Conflicts of interest:
Miniature swine model of phototoxicity testing
Article first published online: 28 DEC 2011
© 2012 John Wiley & Sons A/S
Photodermatology, Photoimmunology & Photomedicine
Volume 28, Issue 1, pages 34–41, Febuary 2012
How to Cite
Leigh, H., Forbes, P. D., Lawson, C., Kim, D. Y., White, D., Brown, L. D., Wehmeier, D. R., Liu, J. and Bouchard, G. F. (2012), Miniature swine model of phototoxicity testing. Photodermatology, Photoimmunology & Photomedicine, 28: 34–41. doi: 10.1111/j.1600-0781.2011.00633.x
Dr Bouchard has a potential conflict as CEO and President of the Sinclair Research Center, LLC which offers these types of studies to clients.
- Issue published online: 28 DEC 2011
- Article first published online: 28 DEC 2011
- Manuscript Accepted: 21 SEP 2011
This study determined the threshold doses for ‘solar erythema’ and for phototoxic responses to 8-methoxypsoralen (8-MOP) in white skin Hanford and grey skin Yucatan miniature swine.
For threshold erythema determinations, the UVR exposures included both UVA (315–400 nm) and UVB (290–315 nm) radiation by positioning one fluorescent ‘sunlamp’ among 10 ‘PUVA’ lamps. With this configuration the UVR exposures ranged from 0.5–2.8 times the ‘instrumental MED’ (MEDi) for Hanford and from 1.0–5.6 times the MEDi for Yucatan. For phototoxicity determinations (i.e., with and without topically-applied graduated concentrations of 8-MOP), the UVB component was minimized by extinguishing the sunlamp, thus permitting higher UVA exposures.
The Hanford had the lower UV erythema dose threshold (1.0–1.4 times the MEDi) and the erythema that developed was readily observable. The exposure doses for the phototoxicity test were 5 J/cm2 of UVA in 35 minutes or 10 J/cm2 in 70 minutes. The phototoxic (vascular) response to 8-MOP was observed in the two highest concentrations (0.01% and 0.1%) in Hanford pigs, in a dose-related manner. Microscopic evidence of a dose-related response was also observed as the concentration of 8-MOP increased.
This verified that the Hanford miniature swine is the preferable strain for phototoxic effects. In contrast, UVR exposure of the Yucatan pig skin produced tanning rather than erythema, confirming that the Yucatan is the more appropriate strain for studying the melanization response. Thus, Hanford and Yucatan miniature swine have cutaneous photobiological responses that reflect their respective strain differences.