In vitro model of vitamin D3 (cholecalciferol) synthesis by UV radiation : dose–response relationships

Olds, William J., McKinley, Alex R., Moore, Michael R., & Kimlin, Michael G. (2008) In vitro model of vitamin D3 (cholecalciferol) synthesis by UV radiation : dose–response relationships. Journal of Photochemistry and Photobiology B Biology, 93(2), pp. 88-93.

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Vitamin D deficiency is a major health concern worldwide. Very little is understood regarding its production in the human body by exposure to UV radiation. In particular, we have no means of predicting how much vitamin D (cholecalciferol) will be produced in the skin after exposure to sunlight. Using a refined in vitro model, we found that there is a nonlinear relationship between UV dose and cholecalciferol synthesis. Two minimal erythemal doses (MED) of UV radiation produced 1.84 [mu]g/mL of cholecalciferol whereas 4 MED produced 2.81 [mu]g/mL. We also found that the production of cholecalciferol is restricted by the initial concentration of its precursor (7-dehydrocholesterol, 7-DHC). For example, using an initial concentration of 7-DHC of 102 [mu]g/mL, the resultant cholecalciferol production was 1.05 [mu]g/mL after receiving 4 MED exposure. Under the same exposure conditions, an initial concentration of 305 [mu]g/mL yielded 2.81 g/mL of cholecalciferol. The data presented in this paper has important implications for humans, including: (1) increasing UV exposure does not result in a proportionate increase in the amount of cholecalciferol that is produced; and (2) the initial concentration of 7-DHC in the skin may impact the amount of cholecalciferol that can be synthesized. When translating these results to population groups, we will discuss how the sun exposure message needs to be carefully formulated to account for such considerations.

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34 citations in Web of Science®
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ID Code: 17936
Item Type: Journal Article
Refereed: Yes
Additional URLs:
Keywords: Vitamin D, Ultraviolet, UV, Sun, Skin cancer
DOI: 10.1016/j.jphotobiol.2008.07.004
ISSN: 1011-1344
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > PUBLIC HEALTH AND HEALTH SERVICES (111700) > Public Health and Health Services not elsewhere classified (111799)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Public Health & Social Work
Deposited On: 30 Apr 2009 02:36
Last Modified: 29 Feb 2012 13:46

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