Chromosomal, epigenetic and microRNA-mediated inactivation of LRP1B, a modulator of the extracellular environment of thyroid cancer cells

被引：0
作者：
H Prazeres
J Torres
F Rodrigues
M Pinto
M C Pastoriza
D Gomes
J Cameselle-Teijeiro
A Vidal
T C Martins
M Sobrinho-Simões
P Soares
机构：
[1] Institute of Molecular Pathology and Immunology of the University of Porto (IPATIMUP),Department of Cancer Biology
[2] Medical Faculty,Department of Molecular Pathology
[3] University of Porto,Department of Endocrinology
[4] Service of the Portuguese Institute of Oncology of Coimbra,Department of Physiology
[5] EPE,Department of Anatomic Pathology
[6] Service of the Portuguese Institute of Oncology of Coimbra,undefined
[7] EPE,undefined
[8] School of Medicine,undefined
[9] University of Santiago de Compostela-Institute of Sanitary Research (IDIS),undefined
[10] Anatomic Pathology Service of the Portuguese Institute of Oncology of Coimbra,undefined
[11] EPE,undefined
[12] Clinical University Hospital (CHUS),undefined
[13] SERGAS,undefined
[14] University of Santiago de Compostela,undefined
来源：
Oncogene | 2011年 / 30卷
关键词：
tumor suppressor gene; low-density lipoprotein receptor family; EP300 histone-acetyltransferase; microRNA; matrix metalloproteinase 2; endocytosis and tumor microenvironment;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The low-density lipoprotein receptor-related protein (LRP1B), encoding an endocytic LDL-family receptor, is among the 10 most significantly deleted genes across 3312 human cancer specimens. However, currently the apparently crucial role of this lipoprotein receptor in carcinogenesis is not clear. Here we show that LRP1B inactivation (by chromosomal, epigenetic and microRNA (miR)-mediated mechanisms) results in changes to the tumor environment that confer cancer cells an increased growth and invasive capacity. LRP1B displays frequent DNA copy number loss and CpG island methylation, resulting in mRNA underexpression. By using CpG island reporters methylated in vitro, we found that DNA methylation disrupts a functional binding site for the histone-acetyltransferase p300 located at intron 1. We identified and validated an miR targeting LRP1B (miR-548a-5p), which is overexpressed in cancer cell lines as a result of 8q22 DNA gains. Restoration of LRP1B impaired in vitro and in vivo tumor growth, inhibited cell invasion and led to a reduction of matrix metalloproteinase 2 in the extracellular medium. We emphasized the role of an endocytic receptor acting as a tumor suppressor by modulating the extracellular environment composition in a way that constrains the invasive behavior of the cancer cells.
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页码：1302 / 1317
页数：15
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