Overexpression of transforming growth factor beta1 in head and neck epithelia results in inflammation, angiogenesis, and epithelial hyperproliferation

Cancer Research
Shi-Long LuXiao-Jing Wang

Abstract

In the present study, we show that transforming growth factor beta1 (TGF-beta1) was frequently overexpressed in human head and neck squamous cell carcinomas (HNSCCs) and adjacent tissues in comparison with normal head and neck tissues. To determine the role of TGF-beta1 overexpression in HNSCC carcinogenesis, we generated transgenic mice in which TGF-beta1 transgene expression can be induced in head and neck epithelia. TGF-beta1 transgene induction in head and neck epithelia, at levels similar to those in human HNSCCs, caused severe inflammation and angiogenesis. Consequently, TGF-beta1-transgenic epithelia exhibited hyperproliferation. These phenotypes correlated with enhanced Smad signaling in transgenic epithelia and stroma. Our study suggests that TGF-beta1 overexpression at early stages of HNSCC formation provides a tumor promoting microenvironment.

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Citations

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