Journal Article

STAT3 activation in endothelial cells is important for tumor metastasis via increased cell adhesion molecule expression

Kwon, S-H, Jeong, H-S, Kim, K-J, Kim, H-R, Cho, C-H, Yun, J-H, Lee, E H, Ye, S-K

2017

Overview

Metastasis is a life-threatening feature of cancer and is primarily responsible for cancer patient mortality. Cross talk between tumor cells and endothelium is important for tumor progression and metastasis. However, very little is known about the mechanisms by which endothelial cells (ECs) that are close to tumor cells, respond to the tumor cells during tumor progression and metastasis. In this study, we exploited the use of EC-specific signal transducer activator of transcription 3 (STAT3) knockout mice to investigate the role of STAT3 in ECs in tumor progression and metastasis. We found that the loss of STAT3 in ECs did not affect primary Lewis lung carcinoma (LLC) tumor growth, but it reduced in vivo LLC metastasis in experimental and spontaneous metastasis models. Mechanistically, STAT3 activation upregulated cell adhesion molecule expression, including E-selectin and P-selectin, in murine endothelial MS-1 cells treated with tumor cell-conditioned media in vitro and in pre-metastatic lungs of tumor-bearing mice in vivo . We also found that both E-selectin and P-selectin were, at least in part, responsible for STAT3-induced adhesion and invasion of LLC cells through an EC monolayer. However, tumor cell-conditioned media from B16F10 melanoma cells did not activate STAT3 in MS-1 cells. As a result, EC STAT3 knockout did not affect B16F10 melanoma cell metastasis. In addition, various human cancer cells activated STAT3 in human ECs (HUVECs), resulting in increased cell adhesion molecule expression. Collectively, our findings demonstrate that STAT3 activation in ECs promotes tumor metastasis through the induction of cell adhesion molecules, demonstrating a role for ECs in response to tumor cells during tumor metastasis.

• Publisher: Nature Publishing Group UK,Nature Publishing Group
• Subject: 38/79 / 38/89 / 631/67/2328 / 631/67/322 / 631/80/79 / 64/60 / 82 / 82/51 / A549 Cells / Analysis / Animal models / Animals / Apoptosis / Cancer / Care and treatment / Cell activation / Cell adhesion & migration / Cell adhesion molecules / Cell Adhesion Molecules - biosynthesis / Cell Adhesion Molecules - genetics / Cell Biology / Cell Communication - physiology / Cell Line, Tumor / Development and progression / Diagnosis / E-selectin / Endothelial cells / Endothelial Cells - metabolism / Endothelial Cells - pathology / Endothelium / HCT116 Cells / Health aspects / Human Genetics / Humans / Internal Medicine / Lung carcinoma / Medicine / Medicine & Public Health / Melanoma / Melanoma, Experimental / Metastases / Metastasis / Mice / Mice, Inbred C57BL / Mice, Knockout / Molecular biology / Neoplasm Metastasis / Neoplasms - metabolism / Neoplasms - pathology / Oncology / original-article / P-selectin / Stat3 protein / STAT3 Transcription Factor - genetics / STAT3 Transcription Factor - metabolism / Transcription / Tumor cells / White blood cells