Research Article: Ciliated Cells Express a Novel Pattern of Brain-Derived Neurotrophic Factor in Allergic Rhinitis
Abstract:
It has been reported that allergic rhinitis (AR) affects –% population around the world, which disturbs people`s life severely and becomes a major medical burden and disability globally. It`s well known that AR is induced by type helper (Th) cells, pushing B cells to secret specific immunoglobulin E (IgE) against inhaled allergen. With the infiltrate of inflammatory cells, and their secreted inflammatory cytokines like interleukin- (IL-)/interleukin- (IL-)/interleukin- (IL-), the immune microenvironment have changed, affecting the normal epithelium growth pattern, including epithelial barrier dysfunction, nasal sensitized, elevation of nasal mucous and also the dysfunction of nasal mucosa cilia cells.– Worldwide researchers have reached a consensus that the function of ciliated cells is disturbed under AR. As found by Liu et al, ciliated cells in the epithelium became sticky integrated, dumping epithelium and even loss in AR patients, its mucociliary clearance time (MCCT) was much lower than the normal person, this phenomenon may attribute to the development of AR. We observed the changes of ciliated cells in the nasal mucosa, but didn`t detect the deep reason for which factor-induced abnormality of ciliated cells. Some studies indicated that the expressions of FOXJ/ DNAI/DNALI/DNAH were dropped in AR patients. Neurotrophins in nasal mucosa have an effect on the histopathology of AR, which include both brain-derived neurotrophic factor (BDNF) as well as nerve growth factor (NGF), being secreted by the nasal mucosa., Upregulated expressions of BDNF and NGF have a positive correlation with nasal symptoms, with product in the nasal mucosa, it could release at synapse and influence the sensitivity of nasal nerves. In our previous study, we found that the presence of BDNF gene variants elevated the likelihood of developing moderate-to-severe allergic rhinitis. Being produced and secreted by eosinophils, BDNF plays several functions in the nasal epithelium, such as affecting the pathogenesis of nasal polyps and influencing the polarization of macrophages in the nasal mucosa. BDNF also can be expressed in endothelial cells, inducing nitric oxide (NO) production, and promoting endothelial cell survival and proliferation. In nasal mucosa, BDNF can be expressed in the basal layer of nasal epithelial cells, which may contribute to its differentiation of progenitor/stem cells. Nonetheless, so far few studies focus on BDNF localization in the nasal mucosa, including ciliated cells, goblet cells, and basal cells.
Introduction:
It has been reported that allergic rhinitis (AR) affects –% population around the world, which disturbs people`s life severely and becomes a major medical burden and disability globally. It`s well known that AR is induced by type helper (Th) cells, pushing B cells to secret specific immunoglobulin E (IgE) against inhaled allergen. With the infiltrate of inflammatory cells, and their secreted inflammatory cytokines like interleukin- (IL-)/interleukin- (IL-)/interleukin- (IL-), the immune microenvironment have…
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