Nonbacterial prostatitis caused by partial urethral obstruction in the rat.

Area of Science:

• Urology
• Experimental Pathology
• Animal Models

Background:

• The exact cause of nonbacterial prostatitis (NBP) remains unclear, largely because suitable experimental models are lacking.
• Understanding NBP pathogenesis is crucial for developing effective treatments.

Purpose of the Study:

• To establish a novel experimental model for studying nonbacterial prostatitis (NBP) in rats.
• To investigate the role of lower urinary tract obstruction and intraprostatic urinary reflux in NBP development.

Main Methods:

• A partial urethral obstruction (PUO) model was created in male Wistar rats using a nylon ligature.
• Histological analysis was performed at various time points after PUO and after obstruction release.
• Bladder instillation with different molecular weight tracers (lucifer yellow, microperoxidase, HRP) was used to assess urinary reflux into prostatic tissue.

Main Results:

• PUO induced inflammatory changes in the prostate, including lymphocytic infiltration and interstitial edema, peaking on day 3.
• These inflammatory changes resolved after the release of the PUO.
• Low-molecular-weight tracer (lucifer yellow) was observed within the prostatic stroma, indicating urinary reflux.

Conclusions:

• Lower urinary tract obstruction can induce nonbacterial prostatitis (NBP) in a rat model.
• Intraprostatic urinary reflux, particularly of low-molecular-weight substances, is a potential etiologic factor in NBP.