miR-200 Inhibits lung adenocarcinoma cell invasion and metastasis by targeting Flt1/VEGFR1.
The microRNA-200 (miR-200) family is part of a gene expression signature that predicts poor prognosis in lung cancer patients. In a mouse model of K-ras/p53-mutant lung adenocarcinoma, miR-200 levels are suppressed in metastasis-prone tumor cells, and forced miR-200 expression inhibits tumor growth and metastasis, but the miR-200 target genes that drive lung tumorigenesis have not been fully elucidated. Here, we scanned the genome for putative miR-200 binding sites and found them in the 3'-untranslated region (3'-UTR) of 35 genes that are amplified in human cancer. Mining of a database of resected human lung adenocarcinomas revealed that the levels of one of these genes, Flt1/VEGFR1, correlate inversely with duration of survival. Forced miR-200 expression suppressed Flt1 levels in metastasis-prone lung adenocarcinoma cells derived from K-ras/p53-mutant mice, and negatively regulated the Flt1 3'-UTR in reporter assays. Cancer-associated fibroblasts (CAFs) isolated from murine lung adenocarcinomas secreted abundant VEGF and enhanced tumor cell invasion in coculture studies. CAF-induced tumor cell invasion was abrogated by VEGF neutralization or Flt1 knockdown in tumor cells. Flt1 knockdown decreased the growth and metastasis of tumor cells in syngeneic mice. We conclude that miR-200 suppresses lung tumorigenesis by targeting Flt1.
University of Texas MD Anderson Cancer Center, Box 432, 1515 Holcombe Blvd, Houston, TX 77030, USA.
Jonathon D
JD
Roybal
Yi
Y
Zang
Young-Ho
YH
Ahn
Yanan
Y
Yang
Don L
DL
Gibbons
Brandi N
BN
Baird
Cristina
C
Alvarez
Nishan
N
Thilaganathan
Diane D
DD
Liu
Pierre
P
Saintigny
John V
JV
Heymach
Chad J
CJ
Creighton
Jonathan M
JM
Kurie
D020413:3' Untranslated Regions / Q000235:genetics; D000230:Adenocarcinoma / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D000818:Animals; D001665:Binding Sites / Q000235:genetics; D045744:Cell Line, Tumor; D002465:Cell Movement / Q000235:genetics; D002478:Cells, Cultured; D018920:Coculture Techniques; D005347:Fibroblasts / Q000166:cytology / Q000378:metabolism; D006801:Humans; D053208:Kaplan-Meier Estimate; D008175:Lung Neoplasms / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D051379:Mice; D057507:Mice, 129 Strain; D018345:Mice, Knockout; D035683:MicroRNAs / Q000235:genetics*; D008856:Microscopy, Fluorescence; D009361:Neoplasm Invasiveness; D009362:Neoplasm Metastasis; D034622:RNA Interference; D020133:Reverse Transcriptase Polymerase Chain Reaction; D042461:Vascular Endothelial Growth Factor A / Q000235:genetics / Q000378:metabolism; D040281:Vascular Endothelial Growth Factor Receptor-1 / Q000235:genetics* / Q000378:metabolism
D020413:3' Untranslated Regions; C533896:MIRN200 microRNA, human; D035683:MicroRNAs; D042461:Vascular Endothelial Growth Factor A; D040281:Vascular Endothelial Growth Factor Receptor-1