Lamina Propria Collagen Architecture in Interstitial Cystitis/Bladder Pain Syndrome

Area of Science:

• Urology
• Pathology
• Biochemistry

Background:

• Interstitial cystitis/bladder pain syndrome (IC/BPS) is a complex condition with unknown causes.
• Understanding bladder tissue characteristics may reveal IC/BPS pathophysiology.

Purpose of the Study:

• To investigate bladder collagen differences in IC/BPS patient subgroups.
• To correlate collagen characteristics with IC/BPS phenotypes.

Main Methods:

• Bladder biopsies from 30 IC/BPS patients and 14 controls were analyzed.
• Tissue sections were stained and collagen assessed using hematoxylin and eosin, picrosirius red, and CT-FIRE software.
• Patients were subgrouped by Hunner lesions (HL) and bladder capacity (BC).

Main Results:

• IC/BPS patients showed significantly lower lamina propria collagen density compared to controls.
• HL subgroup exhibited increased peri-muscular collagen, inflammation, and narrower fibers.
• Non-low BC patients had reduced collagen density and straighter fibers; low BC patients had narrower fibers.

Conclusions:

• Diminished collagen density in the bladder lamina propria is a key feature of IC/BPS.
• Distinct collagen profiles exist across IC/BPS subgroups (HL, non-low BC, low BC).
• These collagen alterations suggest a destructive and redistributive process contributing to IC/BPS pathogenesis.