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April 1996

Increased Epithelial Cell Proliferation in Nasal Polyps

Author Affiliations

From the Department of Oto-Rhino-Laryngology and Head and Neck Surgery, Henri Mondor and Interncommunal University Hospitals, University of Paris XII, Créteil, France (Drs Coste, Gilain, and Peynègre); Department of Histology (Drs Coste and Escudier and Mss Chapelin and Poron) and Clinical and Biostatistical Evaluation Unit (Dr Roudot-Thoraval), Faculty of Medicine, University of Paris XII, Créteil; and the Laboratory of Histology and Biology of Tumors, Tenon University Hospital, University of Paris (France) VI (Drs Rateau and Bernaudin).

Arch Otolaryngol Head Neck Surg. 1996;122(4):432-436. doi:10.1001/archotol.1996.01890160072013

Objective:  To detect, quantify, and compare respiratory epithelial cell proliferation in nasal mucosa and polyps from patients with nasal polyposis.

Design:  Cohort study.

Setting:  Patients and samples were selected at the Hôpital Intercommunal de Créteil (France). Flow cytofluorometry and immunohistochemistry were performed at Hôpitaux Tenon and Mondor (Université Paris [France] VI et XII).

Patients:  Twenty-one patients undergoing endoscopic ethmoidectomy for treatment of nasal polyposis.

Methods:  In 10 cases, epithelial cells were removed from frozen inferior turbinate mucosa and polyps by mechanical disaggregation and were then analyzed by flow cytofluorometry, providing the cell DNA content (propidium iodide labeling) and the percentage of S-phase cells. In 11 cases, inferior turbinate mucosa and polyps were fixed in formaldehyde and embedded in paraffin. Proliferating cell nuclear antigen expression in the epithelium was quantified by immunohistochemistry: a proliferating cell nuclear antigen index was calculated for each sample in the basal area, suprabasal area, and full height of the epithelium.

Results:  All cell populations studied were diploid, and percentages of S-phase cells were significantly higher in nasal polyps than in mucosa. Proliferating cell nuclear antigen indexes were significantly higher in nasal polyps than in the suprabasal area and full height of the mucosal epithelium.

Conclusion:  Cell proliferation is increased in epithelium from nasal polyps. Epithelial damage caused by inflammatory mediators could induce this increased cell proliferation via epithelial repair processes. Inflammatory cells could up-regulate epithelial cell proliferation by secreting growth factors.(Arch Otolaryngol Head Neck Surg. 1996;122:432-436)