Document Detail

Broad-spectrum sunscreens prevent the secretion of proinflammatory cytokines in human keratinocytes exposed to ultraviolet A and phototoxic lomefloxacin.
MedLine Citation:
PMID:  16900948     Owner:  NLM     Status:  MEDLINE    
The combination of phototoxic drugs and ultraviolet (UV) radiation can trigger the release of proinflammatory cytokines. The present study measured the ability of sunscreens to prevent cytokine secretion in human keratinocytes following cotreatment of these cells with a known photoreactive drug and UVA. Keratinocytes were treated for 1 h with increasing concentrations of lomefloxacin (LOM) or norfloxacin (NOR), exposed to 15 J/cm2 UVA, and incubated for 24 h. NOR, owing to the absence of a fluorine atom in position 8, was non-phototoxic and used as a negative control. Cell viability and the release of 3 cytokines were assessed, namely interleukin-1alpha (IL-1alpha), interleukin-6 (IL-6), and tumour necrosis factor-alpha (TNF-alpha). The measurement of these cytokines may be a useful tool for detecting photoreactive compounds. To measure their ability to prevent cytokine secretion, various sunscreens were inserted between the UVA source and the cells. Treatment with NOR, NOR plus UVA, or LOM had no effect on the cells. LOM plus UVA, however, had an effect on cell viability and on cytokine secretion. IL-1alpha levels increased with LOM concentration. The release of TNF-alpha and IL-6 followed the same pattern at lower concentrations of LOM but peaked at 15 micromol/L and decreased at higher concentrations. Sunscreens protected the cells from the effects of LOM plus UVA, as cell viability and levels of cytokines remained the same as in the control cells. In conclusion, the application of broad-spectrum sunscreen by individuals exposed to UVA radiation may prevent phototoxic reactions initiated by drugs such as LOM.
P Reinhardt; M Cybulski; S M Miller; C Ferrarotto; R Wilkins; Y Deslauriers
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Canadian journal of physiology and pharmacology     Volume:  84     ISSN:  0008-4212     ISO Abbreviation:  Can. J. Physiol. Pharmacol.     Publication Date:  2006 Feb 
Date Detail:
Created Date:  2006-08-11     Completed Date:  2006-08-25     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0372712     Medline TA:  Can J Physiol Pharmacol     Country:  Canada    
Other Details:
Languages:  eng     Pagination:  221-6     Citation Subset:  IM    
Lasers and Electro-Optics Division, Consumer and Clinical Radiation Protection Bureau, Product Safety Program, Healthy Environments and Consumer Safety Branch, Health Canada, Ottawa, ON K1A 1C1, Canada.
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MeSH Terms
Cell Survival / drug effects,  physiology,  radiation effects
Cells, Cultured
Cytokines / antagonists & inhibitors,  radiation effects,  secretion*
Dermatitis, Phototoxic / prevention & control
Dose-Response Relationship, Drug
Dose-Response Relationship, Radiation
Fluoroquinolones / toxicity*
Inflammation Mediators / antagonists & inhibitors*,  metabolism,  radiation effects
Keratinocytes / drug effects*,  radiation effects,  secretion
Quinolones / toxicity*
Sunscreening Agents / pharmacology*
Ultraviolet Rays / adverse effects*
Reg. No./Substance:
0/Cytokines; 0/Fluoroquinolones; 0/Inflammation Mediators; 0/Quinolones; 0/Sunscreening Agents; 98079-51-7/lomefloxacin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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