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2018 ; 9
(2
): 219
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KRAS induces lung tumorigenesis through microRNAs modulation
#MMPMID29440633
Shi L
; Middleton J
; Jeon YJ
; Magee P
; Veneziano D
; Laganą A
; Leong HS
; Sahoo S
; Fassan M
; Booton R
; Shah R
; Crosbie PAJ
; Garofalo M
Cell Death Dis
2018[Feb]; 9
(2
): 219
PMID29440633
show ga
Oncogenic KRAS induces tumor onset and development by modulating gene expression
via different molecular mechanisms. MicroRNAs (miRNAs) are small non-coding RNAs
that have been established as main players in tumorigenesis. By overexpressing
wild type or mutant KRAS (KRAS(G12D)) and using inducible human and mouse cell
lines, we analyzed KRAS-regulated microRNAs in non-small-cell lung cancer
(NSCLC). We show that miR-30c and miR-21 are significantly upregulated by both
KRAS isoforms and induce drug resistance and enhance cell migration/invasion via
inhibiting crucial tumor suppressor genes, such as NF1, RASA1, BID, and RASSF8.
MiR-30c and miR-21 levels were significantly elevated in tumors from patients
that underwent surgical resection of early stages NSCLC compared to normal lung
and in plasma from the same patients. Systemic delivery of LNA-anti-miR-21 in
combination with cisplatin in vivo completely suppressed the development of lung
tumors in a mouse model of lung cancer. Mechanistically, we demonstrated that
ELK1 is responsible for miR-30c and miR-21 transcriptional activation by direct
binding to the miRNA proximal promoter regions. In summary, our study defines
that miR-30c and miR-21 may be valid biomarkers for early NSCLC detection and
their silencing could be beneficial for therapeutic applications.