Influência da distrofia muscular do Golden Retriever (GRMD) na viabilidade espermática e nas características morfológicas do aparelho reprodutivo masculino / Influence of Golden Retriever muscular dystrophy (GRMD) on sperm viability and on morphologic characteristics of the male reproductive tract

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

Muscular dystrophies constitute a group of diseases characterized by progressive and irreversible muscle degeneration. Duchenne´s Muscular Dystrophy (DMD) is a lethal myopathy caused by dystrophin deficiency, a muscular cell cytoskeleton protein. The dystrophin gene have recessive characteristic and is located in the p21 portion of the X chromosome. Advancements in the therapeutic cares of the affected by the DMD have been increasing their life expectancy and quality. For this motive, physiologic and/or ethics questions, like reproductive means of these patients, began to be discussed. Animal models are very useful in drawing parallels between morphologic and physiologic findings, predictions and treatments of diseases that affect man. The Golden Retrievers Muscular Dystrophy (GRMD) is a natural disease of this race, being the best animal model for DMD studies, since it presents similar physiopathology. The aim of this study was to investigate the existence of possible morphological alterations of the male reproductive tract and their connection with the sperm qualities of these dogs. For so, thirty seven ejaculates from 5 GRMD affected dogs and 4 non-affected Golden Retrievers were collected monthly and evaluated in five different replicates. After routine spermogram, the acrosome integrity (FITC-PSA), the mitochondrial activity (JC-1) and the DNA structure (SCSA) were evaluated by flow cytometry technique. The resistance to the oxidative stress was measured by the TBARS dosage. Fragments of testicle and epididymis of five GRMD affected animals and 1 healthy animal were collected for histological evaluation. No significant difference were found in seminal evaluations (p>0,05) between affected and control groups, though significant alterations have been seen in the histological evaluations of all the analyzed cloths. This animal model suggests that ejaculates of DMD men can be obtained by the proper stimulation, and that the conventional in vitro fertilization techniques combined with pre-implantation genetic diagnosis for single gene disorders may be efficient to satisfy the desire of paternity of DMD patients with the birth of non-affected children.

ASSUNTO(S)

dmd dmd andrologic evaluation distrofia muscular grmd avaliação andrológica grmd testicle testículo muscular dystrophy

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