Vitamin D3 → 7-Dehydrocholesterol

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For the treatment with vitamin D metabolites, stock solutions of 2 mM 7-Dehydrocholesterol (7-DHC, Sigma St. Louis, Mo., USA), 2 μM cholecalciferol (D3, Sigma St. Louis, Mo., USA), and 2 μM 25-Hydroxyvitamin D (25-D3, Sigma St. Louis, Mo., USA) were prepared in absolute ethanol and filtered with a 0.22 mm pore size filter before use. Fourteen different groups were prepared; eight were non irradiated: 7-DHC at different doses (20 nmols, 2 nmols, 0.2 nmols, 2×10−2 nmols, and 2×10−3 nmols), 2×10−2 nmols D3, 2×10−2 nmols 25-D3 and ethanol. And six were UV-irradiated: 7-DHC at the same different doses (20 nmols, 2 nmols, 0.2 nmols, 2×10−2 nmols, and 2×10−3 nmols) and ethanol.

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