Abstract
Tissue remodeling is an important characteristic of nasal polyps (NPs). However, the mechanisms underlying the remodeling processes are poorly defined. This study investigated the role of transforming growth factor (TGF) beta1 and eosinophils in the expression of tenascin C (Tn-C), an extracellular matrix glycoprotein, in NPs. The protein expression of Tn-C and TGF-beta1 was examined by means of immunohistochemistry in NPs and normal control inferior turbinate tissues. Furthermore, cell culture, quantitative RT-PCR, and in situ immunocytofluorescence techniques were used to investigate the direct effect of TGF-beta1 and eosinophils on Tn-C production in primary nasal epithelial cells. Tn-C protein expression was significantly up-regulated in NP tissues and correlated with TGF-beta1+ eosinophils. TGF-beta1 and eosinophils dramatically induced Tn-C mRNA and protein expression in nasal epithelial cells. The effect of eosinophils could be inhibited partly by a neutralizing antibody to TGF-beta1. Eosinophil-derived TGF-beta1 may contribute, at least in part, to the tissue remodeling in NPs.
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