Functional activity of serotoninergic and melatoninergic systems expressed in the skin
Article first published online: 23 APR 2003
Copyright © 2003 Wiley-Liss, Inc.
Journal of Cellular Physiology
Volume 196, Issue 1, pages 144–153, July 2003
How to Cite
Slominski, A., Pisarchik, A., Zbytek, B., Tobin, D. J., Kauser, S. and Wortsman, J. (2003), Functional activity of serotoninergic and melatoninergic systems expressed in the skin. J. Cell. Physiol., 196: 144–153. doi: 10.1002/jcp.10287
- Issue published online: 19 MAY 2003
- Article first published online: 23 APR 2003
- Manuscript Accepted: 31 DEC 2002
- Manuscript Received: 2 AUG 2002
We tested the expression of genes coding receptors of a cutaneous serotoninergic/melatoninergic system in whole human skin and in normal and pathologic cultured skin cells. Evaluation of serotonin (5HT), melatonin (MT), and melatonin-related receptors (MRR) showed expression of the isoforms 5HT2B, 5HT7, and MT1 genes in almost all the tested samples. Expression of other isoforms was less prevalent; 5HT2C, MRR, and MT2 were rarely detected. We also found novel isoforms for MT2, MRR, and 5HT2B and documented the process of RNA editing for 5HT2C. Testing for functional activity of these receptors with serotonin and melatonin (10−14 to 10−10 M) showed variable effects depending on cell type and culture conditions. Thus, serotonin stimulated proliferation of melanocytes in medium deprived of growth factors, while inhibiting cell growth in the presence of growth factors. Melatonin inhibited both apoptosis of HaCaT keratinocytes incubated in serum-free media, and proliferation of cells cultured in medium supplemented with serum. Melatonin also increased the numbers of viable fibroblasts incubated in serum free medium. N-acetylserotonin (NAS) and 5 methoxytryptamine (5MTT) were generally without effect on cell proliferation, with the exception of an inhibition of melanocyte proliferation at the higher 5MTT concentration of 10−10 M. Thus, skin cells represent a true target for the products of the serotoninergic/melatoninergic cutaneous pathway with their actions modulating cell proliferation or viability. © 2003 Wiley-Liss, Inc.