An immunohistological study of granulomatous prostatitis

Area of Science:

• Urology
• Immunology
• Pathology

Background:

• Granulomatous prostatitis (GP) etiology is often unknown, though infections and surgery are implicated.
• It may arise from reactions to altered prostatic secretions.
• The study investigates cellular and protein markers in different forms of GP.

Purpose of the Study:

• To analyze the cellular infiltrate and protein expression in diffuse GP, focal periacinar granulomas, and focal prostatic infarcts.
• To understand the role of immune cells and prostatic products in the pathogenesis of GP.
• To explore potential mechanisms behind prostatic epithelial changes in GP.

Main Methods:

• Immunohistological techniques were employed to examine tissues.
• Macrophages, lymphocytes (T and B cells), fibrinogen, alpha 1-antitrypsin, prostatic-specific antigen (PSA), and prostatic acid phosphatase (PAP) were investigated.
• The study included 3 cases of diffuse GP, 9 of focal periacinar granulomas, and 5 of focal prostatic infarcts.

Main Results:

• T-lymphocytes and macrophages were present in both diffuse and focal GP, with scarce B-lymphocytes.
• Fibrinogen antigen was absent in granulomas but present in infarcts; alpha 1-antitrypsin was abundant in both.
• Significant reductions in PSA and PAP reactivity were observed in granulomatous prostatitis.

Conclusions:

• The presence of T-lymphocytes and macrophages suggests an immune-mediated process in GP.
• Altered PSA and PAP levels indicate damage or altered function of prostatic epithelial cells.
• Cytokines from activated immune cells likely contribute to prostatic inflammation, altered secretions, and epithelial destruction.