Increased urinary hyaluronic acid and interstitial cystitis

Area of Science:

• Urology
• Nephrology
• Biochemistry

Background:

• Interstitial cystitis (IC) is a chronic condition characterized by bladder pain and urinary urgency.
• Hyaluronic acid (HA) is a component of the bladder's epithelial lining, potentially playing a role in maintaining urothelial integrity.
• Understanding biomarkers for IC is crucial for diagnosis and management.

Purpose of the Study:

• To compare urinary hyaluronic acid (HA) levels in patients diagnosed with interstitial cystitis (IC) versus healthy female controls.
• To investigate the potential of urinary HA as a biomarker for IC.
• To explore the relationship between urinary HA and epithelial integrity in IC.

Main Methods:

• Urinary HA was quantified using a solid-phase radiometric assay.
• Samples from 17 untreated IC patients and 17 age-matched healthy controls were analyzed.
• Urinary HA concentrations were compared both directly and normalized to urinary creatinine.

Main Results:

• Mean urinary HA concentrations did not significantly differ between IC patients and controls (574 vs. 512 ng./ml., p=0.77).
• When normalized to urinary creatinine, HA levels were significantly elevated in IC patients compared to controls (674 vs. 446 ng./mg. creatinine, p=0.0019).
• Urinary creatinine levels were comparable between the two groups, indicating normalization was appropriate.

Conclusions:

• Elevated urinary hyaluronic acid, when adjusted for creatinine, suggests increased shedding or leakage of HA in interstitial cystitis patients.
• This finding may indicate compromised urothelial barrier function in IC, with HA potentially leaking from the bladder submucosa into the urine.
• Urinary HA warrants further investigation as a potential non-invasive biomarker for interstitial cystitis.