نبذة مختصرة : Background: Androgen deficiency is the most common disorder of reproductive function and can lead to male sexual disorders. Objective: This study was designed to evaluate the androgenic effects of Pycnanthus angolensis (Welw.) Warb in hemicastrated rats. Materials and methods: Forty-two male rats were divided into 6 groups of 7 rats each, including a group of uncastrated rats that received distilled water (10 ml/kg); a group of castrated rats that received 10 ml/kg of distilled water; a group of castrated rats that received testosterone enanthate (3 mg/kg BW) per week intramuscularly; and 3 groups of castrated rats that received 43, 86 and 172 mg/kg of the aqueous extract of Pycnanthus angolensis, respectively. After 14 days of oral treatment, the rats were killed by decapitation. The blood was collected and the androgen-dependent organs were collected for histological sectioning, and biochemical analysis. The tail of the epididymis was used to assess sperm quality. Results: Treatment with the aqueous extract at doses of 43 and 86 mg/kg, significantly improved the sexual behavior of castrated rats, with increases of 25.92% and 22.74% intromissions frequency, and 67.06% and 56.46% mount frequency, compared to those in the castrated rats which did not receive any treatment. The extract also enhanced sperm quality in castrated rats. Both doses also significantly increased serum testosterone levels with rates of 45.07% and 49.00%, respectively; compared to those in the negative control group. Conclusion: In view of the aforesaid results, Pycnanthus angolensis (Welw.) Warb could be considered as a promising natural agent in hypogonadism management. Keywords: Androgen, hypogonadism, castrated male rats, unilateral castration, Pycnanthus angolensis (Welw.) Warb
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