In ovo hepatocarcinogenicity of N-nitrosodimethylamine and N-nitrosodimethylamine in White Leghorn chickens

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DOI: https://doi.org/10.12681/jhvms.18884
A. KRIL
Institute of Experimental Morphology, Pathology and Anthropology with Museum, Bulgarian Academy of Sciences
A. GEORGIEVA
Institute of Experimental Morphology, Pathology and Anthropology with Museum, Bulgarian Academy of Sciences
B. NIKOLOV
University of Forestry, Faculty of Veterinary Medicine
R. PEPOVICH
University of Forestry, Faculty of Veterinary Medicine
K. HRISTOV
University of Forestry, Faculty of Veterinary Medicine
G. STOIMENOV
University of Forestry, Faculty of Veterinary Medicine
E. NIKOLOVA
National Diagnostic Veterinary Research Institute
R. PETROVA
National Diagnostic Veterinary Research Institute
J. ANANIEV
Trakia University, Faculty of Medicine
V. MANOV
University of Forestry, Faculty of Veterinary Medicine
Аннотация
Avian embryos have been gaining an increasing scientific interest as a valuable model system for the experimental cancer research that could contribute to a significant reduction of the number of laboratory animals. In the present study, the liver lesions induced by N-nitrosodimethylamine and N-nitrosodiethylamine in 15I line, White Leghorn embryos were identified and studied by routine histopathological method s. Foci of altered hepatocytes with basophilic and eosinophilic phenotype, well known as preneoplastic alterations were identified in the avian embryonal livers after in ovo exposure to both N-nitroso compounds. These studies were further extended by histopathological, haematological and biochemical examinations on the effects of N-nitrosodimethylamine in chickens hatched from carcinogen-inoculated eggs. In addition to the preneoplastic lesions observed in the avian livers, proliferations of oval and hepatocellular carcinoma cells, with clearly expressed signs of malignancy were found. The in ovo application of the chemical carcinogen was found to affect both hematological and blood biochemistry parameters measured in experimental birds. The established conditions such as thrombocytopenia and increased levels of liver enzymes, as an essential part of the paraneoplastic syndrome, were associated with the process of hepatocarcinogenesis. The results of this study confirm the preneoplastic nature of the focal lesions in embryonal avian liver and their progression to liver neoplastic alterations after a single in ovo application of known hepatocarcinogens. Moreover, the results indicate that 15I line, White Leghorn embryos are anew, valuable in ovo model for studies on hepatocarcinogenicity of chemical compounds and underline the importance of research on the development of different avian models of carcinogenicity.
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