Estimating the effectiveness of protection against UV radiation with extracts of lichen Hypogymnia physodes in biological systems in vivo

The reactivity of biological systems to UV-A/B and the photoprotective potential of skin applications of lichen extracts Hypogymnia physodes according to the biochemical parameters of blood and morphometric parameters of the skin were evaluated in vivo in laboratory mice. Ethanol, acetone and hexane–acetone extracts (1 % in dimethylsulfoxide) effectively absorb the UV range inducing the most erythema. On the 4th day after UV-A/Вirradiation, severe brown burns of the back skin, severe erythema and edema, scab formation were observed. In serum, there were significantly changed biochemical parameters – the prooxidant capacity, the level of nitrate/nitrite-ions NOx, advanced oxidation protein products AOPP, glutathioneperoxidase activity GPx increased, the level of SH-groups reduced. Solutions of extracts (5 %) in dimethylsulfoxide at
a different degree exhibited the photoprotective effect: morphologically – in minimizing the burn symptoms of the skin (edema, erythema, scab); biochemically – in the regulation of these parameters at the control level. According to the set of biochemical and morphometric parameters, the most promising photoprotectors were acetone extracts. The prooxidant capacity, GPx, AOРР (in all cases reduced) and NOx showed a non-specificity and rather high sensitivity and are more suitable for estimating inflammatory and oxidative processes. The highest efficiency and the adequacy to the tasks and the specifications are shown by the level of protein SH-groups.

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