Little is known of the inflammatory mechanisms of chronic otitis media that lead to inner ear pathology. Therefore, the long-term goal of this research program is to identify and prevent the inflammatory processes by which chronic middle ear disease causes permanent cochlear damage. Preliminary studies have determined that acute and chronic middle ear inflammation induces cytokine gene expression by inner ear tissues. This inner ear gene expression profile includes inflammatory mediators, as well as tissue remodeling cytokines, such as fibroblast growth factors (FGF), bone morphogenetic proteins (BMP), vascular endothelial growth factor (VEGF), etc. This has provided new insights into the inflammatory mechanisms by which otitis media causes permanent cochlear changes, such as sensorineural hearing loss. Our preliminary studies also showed that steroid treatments can reverse these cochlear problems if caught early enough. Therefore, our underlying hypothesis is that the sensorineural hearing loss and cochlear tissue remodeling that occurs in chronic otitis media can be prevented or reversed if the proper therapeutic treatment is targeted to the specific inflammatory process that is active. The proposed study will characterize the pathologic mechanisms of inner ear gene expression due to acute and chronic middle ear inflammation and assess how these pathologic processes can be controlled by targeted therapies. The proposed studies will utilize BALB/c mice inoculated with heat-killed bacteria (acute otitis media) and C3H/HeJ mice defective for Toll-like receptor 4 (chronic otitis media).
Aim 1 will determine the inner ear cytokine genes expressed during the progression from acute to chronic middle ear inflammation;
Aim 2 will characterize the genes underlying inner ear tissue remodeling during the progression from acute to chronic middle ear inflammation;
Aim 3 will exploit different toll-like receptor knockout mice to determine which bacterial components and inflammatory pathways regulate specific cochlear cytokine genes for inflammation and remodeling, and Aim 4 will develop the most appropriate interventional therapies to control these phases of inner ear gene expression during the progression from acute to chronic middle ear inflammation. These studies will identify the specific gene expression mechanisms underlying cochlear pathology due to middle ear inflammation and develop therapies that can be targeted to the relevant immune processes. This will lay important groundwork for the development of better clinical treatment options for children and adults with chronic otitis media to prevent permanent sensorineural hearing loss and other cochlear pathology. A study is proposed to evaluate the mechanisms by which chronic middle ear inflammation leads to cochlear pathology. Mouse models for acute and chronic middle ear disease will assess the role of different bacterial components on cytokine gene expression in the middle and inner ear and how this expression changes as inflammation transitions from an innate immune response to a cell-mediated adaptive immune response. Finally, various treatments will be targeted to these specific phases of inflammation to suppress the immune responses and protect the inner ear from permanent damage.
A study is proposed to evaluate the mechanisms by which chronic middle ear inflammation leads to cochlear pathology. Mouse models for acute and chronic middle ear disease will assess the role of different bacterial components on cytokine gene expression in the middle and inner ear and how this expression changes as inflammation transitions from an innate immune response to a cell-mediated adaptive immune response. Finally, various treatments will be targeted to these specific phases of inflammation to suppress the immune responses and protect the inner ear from permanent damage.
| Trune, Dennis R; Kempton, Beth; Hausman, Frances A et al. (2015) Correlative mRNA and protein expression of middle and inner ear inflammatory cytokines during mouse acute otitis media. Hear Res 326:49-58 |
| MacArthur, Carol J; Wilmot, Beth; Wang, Linda et al. (2014) Genetic susceptibility to chronic otitis media with effusion: candidate gene single nucleotide polymorphisms. Laryngoscope 124:1229-35 |
| MacArthur, Carol J; Hausman, Fran; Kempton, J Beth et al. (2013) Otitis media impacts hundreds of mouse middle and inner ear genes. PLoS One 8:e75213 |
| MacArthur, Carol J; Hausman, Fran; Kempton, J Beth et al. (2013) Inner ear tissue remodeling and ion homeostasis gene alteration in murine chronic otitis media. Otol Neurotol 34:338-46 |
| Morris, Lisa M; DeGagne, Jacqueline M; Kempton, J Beth et al. (2012) Mouse middle ear ion homeostasis channels and intercellular junctions. PLoS One 7:e39004 |
| MacArthur, C J; Hausman, F; Kempton, B et al. (2012) Otitis media: molecular impact of inflammation in the middle and inner ear--cytokines, steroids, and ion homeostasis. Laryngoscope 122 Suppl 4:S59-60 |
| Sautter, Nathan B; Delaney, Katherine L; Hausman, Frances A et al. (2012) Tissue remodeling gene expression in a murine model of chronic rhinosinusitis. Laryngoscope 122:711-7 |
| Sautter, Nathan B; Delaney, Katherine L; Trune, Dennis R (2011) Altered expression of tissue remodeling genes in a mouse model of acute allergic rhinitis. Int Forum Allergy Rhinol 1:262-7 |
| MacArthur, Carol J; Hausman, Frances; Kempton, Julia Beth et al. (2011) Murine middle ear inflammation and ion homeostasis gene expression. Otol Neurotol 32:508-15 |
| MacArthur, Carol J; Pillers, De-Ann M; Pang, Jiaqing et al. (2011) Altered expression of middle and inner ear cytokines in mouse otitis media. Laryngoscope 121:365-71 |
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