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Background and Objectives:Nasal polyp is non-neoplastic, chronic inflammatory disease of the nasal mucosa. Oxidative stress may be related to the pathogenesis of nasal polyp. Oxidative stress may be potential inducers of heme oxygenase (HO-1) expression. To illustrate the role of the HO-1 in the nasal polyp, we investigated the expressive pattern of the HO-1 in the nasal polyp and the influence of corticosteroids on its expression. Subjects and Method:The study materials were 28 specimens of nasal polyp (steroid user:13 cases, steroid non-user:15 cases) taken from 28 patients during endoscopic sinus surgery and 11 cases of normal nasal mucosa of the inferior turbinate as control. The HO-1 expression was assessed by immunohistochemical staining. Results:The HO-1 was mainly expressed on non-epithelial cells in the lamina propria of nasal polyps in 20/28 (71.4%). The expression of HO-1 was positive in 11 out of 13 (84.6%) and 9 out of 15 (60%) subjects for steroid user and steroid non-user group, respectively. The inflammatory cells were almost identified as macrophage by using a macrophage specific marker (CD68+). The HO-1 was not expressed in normal control at all. There was no significant difference in the expression of HO-1 between the steroid user group and the non-user group. Conclusion:HO-1, as an important endogenous antioxidant enzyme, may play a protective role in the pathogenesis of nasal polyp. Steroid may not regulate the HO-1 expression in the nasal polyp.

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