Does erectile tissue angioarchitecture modify with aging? An immunohistological and morphometric approach

Area of Science:

• Urology
• Andrology
• Vascular Biology

Background:

• Erectile dysfunction (ED) is prevalent in aging men, but age-related changes in penile vascular structure are not fully understood.
• Understanding these changes is crucial for developing effective ED treatments.

Purpose of the Study:

• To investigate age-related morphologic, immunohistological, and morphometric alterations in rat penile cavernosal tissue.
• To quantify changes in vascular spaces and smooth muscle cell (SMC) areas during aging.

Main Methods:

• Male Wistar rats aged 2, 6, 12, 18, and 24 months were studied (N=5 per group).
• Cavernosal tissues were analyzed for morphology, alpha-smooth muscle actin, von Willebrand factor, and quantified for vascular and SMC areas using ImageJ.

Main Results:

• Penile angioarchitecture remained similar across age groups, with sinusoidal vascular spaces surrounded by SMCs.
• Aging led to a significant reduction in SMC content and an increase in vascular lumen caliber.
• Vascular area increased approximately 3.5-fold from 2 to 6 months and further with age, while SMC area decreased by approximately 1.5-fold in older rats.

Conclusions:

• Penile cavernosal angioarchitecture undergoes significant modifications with aging.
• Reduced SMCs and enlarged vascular lumens are key age-related changes.
• These vascular alterations may compromise the functional capacity of the penile vascular tree in elderly individuals.