An Unusual Case of Metastatic Seminoma in a Dog

MicroRNA as epigenetic regulators of canine cryptorchidism

Cryptorchidism, the failed descent of one or both testes into the scrotum, is a common developmental disorder in male dogs. Cryptorchidism may affect canine fertility, reducing the quality of the semen, and may promote spermatic cord torsion and onset of neoplasia. MicroRNAs (miRNAs) are epigenetic regulators of gene expression and their dysregulation is associated with disorders of spermatogenesis and testis neoplasia. The present study aimed at investigating the expression of miRNAs in formalin-fixed, paraffin-embedded (FFPE) canine retained testes and testes affected by seminoma, and at integrating miRNAs to their target genes. Forty testicular FFPE specimens from 30 dogs were included - 10 scrotal and 10 contralateral retained from 10 unilateral cryptorchid dogs; 10 tumoral testes affected by seminoma from non-cryptorchid dogs; 10 scrotal normal testes from non-cryptorchid dogs included as the control. The expression level of three miRNAs, namely miR-302c-3p, miR-302a-3p, and miR-371-3p, associated with testicular disorders, were quantified using RT-qPCR. The comparative analysis demonstrated that the level of miR-302a-3p and miR-371a-3p were quantifiable exclusively in control testes. The expression level of miR-302c-3p was higher in the control than in the other groups; its expression decreased in retained testes compared to scrotal testes and testes with seminoma. Gene Ontology analysis pointed out that these miRNAs may be involved in the modulation of estrogen and thyroid hormone signaling pathways. In conclusion, this study demonstrated that miRNAs are dysregulated in canine cryptorchid and seminoma-affected testes compared to control tissues, confirming the pivotal role of miRNAs in cryptorchidism.

Metástase de seminoma em região orbital em cão - relato de caso

RESUMO O seminoma é uma neoformação testicular originária de células germinativas de ocorrência comum em cães, com maior prevalência em animais senis. Em geral, o comportamento biológico do seminoma canino é benigno. Relata-se neste trabalho um caso de seminoma com metástase em região orbital em um cão com 14 anos de idade. O animal foi atendido com queixa de aumento de volume em órbita esquerda, com posterior detecção de nódulo testicular. A punção aspirativa por agulha fina da massa orbital sugeriu tratar-se de linfoma de alto grau, contudo o diagnóstico definitivo de seminoma difuso foi estabelecido pela avaliação histopatológica, a qual revelou tratar-se de neoplasia maligna pouco diferenciada, sendo o diagnóstico de seminoma difuso confirmado pelo exame imunoistoquímico. Relatos de seminomas metastáticos em cães são incomuns. Objetivou-se com este trabalho relatar um caso de seminoma anaplásico difuso em cão cujo foco principal de metástase ocorreu em região orbital, além de descrever e discutir as dificuldades diagnósticas encontradas.