A modifying influence of ortho-cresol (o-cresol) on the carcinogenic effect of benzo(a)pyrene (BaP) with combined oral administration to CC57Br mice had been found. During simultaneous administration of o-cresol (1 mg) and BaP (1 mg), the incidence of tumors, the multiplicity of tumors, and the degree of malignancy all increased, but the latency was shortened. When o-cresol was administered before or after BaP (in identical doses), the carcinogenic effect was weakened. When o-cresol (10 mg) and BaP (5 mg) were administered simultaneously, the incidence of malignant tumors was similar to controls receiving BaP only (13.8%), indicating inhibition of carcinogenesis.
Objective: We assessed a probable role of pesticides as generalized products of plant protection means in the formation of the hormone-dependent oncological incidence in the population. Materials and methods: In the work we analyzed the territorial features of plant protection chemicals use and the population endocrine cancer incidence data (breast and thyroid cancer in men and women, prostate cancer in men, ovarian and uterine cancer in women, calculated according to the Ukrainian standard) based on the materials from National Cancer Registry of Ukraine. Results: Territorial dependences between gross indicators of the used chemical protection means, rates of their increase in the agriculture and indicators of the population endocrine cancer incidence were revealed. The most intensive growth was shown to be observed in the regions with a predominantly agricultural mode of production. The performed linear regression analysis confirmed a direct strong correlation between the volume of pesticide at the household use and the incidence of ovarian cancer (r = 0.89; p>0.01) and prostate cancer (r = 0.87; p>0.01). Conclusion: Although the results of the analytical consideration of the problem and the data of linear-regression analysis indicate a possible role of pesticides in the induction of endocrine cancer, further research is needed in this field. In the future, it is important to consider the problem by classes and groups of pesticides with the possibility of the approach to the definition of the effect mechanisms.
The aim: of this work was to experimentally study the modifying role of toxic substances (phenol) in the manifestation of genotoxic and immunological changes in the body
when exposed to a carcinogen (benzo[a]pyrene).
Materials and methods: Investigations were carried out in the chronic experiment on white random-bred male mice. Genotoxic (micronucleus test), immunologic and
pathomorphological methods were used.
Results: As a result of the experiment on white outbred mice during the isolated peroral administration of benzo[a]pyrene (a single dose of 0.1 mg) and in combination with
phenol (single doses of 0.1 mg; 0.002 mg) a carcinogenic effect (forestomach papillomas) has been established as well as general patterns of the manifestation of genotoxic and
immunological changes regarding carcinogenesis and their dependence on the dose and duration of the administration of the substances in the early stages of the experiment.
The established patterns involved parallelism of development and unidirectionality of the genotoxic effect (increasing of micronucleus incidence) and suppression of the T-cell immunity by the end of the month as well as reliable negative correlation between them.
Conclusions: It has been established that phenol has a modifying effect on carcinogenesis, which was shown as an increase in the micronuclei frequency, intensification of immunosuppression in the early stages and an increase in the multiplicity factor of the development of forestomach tumors.
* Роботу виконано в межах планової наукової тематики ДУ «Інститут громадського здоров'я ім. О. М. Марзєєва НАМН України» «Територіальні особливості поширеності ендокринної та гормонозалежної онкопатології і роль хімічних канцерогенів атмосферного повітря у її формуванні» (державний реєстраційний № 0118U003701). Установою, що фінансує дослідження, є НАМН України. Автори гарантують повну відповідальність за все, що опубліковано в статті. Автори гарантують відсутність конфлікту інтересів і власної фінансової зацікавленості при виконанні роботи та написанні статті. Рукопис надійшов до редакції 14.05.2019.
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