title: Effect of HA-1A monoclonal IgM antibody on endotoxin-induced proliferation of cultured rat middle ear epithelium.
abstract: The effect of human monoclonal antibody HA-1A (Centoxin) on the effect of endotoxin on cultured rat middle ear epithelium was investigated. The addition of endotoxin to the standard culture medium revealed a concentration-related proliferative effect on cultured rat middle ear epithelium, leading to cobblestone cells, cell tracks, and stratification of epithelium, whereas rat middle ear epithelium cultured in standard medium grew as a monolayer composed of flat polygonal cells. Addition of HA-1A to standard medium supplemented with endotoxin gave rise to a statistically significant suppression of the proliferative effects of endotoxin on these cells. The morphology of rat middle ear epithelium cultured in the presence of HA-1A and endotoxin showed that these cells still had a tendency to form cobblestone-like cells and cell tracks, but to a substantially lower degree. The present results support the hypothesis that HA-1A suppresses the proliferative and morphological effects of endotoxin on rat middle ear epithelium and may play an important role in the pathogenesis of otitis media.
authors.affiliation: Department of Otorhinolaryngology, Leiden University Hospital, The Netherlands.
authors.forename: J J
authors.initials: JJ
authors.lastname: Grote
authors.forename: S C
authors.initials: SC
authors.lastname: Hesseling
authors.forename: G J
authors.initials: GJ
authors.lastname: Tjebbes
authors.forename: C A
authors.initials: CA
authors.lastname: van Blitterswijk
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000494:pharmacology*; D061067:Antibodies, Monoclonal, Humanized; D002455:Cell Division / Q000187:drug effects; D002478:Cells, Cultured; D004432:Ear, Middle / Q000166:cytology* / Q000187:drug effects; D004731:Endotoxins / Q000276:immunology* / Q000494:pharmacology; D004847:Epithelial Cells; D004848:Epithelium / Q000187:drug effects; D007075:Immunoglobulin M / Q000276:immunology; D010033:Otitis Media / Q000209:etiology; D051381:Rats
chemical_list: D000911:Antibodies, Monoclonal; D061067:Antibodies, Monoclonal, Humanized; D004731:Endotoxins; D007075:Immunoglobulin M; C068069:nebacumab