The article presents data showing the effect of environmental factors on the prevelence of autoimmune disorders, the example of alopecia areata. The results of mathematical modeling of the formation of this dermatosis prevalence depending on the content of zinc, copper, nickel, chromium and lead in the environment were described. It was found that an increase in the content of these metals in the soil increases the likelihood of the formation of high levels of incidence of alopecia areata. However, the content of the same metals in the air has no effect on the formation of prevelence of this autoimmune skin disease. Using data on the content of zinc, copper, nickel, chromium and lead in the soil developed logit-model allows us to predict the prevalence rates of alopecia areata and make appropriate management decisions.

Goal. To study and analyze the relationship of autoimmune diseases of the skin to sex and age. Materials and methods. Study of the relationship of autoimmune of skin diseases to sex and age was performed using contingency table analysis methods, which included the implementation of Pearson x2 to test the hypothesis of independence of the two nominal attributes, calculation of standardized residual values, mapping the relevant category attributes using the method of correspondence analysis, calculation of coefficients of communication Pearson, Chuprova and Kramer. Differences were recognized to be statistically significant at the observed level of significance p < 0,05. In the analysis of standardized residuals were established the following conditions: if the absolute value of the standardized residuals ≥ 2, it was considered that the differences between the observed and expected frequencies are statistically significant at the 0,05 level, if standardized residue ≥ 2,6 the differences are significant at 0,01, if the residue standardized ≥ 3,3 the differences are significant at the 0,001 level. Results. Autoimmune skin diseases linked to sex and age of patients. Vitiligo is associated with male sex, localized scleroderma with women. Sex as a biological factor does not affect the appearance of alopecia areata, lupus erythematosus and bullous dermatosis. Age has in general a greater influence on the formation of autoimmune dermatoses. Alopecia areata is associated in the age period 0-14 and 30-44 years, vitiligo with age period 18-29 years, bullous dermatosis linked to the age group 60 years and older. Conclusion. Sex and age have a differential impact on the formation of autoimmune dermatoses, as biological risk factors of their formation.

In the model experiment on C57BL /6 mice there were established features of the impact of heavy metals and chelators of essential metals on proliferation and apoptosis of epithelial skin cells (keratinocytes). For the execution of a study 40 test animals were divided into seven experimental and 1 control groups, each consisted of five animals. The proliferative and apoptotic activity of keratinocytes was determined by the immunohistochemical method and evaluated by calculating the proliferation index and the index of apoptosis in the cells of the surface epithelium and the epithelial cells of hair follicles in the late anagen stage. Comparative analysis of the proliferation index of the control group and experimental groups showed administration of zinc sulfate, sodium dichromate and zinc chelator (N, N, N`, N`-tetrakis (2-pyridylmethyl) ethylenediamine) to animals to give rise in a statistically significant increase in the proliferative activity of keratinocytes. The decline of proliferation index was detected in animals treated with lead acetate and copper chelator (ammonium tetrathiomolybdate). Introduction of an iron chelator (deferoxamine) had no effect on the proliferative activity of keratinocytes in experimental animals. Induction of apoptosis of epithelial cell was noted under the administration of nickel sulfate, sodium dichromate, lead acetate and zinc chelator (N, N, N`, N`-tetrakis (2-pyridylmethyl) ethylenediamine) to animals. In mice received deferoxamine zinc sulfate and apoptotic activity of keratinocytes has not changed. The use of cluster analysis allowed to classify substances administered to experimental animals, taking into account their simultaneous effect on the studied cellular processes. Lead acetate, iron chelator (deferoxamine) and copper chelator (ammonium tetrathiomolybdate) were shown to reduce the proliferative activity of keratinocytes and have little effect on apoptosis of the epithelial cells of the skin. Zinc sulfate, nickel sulfate, sodium dichromate and zinc chelator (N, N, N`, N`-tetrakis (2-pyridylmethyl) ethylenediamine) activate cell proliferation and induce apoptosis of keratinocytes.

No abstract