title: [Tumors in BALB C mice after transplacental exposure to N-nitrosoethylurea in progenesis].
abstract: In the experiments with transplacental exposure of mice to N-nitrosoethyl urea (NEU) an enhanced carcinogenesis was noted not only in the first but also in the second generation. This effect in mice of the second generation was manifested in earlier development, as compared with control animals, of different neoplasms as well as in somewhat increased frequency of their detection. Postnatal exposure to NEU would enhance carcinogenesis in mice of both experimental and control groups, whereas no enhancement of carcinogenesis was observed in animals exposed to NEU in progenesis, compared with control mice. Postnatal x-ray irradiation also failed to produce enhanced carcinogenesis, compared with control animals i.e. those exposed to NEU in progenesis. While in female mice of the same group, contrary to the control, ovarian tumors under the effect of irradiation did not arise. It is suggested that there is a pathogenic connection between the inheritance of carcinogenic effect by oocytes and the loss by the ovary its capacity to produce neoplasms in response to irradiation.
mesh_terms: D000230:Adenocarcinoma / Q000139:chemically induced; D000232:Adenofibroma / Q000139:chemically induced; D000236:Adenoma / Q000139:chemically induced; D000818:Animals; D005038:Ethylnitrosourea / Q000009:adverse effects*; D005260:Female; D005333:Fetus / Q000187:drug effects*; D007984:Leydig Cell Tumor / Q000139:chemically induced; D008175:Lung Neoplasms / Q000139:chemically induced; D008297:Male; D008325:Mammary Neoplasms, Experimental / Q000139:chemically induced; D008431:Maternal-Fetal Exchange; D051379:Mice; D008807:Mice, Inbred BALB C; D009374:Neoplasms, Experimental / Q000139:chemically induced / Q000235:genetics*; D009607:Nitrosourea Compounds / Q000009:adverse effects*; D011247:Pregnancy; D013736:Testicular Neoplasms / Q000139:chemically induced
chemical_list: D009607:Nitrosourea Compounds; D005038:Ethylnitrosourea
vernacular_title: Opukholi u mysheĭ BALB/c posle transplatsentarnogo vozdeĭstviia N-nitrozoetilmocheviny v progeneze.