1,8-Cineol Reduces Mucus-Production in a Novel Human Ex Vivo Model of Late Rhinosinusitis

Sudhoff H, Klenke C, Greiner JFW, Müller J, Brotzmann V, Ebmeyer J, Kaltschmidt B, Kaltschmidt C (2015)
PLoS ONE 10(7): e0133040.

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Abstract
Inflammatory diseases of the respiratory system such as rhinosinusitis, chronic obstructive pulmonary disease, or bronchial asthma are strongly associated with overproduction and hypersecretion of mucus lining the epithelial airway surface. 1,8-cineol, the active ingredient of the pharmaceutical drug Soledum, is commonly applied for treating such inflammatory airway diseases. However, its potential effects on mucus overproduction still remain unclear.In the present study, we successfully established ex vivo cultures of human nasal turbinate slices to investigate the effects of 1,8-cineol on mucus hypersecretion in experimentally induced rhinosinusitis. The presence of acetyl-α-tubulin-positive cilia confirmed the integrity of the ex vivo cultured epithelium. Mucin-filled goblet cells were also detectable in nasal slice cultures, as revealed by Alcian Blue and Periodic acid-Schiff stainings. Treatment of nasal slice cultures with lipopolysaccharides mimicking bacterial infection as observed during late rhinosinusitis led to a significantly increased number of mucin-filled goblet cells. Notably, the number of mucin-filled goblet cells was found to be significantly decreased after co-treatment with 1,8-cineol. On a molecular level, real time PCR-analysis further showed 1,8-cineol to significantly reduce the expression levels of the mucin genes MUC2 and MUC19 in close association with significantly attenuated NF-κB-activity. In conclusion, we demonstrate for the first time a 1,8-cineol-dependent reduction of mucin-filled goblet cells and MUC2-gene expression associated with an attenuated NF-κB-activity in human nasal slice cultures. Our findings suggest that these effects partially account for the clinical benefits of 1,8-cineol-based therapy during rhinosinusitis. Therefore, topical application of 1,8-cineol may offer a novel therapeutic approach to reduce bacteria-induced mucus hypersecretion.
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Article Processing Charge funded by the Deutsche Forschungsgemeinschaft and the Open Access Publication Fund of Bielefeld University.
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Sudhoff H, Klenke C, Greiner JFW, et al. 1,8-Cineol Reduces Mucus-Production in a Novel Human Ex Vivo Model of Late Rhinosinusitis. PLoS ONE. 2015;10(7): e0133040.
Sudhoff, H., Klenke, C., Greiner, J. F. W., Müller, J., Brotzmann, V., Ebmeyer, J., Kaltschmidt, B., et al. (2015). 1,8-Cineol Reduces Mucus-Production in a Novel Human Ex Vivo Model of Late Rhinosinusitis. PLoS ONE, 10(7): e0133040.
Sudhoff, H., Klenke, C., Greiner, J. F. W., Müller, J., Brotzmann, V., Ebmeyer, J., Kaltschmidt, B., and Kaltschmidt, C. (2015). 1,8-Cineol Reduces Mucus-Production in a Novel Human Ex Vivo Model of Late Rhinosinusitis. PLoS ONE 10:e0133040.
Sudhoff, H., et al., 2015. 1,8-Cineol Reduces Mucus-Production in a Novel Human Ex Vivo Model of Late Rhinosinusitis. PLoS ONE, 10(7): e0133040.
H. Sudhoff, et al., “1,8-Cineol Reduces Mucus-Production in a Novel Human Ex Vivo Model of Late Rhinosinusitis”, PLoS ONE, vol. 10, 2015, : e0133040.
Sudhoff, H., Klenke, C., Greiner, J.F.W., Müller, J., Brotzmann, V., Ebmeyer, J., Kaltschmidt, B., Kaltschmidt, C.: 1,8-Cineol Reduces Mucus-Production in a Novel Human Ex Vivo Model of Late Rhinosinusitis. PLoS ONE. 10, : e0133040 (2015).
Sudhoff, Holger, Klenke, Christin, Greiner, Johannes F. W., Müller, Janine, Brotzmann, Viktoria, Ebmeyer, Jörg, Kaltschmidt, Barbara, and Kaltschmidt, Christian. “1,8-Cineol Reduces Mucus-Production in a Novel Human Ex Vivo Model of Late Rhinosinusitis”. PLoS ONE 10.7 (2015): e0133040.
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