Do alterations in gene expressions influence tumorigenesis in the transmissible venereal tumor in dogs?
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Data
2020-01-01
Autores
Fêo, Haline Ballestero [UNESP]
Flórez, Luis Mauricio Montoya [UNESP]
Yamatogi, Ricardo Seiti
Duzanski, Anderson Do Prado [UNESP]
Araújo Junior, João Pessoa [UNESP]
de Oliveira, Rogerio Antonio [UNESP]
Rocha, Noeme Sousa [UNESP]
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Resumo
Canine transmissible venereal tumor (CTVT) is a transmissible neoplasm, which spreads naturally between dogs through the halogenic transfer of tumor cells, mainly during coitus. It is the oldest known tumoral lineage in nature and reports on gene mutations have been extended. Also, this tumor shares several genetic mutations with some cancers in humans, among them lung carcinomas, melanoma, prostate, breast, among other cancers. Thus, expression of tumor suppressor genes such as TP53, P21, and apoptosis-related genes such as BAX, BCL-2, and BCL-xL, both in vivo and in vitro (primary cell culture) were quantified. In the present study, the comparison of gene expression, the TP53 gene, in most cases, was shown to be high in the majority of tissues (65%) and primary cell culture (100%), while BCL-2, BCL-xL, and BAX presented variation among the animals analyzed. Moreover, in these situations, the results suggested that the apoptotic regulation of these genes did not occur for TP53. The P21 gene was shown to be mostly normal (70%); although, absence (6%) and underexpressions (24%) were also observed. Statistical analysis of the BCL-xL gene demonstrated significant differences between the tissues of the animals when compared to the cell cultures; however, to the other genes, no statistical difference was observed between the groups. Preliminarily, the results suggested the presence of alterations in the gene expressions of the TP53, P21, BAX, BCL-2 and BCL-xL leading to loss of function in these genes, which affect the tumorigenesis of CTVT.
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Palavras-chave
Apoptosis, Cancer, Cell cultures, Genetic alterations
Como citar
Ciencia Rural, v. 50, n. 11, p. 1-11, 2020.