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A Hypoxia-Induced Vascular Endothelial-to-Mesenchymal Transition in Development of Radiation-Induced Pulmonary Fibrosis

 Seo-Hyun Choi ; Zhen-Yu Hong ; Yoon-Jin Lee ; Jaeho Cho ; Yun-Sil Lee ; Young Hoon Ji ; Seungwoo Park ; Kyung Hwan Kim ; Chang Young Lee ; Yong Jin Lee ; Ran Ji Yoo ; Junho Jang ; Hae-June Lee ; Jae-Kyung Nam 
 Clinical Cancer Research, Vol.21(16) : 3716~3726, 2015 
Journal Title
 Clinical Cancer Research 
Issue Date
PURPOSE: Radiation-induced pulmonary fibrosis (RIPF) is a late side effect of thoracic radiotherapy. The purpose of our study was to gain further insight into the development of RIPF. EXPERIMENTAL DESIGN/RESULTS: Here, we observed that irradiation of mouse lungs induced collagen deposition, particularly around blood vessels, in the early phase of RIPF. Such deposition subsequently became evident throughout the irradiated tissues. Accompanied by the collagen deposition, vascular EndMT (endothelial-to-mesenchymal transition) began to develop in the early phase of RIPF, before the appearance of EMT (epithelial-to-mesenchymal transition) of alveolar epithelial (AE) II cells in the substantive fibrotic phase. Concomitant with the EndMT, we detected vascular endothelial cell (EC)-specific hypoxic damage in the irradiated lung tissues. In human pulmonary artery endothelial cells (HPAEC), the radiation-induced EndMT via activation of TGFβ-R1/Smad signaling was dependent on HIF1α expression. A novel HIF1α inhibitor, 2-methoxyestradiol (2-ME), inhibited the irradiation-induced EndMT via downregulation of HIF1α-dependent Smad signaling. In vivo, 2-ME inhibited the vascular EndMT, and decreased the collagen deposition associated with RIPF. Furthermore, HIF1α-related EndMT was observed also in human RIPF tissues. CONCLUSIONS: We provide the first evidence that an EndMT occurs in RIPF development and that the EndMT may be effectively inhibited by modulating vascular EC-specific hypoxic damage.
Appears in Collections:
1. 연구논문 > 1. College of Medicine > Yonsei Biomedical Research Center
1. 연구논문 > 1. College of Medicine > Dept. of Thoracic & Cardiovascular Surgery
1. 연구논문 > 1. College of Medicine > Dept. of Radiation Oncology
Yonsei Authors
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