of Molecular Sciences·Iona J MacDonaldChih-Hsin Tang
Sep 10, 2020·Frontiers in Bioengineering and Biotechnology·Micaela BalcázarAndrés Caicedo
Mar 3, 2021·Journal of Pineal Research·Bernadetta BilskaKonrad Kleszczyński
Mar 16, 2021·Molecular and Cellular Endocrinology·Slominski RmTuckey Rc

Related Concepts

N-acetylserotonin
Adult
Elderly (population group)
Nonagenarians
Epidermis
Females
Fibroblasts
Homo sapiens
Males
Melatonin

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