Evaluation of the effects of chronic stress applied from the prepubertal to the adult stages or only during adulthood on penile morphology in rats

• Published in: Stress (Amsterdam, Netherlands) Netherlands), 2019-03, Vol.22 (2), p.248-255
• Main Authors: Ribeiro, Carina Teixeira, Costa, Waldemar Silva, Sampaio, Francisco José Barcellos, Pereira Sampaio, Marco Aurélio, de Souza, Diogo Benchimol
• Format: Article
• Language: English
• Subjects: Animals; Immobilization; Male; Muscle, Smooth - pathology; Penis - pathology; Rats; Sexual Maturation - physiology; Stress, Psychological - blood; Stress, Psychological - pathology; Testosterone - blood
• ISSN: 1025-3890; 1607-8888
• DOI: 10.1080/10253890.2018.1553946

The present study aimed to evaluate the effects of chronic stress from the prepubertal to the adult stages or during adulthood on penile morphology in rats. The animals were immobilized in a cylinder for 2 h daily for a total of six weeks to simulate stress. Ten rats were exposed to stress stimulus beginning from the prepubertal age, while nine rats were exposed to stress stimulus only during adulthood. Animals were killed at 24 h after the last stress session for short-term evaluation (SP-S and SA-S), while other age-matched rats were sacrificed at 6 weeks after the last stress session for long-term evaluation (SP-L and SA-L). Age-matched animals were used as controls (CP-S, CA-S, CP-L and CA-L). After treatment, serum testosterone levels and areas of cavernosum structures were evaluated. We observed no changes in serum testosterone levels after stress treatment. Results revealed that the area of the corpus cavernosum without the tunica albuginea in animals in the SA-S group was 16% lower than that in the CA-S group. The smooth muscle was 31% lower in the SP-L group than in the SP-S group and 42% lower in the SA-S group than in the CA-S group. The elastic fiber system was 48% lower in the SP-L group than in the CP-L group and 59% lower in the SA-S group than in the CA-S group. Chronic stress promoted morphological changes in the rat penis and was significantly more pronounced when the stress occurred throughout the adulthood. Chronically applied single stress stimulus caused greater damage to the penis when induced directly during adulthood than when introduced before puberty to adulthood and could be associated with erectile dysfunction.