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Effect of platelet-activating factor on secretion of mucous glycoprotein from chinchilla middle ear epithelial cells in vitro

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Abstract

Platelet-activating factor (PAF) is a naturally occurring phospholipid that acts as a pleiotropic mediator and mediates cell-cell reactions under physiological and pathological conditions. Recently, it has been shown that PAF is a strong secretagogue of mucous glycoprotein in the airways, suggesting its role in mucous glycoprotein secretion and the pathogenesis of otitis media with effusion. In the current study, we examined the effect of PAF on mucous glycoprotein secretion in cultured chinchilla middle ear epithelial cells. PAF at 1 μM significantly stimulated mucous glycoprotein secretion from cultured chinchilla middle ear epithelial cells. This action was concentration-dependent, with secretions reaching near maximum when the cells were incubated with PAF at 100 μM. In a time-dependent study, PAF demonstrated an initial rapid stimulation of mucous glycoprotein secretion, followed by a gradual increase thereafter. A six-fold increase was seen in the first 2 h compared with controls. Cycloheximide, a protein synthesis inhibitor, demonstrated an inhibitory effect on PAF-stimulated mucous glycoprotein secretion in this study. These findings suggest that PAF plays an important role in the pathogenesis of otitis media with effusion by stimulating mucous glycoprotein secretion in vitro.

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Authors and Affiliations

  1. Department of Otolaryngology, University of Minnesota Otitis Media Research Center, University of Minnesota Medical School, 55455, Minneapolis, MN, USA

    J. Lin, C. Lees & S. K. Juhn

  2. Department of Pediatrics, University of Minnesota Otitis Media Research Center, University of Minnesota Medical School, 55455, Minneapolis, MN, USA

    Y. Kim

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  1. J. Lin
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  2. Y. Kim
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  3. C. Lees
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  4. S. K. Juhn
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Supported by NIH grant P0I-D000133 from the National Institute on Deafness and Other Communication Disorders.

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Lin, J., Kim, Y., Lees, C. et al. Effect of platelet-activating factor on secretion of mucous glycoprotein from chinchilla middle ear epithelial cells in vitro. Eur Arch Otorhinolaryngol 252, 92–96 (1995). https://doi.org/10.1007/BF00168027

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  • DOI: https://doi.org/10.1007/BF00168027

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