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PubMed2001

Evaluation of the inhibitory activity of topical indomethacin, betamethasone valerate and emollients on UVL-induced inflammation by means of non-invasive measurements of the skin elasticity.

BACKGROUND/AIM: Topical indomethacin has been reported to inhibit ultraviolet light-induced erythema. The objective of this study was to verify this assertion and to compare indomethacin 10% ointment to beta-methasone valerate 0.1% ointment, water-in-oil emulsion and oil-in-water emulsion by means of non-invasive skin elasticity measurements. METHODS: Products were applied on the back skin 60 min and 5 min before and 5 min after UVL irradiation. Untreated test sites served as controls. Clinical evaluation, measurements of epidermal hydration (Corneometer) and mechanical properties of the skin (Cutometer) were made 1 h before and 24 h after exposure. RESULTS: Test areas treated with indomethacin 60 min and 5 min before irradiation showed the significantly lowest visual erythema scores and no significant changes in skin mechanical parameters. At all other test sites, a significant decrease in elasticity parameters (Ue, Ur, Ua/Uf, Ur/Uf) and an increase in viscoelasticity parameters (Uv, Uv/Ue) of the skin were observed. No significant changes of epidermal hydration were found at any of the test sites. CONCLUSION: The inhibitory action of topical indomethacin on UVL-induced inflammation is superior to beta-methasone valerate and emollients. Non-invasive measurement of skin elasticity could be used as a supplementary tool for objective evaluation and comparison of the photoprotective activity of different topical agents.

Administration, Topical↗
PubMed2000

Retinal maturation is delayed by repeated, but not single, maternal injections of betamethasone in sheep.

PURPOSE: The safety and efficacy of prescribing a single maternal course of corticosteroid during pregnancy has been documented in human trials. However, the current trend is to prescribe repeated courses of corticosteroid. We investigated an aspect of the safety of this practice in an animal model. METHODS: Date-mated ewes received saline, single or four corticosteroid injections between days 104 and 124 of gestation (term = 150). Lambs were delivered on day 125 or 145 by caesarian section after spinal anaesthesia. Eye diameters were measured and semi-thin toluidine-blue-stained transverse sections of retinae were analysed using an Optimus Image Analysis program. RESULTS: At 125 days, retinal measures in the ventral periphery and area centralis were significantly thinner than control (p = 0.0001). At 145 days, total eye size was significantly reduced compared with control (p = 0.03), and retinal measures in the ventral periphery (p = 0.0001), but not the area centralis (p = 0.19), remained significantly different from control. CONCLUSION: Repeated maternal administration of corticosteroid may affect retinal maturation in the fetus.

Animals↗