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Vet Pathol ; 56(6): 848-855, 2019 11.
Artigo em Inglês | MEDLINE | ID: mdl-31526125

RESUMO

MicroRNAs (miRNAs) are a class of small, noncoding RNA that post-transcriptionally regulate protein expression. miRNAs are emerging as clinical biomarkers of many diseases, including tumors. The aim of this study was to investigate whether miRNA expression could vary in melanoma samples derived from formalin-fixed, paraffin-embedded (FFPE) tissues. The study included 4 groups: (1) 9 samples of oral canine malignant melanoma, (2) 10 samples of cutaneous malignant melanoma, (3) 5 samples of healthy oral mucosa, and (4) 7 samples of healthy skin. The expression levels of 6 miRNAs-miR-145, miR-146a, miR-425-5p, miR-223, miR-365, and miR-134-were detected and assessed by quantitative reverse transcription polymerase chain reaction (RT-qPCR) using TaqMan probes. Cutaneous canine malignant melanoma showed a decrease of the expression level of miR-145 and miR-365 and an increase of miR-146a and miR-425-5p compared to control samples. MiR-145 was also downregulated in oral canine malignant melanoma. The miRNAs with decreased expression may regulate genes involved in RAS, Rap1, and transforming growth factor ß (TGF-ß) signaling pathways, as well as upregulated genes associated with phosphatidylinositol signaling system, adherens junction, and RAS signaling pathways. In conclusion, miR-145, miR-365, miR-146a, and miR-425-5p were differentially expressed in canine malignant melanoma and healthy FFPE samples, suggesting that they may play a role in canine malignant melanoma pathogenesis.


Assuntos
Biomarcadores Tumorais/genética , Doenças do Cão/diagnóstico , Regulação Neoplásica da Expressão Gênica/genética , Melanoma/veterinária , MicroRNAs/genética , Neoplasias Bucais/veterinária , Neoplasias Cutâneas/veterinária , Animais , Estudos de Coortes , Doenças do Cão/patologia , Cães , Regulação para Baixo , Imuno-Histoquímica/veterinária , Melanoma/diagnóstico , Melanoma/patologia , Neoplasias Bucais/diagnóstico , Neoplasias Bucais/patologia , Inclusão em Parafina/veterinária , Reação em Cadeia da Polimerase em Tempo Real/veterinária , Neoplasias Cutâneas/diagnóstico , Neoplasias Cutâneas/patologia , Regulação para Cima , Melanoma Maligno Cutâneo
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