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The resistin is an insulin-antagonizing factor that also plays a regulatory role in inflammation, immunity, food intake, and gonadal function. Although adipose tissue is the primary source of resistin, it is also expressed in other tissues, including the testis. This study was aimed to investigate the immunohistochemical (IHC) localization of resistin in testicular tissues of Holstein bulls. Mouse monoclonal antibody anti-resistin as primary antibody and rabbit anti-mouse IgG Horseradish Peroxidase (HRP) as secondary antibody were used. Samples of testis were collected from four bulls aged of 1.5 to 2 years old, and preserved in 10% formalin for posterior inclusion in paraffin. Histological sections with 5 micron in thickness were prepared for IHC. Immunoreactions were assessed for spermatogenic cells, Leydig cells, Sertoli cells and epididymis. Our results showed that the resistin is expressed in the testis. Immunoreactions were observed in Sertoli cells, Leydig cells, spermatogonia cells and cytoplasm of ciliated cells of the epididymis. But, the intensity of staining in Leydig cells and epididymis was very weak in comparison with other cells. Probably, resistin had autocrine effect in testis, therefore it could be involved in spermatogenesis and sperm motility.

Expression of resistin in testis and epididymis of bulls