Experimental autoimmune prostatitis after neonatal thymectomy in the mouse

Area of Science:

• Immunology
• Urology
• Reproductive Biology

Background:

• Experimental autoimmune prostatitis (EAP) is a condition that can be induced in specific mouse models.
• Understanding the mechanisms behind EAP is crucial for autoimmune disease research.

Purpose of the Study:

• To investigate the induction of EAP in (C3H/HeMs X 129/J)F1 mice.
• To identify the critical developmental window for EAP induction via thymectomy (Tx).
• To characterize the immunological and histological features of EAP and associated autoantibodies.

Main Methods:

• Induction of EAP through neonatal thymectomy (Tx) at different ages (0, 3, or 7 days).
• Histological examination of prostate tissues to assess inflammation and secretory product loss.
• Detection and characterization of circulating autoantibodies against prostate epithelial cells (APA) using indirect immunofluorescence (IFL).
• Assessment of the role of androgens by orchidectomy (Orx) and subsequent androgen treatment.

Main Results:

• Tx at 3 days (Tx-3) induced EAP by puberty, characterized by lymphocytic infiltration and loss of secretory products, primarily in the anterior prostate lobe.
• Circulating autoantibodies against prostate epithelial cells (APA) were detected and specifically absorbed by prostate homogenates.
• EAP induction was dependent on neonatal thymectomy timing and androgen presence, as evidenced by lack of EAP in orchidectomized mice and its induction by androgen treatment.

Conclusions:

• Neonatal thymectomy at a critical window (day 3) can lead to autosensitization and the development of EAP in mice.
• The findings suggest that EAP development involves an autoimmune response to prostate-specific antigens, influenced by hormonal factors.
• This model provides insights into the pathogenesis of autoimmune diseases involving specific organ targets.