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Vitamin A metabolism and mRNA expression of retinoid-binding protein and receptor genes in human epidermal melanocytes and melanoma cells
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Sciences. (Dermatology and Venereology)
1997 (English)In: Melanoma research, ISSN 0960-8931, Vol. 7, no 4, 267-74 p.Article in journal (Refereed) Published
Abstract [en]

Retinoids inhibit proliferation of melanocytes and melanoma cells and affect disorders of hypo- and hyperpigmentation. Such effects might involve retinoid-binding proteins, retinoid metabolites and nuclear retinoid receptors for transcriptional activation. We detected messenger RNA transcripts for the cellular retinol- and retinoic acid-binding proteins (CRBP, CRABP I and II) in cultured epidermal melanocytes. In the melanoma cell lines the major transcript was CRABP II. Nuclear retinoic acid (RA) receptor transcripts and the 9-cis-retinoic acid receptor transcript were detected in all cells. The endogenous concentrations of retinol (ROH) and its metabolite 3,4-didehydroretinol (ddROH) in melanocytes were five times those in melanoma cells. When cells were incubated with [3H]ROH the main metabolites in the melanocytes were [3H]ddROH (4%) and [3H]RA (0.4%). Formation of [3H]RA was only detected in one melanoma cell line. Both melanocytes and melanoma cells produced an unidentified metabolite when incubated with [3H]ROH and [3H]RA. Dissimilarities in the metabolism and endogenous concentration of retinoids between benign and malignant melanocytes might play a key role in differentiation and growth regulation.

Place, publisher, year, edition, pages
1997. Vol. 7, no 4, 267-74 p.
National Category
Medical and Health Sciences
URN: urn:nbn:se:uu:diva-55459PubMedID: 9293476OAI: oai:DiVA.org:uu-55459DiVA: diva2:83367
Available from: 2008-10-17 Created: 2008-10-17 Last updated: 2009-10-15Bibliographically approved

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