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Seok Hyun Cho, MD; Sang Hag Lee, MD; Kyung Rae Kim, MD; Heung Man Lee, MD; Seung Hoon Lee, MD; Tae Hoon Kim, MD

Arch Otolaryngol Head Neck Surg. 2008;134(3):316-321.

Objectives  To investigate the expression and distributional patterns of the inhibitor of apoptosis protein (IAP) family and caspase 3 in nasal polyps and normal nasal mucosa and to evaluate the possible effects of the IAP family and caspase 3 on the development of nasal polyps.

Design  Prospective study.

Setting  Tertiary academic institution.

Patients  Normal inferior turbinate mucosa was obtained from 20 patients undergoing surgery for augmentation rhinoplasty. Nasal polyps were obtained from 20 patients undergoing endoscopic sinus surgery for chronic polypoid sinusitis.

Interventions  Reverse transcriptase–polymerase chain reaction, immunohistochemical analysis, and Western blot analysis were performed.

Main Outcome Measures  The expression and distribution of cIAP1, cIAP2, XIAP, survivin, and caspase 3 were evaluated in normal turbinate mucosa and nasal polyps.

Results  cIAP1, cIAP2, and XIAP were expressed in normal human nasal mucosa, where they were detected in submucosal glands, epithelial cells, vascular endothelial cells, and inflammatory cells. However, cIAP1 was not expressed in nasal polyps, whereas cIAP2 and XIAP were expressed in submucosal glands, epithelial cells, vascular endothelial cells, and inflammatory cells. Caspase 3 was localized to a portion of the epithelial cells in normal nasal mucosa and nasal polyps. Survivin was not expressed in any samples. Furthermore, cIAP2, XIAP, and caspase 3 did not show a significant difference in their expression levels between normal nasal mucosa and nasal polyps.

Conclusion  The present results indicate that cIAP1, cIAP2, XIAP, and caspase 3 may regulate the homeostasis of normal nasal mucosa, whereas cIAP2, XIAP, and caspase 3 may take part in the pathogenesis of nasal polyps.

Author Affiliations: Department of Otorhinolaryngology–Head and Neck Surgery, College of Medicine, Hanyang University (Drs Cho and K. R. Kim), and Department of Otorhinolaryngology–Head and Neck Surgery, College of Medicine, Korea University (Drs Sang Hag Lee, H. M. Lee, Seung Hoon Lee, and T. H. Kim), Seoul, South Korea.