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Issue 6, 2013
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UV-irradiated 7-dehydrocholesterol coating on polystyrene surfaces is converted to active vitamin D by osteoblastic MC3T3-E1 cells

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Abstract

The aim of the present study was to determine the effects of UV irradiation on the conversion of 7-dehydrocholesterol (7-DHC), which has been coated onto a polystyrene surface, to cholecalciferol (D3), and the resulting effect on the formation of vitamin D (1,25-D3) by MC3T3-E1 cells. The changes in gene expression of the enzymes regulating its hydroxylation, Cyp27b1 and Cyp27a1, were monitored as well as the net effect of the UV-treated 7-DHC coating on cell viability and osteoblast differentiation. MC3T3-E1 cells were found to express the enzymes required for synthesizing active 1,25-D3, and we found a dose-dependent increase in the production of both 25-D3 and 1,25-D3 levels for UV-activated 7-DHC samples unlike UV-untreated ones. Cell viability revealed no cytotoxic effect for any of the treatments, but only for the highest dose of 7-DHC (20 nmol per well) that was UV-irradiated. Furthermore, osteoblast differentiation was increased in cells treated with some of the higher doses of 7-DHC when UV-irradiated, as shown by collagen-I, osterix and osteocalcin relative mRNA levels. The conversion of 7-DHC to preD3 exogenously by UV irradiation and later to 25-D3 by MC3T3-E1 cells was determined for the optimum 7-DHC dose (0.2 nmol per well), i.e. 8.6 ± 0.7% of UV-activated 7-DHC was converted to preD3 and 6.7 ± 2.8% of preD3 was finally converted to 25-D3 under the conditions studied. In conclusion, we demonstrate that an exogenous coating of 7-DHC, when UV-irradiated, can be used to endogenously produce active vitamin D. We hereby provide the scientific basis for UV-activated 7-DHC coating as a feasible approach for implant therapeutics focused on bone regeneration.

Graphical abstract: UV-irradiated 7-dehydrocholesterol coating on polystyrene surfaces is converted to active vitamin D by osteoblastic MC3T3-E1 cells

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Publication details

The article was received on 29 Jan 2013, accepted on 13 Mar 2013 and first published on 14 Mar 2013


Article type: Paper
DOI: 10.1039/C3PP50025J
Photochem. Photobiol. Sci., 2013,12, 1025-1035

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    UV-irradiated 7-dehydrocholesterol coating on polystyrene surfaces is converted to active vitamin D by osteoblastic MC3T3-E1 cells

    M. Satué, A. Córdoba, J. M. Ramis and M. Monjo, Photochem. Photobiol. Sci., 2013, 12, 1025
    DOI: 10.1039/C3PP50025J

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