Effects of Nitric Oxide on the Induction of Experimental Allergic Orchitis in Guinea Pig

  • An, Jeong Hwan (Department of Urology, Kosin University College of Medicine) ;
  • Kim, In Keun (Department of Urology, Kosin University College of Medicine) ;
  • Kim, Taek Sang (Department of Urology, Kosin University College of Medicine) ;
  • Kwak, Hyun Jeong (Genomic Research Center for Immune Disorders and Department of Microbiology and Immunology, Wonkwang University School of Medicine and of Wonkwang University) ;
  • Rhew, Hyun Yul (Department of Urology, Kosin University College of Medicine) ;
  • Chung, Hun-Taeg (Genomic Research Center for Immune Disorders and Department of Microbiology and Immunology, Wonkwang University School of Medicine and of Wonkwang University)
  • Published : 2004.06.30

Abstract

Background: Production of nitric oxide (NO) by inducible NO synthase (iNOS) has been implicated in the pathology of autoimmune disease. It is unknown whether iNOS expression is increased within testes and whether iNOS and NO have essential roles in the pathogenesis of EAO. Methods: EAO was induced in guinea pig testes at 17 days after secondary immunization by administration of crude extract (CE) and purified glycoprotein 1 (GP1) from normal guinea pig testes. iNOS gene expression was assessed by RT-PCR and Northern blot analysis in testes. Localization of iNOS and Mac-1 and the indicator of NO-mediated tissue injury, nitrotyrosine, were detected in the testicular lesion by immunohistochemistry. Results: In control testes, inflammation and iNOS gene expression were not detected, whereas, in CE- and GP1-injected testes, inflammation and marked iNOS gene expression were evident at day 17 after secondary immunization. Immunohistochemistry of Mac-1 showed the colocalization with iNOS protein and nitrotyrosyl proteins in intertubules, suggesting that NO produced by infiltrated macrophages may be involved in inflammatory lesions of intertubules. Intraperitoneal administration of aminoguanidine significantly prevented EAO with reduction of inflammation, iNOS expression and nitrotyrosine formation. Conclusion: These results suggest that NO production by macrophages may be important in the pathogenesis of CE- and GP1-induced EAO. Furthermore, this study demonstrated the therapeutic potential of iNOS inhibitor in the treatment of inflammatory and autoimmune mediated-diseases.

Keywords

References

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