تأثیر داروی Selegiline بر محور هیپوفیز- گناد و تغییرات بافتی بیضه در موش های صحرایی نر بالغ

Selegiline is an inhibitor of B-Mono amino oxidase (MAO-B). In view of its usages in treatment of nervous illnesses such as Parkinson’s, Alzheimer’s and  depression the side effects of selegiline on the endocrine axises are very important. In this research the effect of selegiline on pituitary- gonad axis and    spermatogenesis in adult male rats were studied. For experimental and control groups 32 adult male rats from wistar race were divided into 4 groups of 8. The experimental groups (B,C,D) were given oral doses of 5,10,15 (mg/kg.B.W) selegiline for the period of 30 days and the control group (A) received saline. The blood samples were taken 8 hour after receiving last dose at 30th day and the concentration of LH, FSH and testosterone was measured by RIA. In adition at the 30th day the testes were separated and histological changes was studied among experimental and control groups. The results were evaluated by using ANOVA and Duncan test.  The statistical analysis of the results indicated that receiving different dosages of selegiline showed a significant increase in concentration of LH hormone in comparison with control group, but concentration of FSH did not show significant difference compared to the control group. In addition concentration of testosterone in response to different dosages in relative to the control group    showed a significant decrease. According to the results we suggest that through LH increase, selegiline causes a decrease in concentration of testosterone via down-regulation receptors on leydig cells. Furthermore selegiline causes increase in dopamine concentration in striatum area as an inhibitor of MAO-B and intern causes decrease in concentration of prolactin. The decrease in prolactin secretion reduce the effect    of LH hormone on leydig cell. In addition histological studies showed a significant effects caused by selegiline such as decreased number of spermatozoa in seminiferous tubules, leydig cells and reduced spermatogenesis, and these effects were dose dependent.