Wang XH, Wu HY, Gao J, Wang XH, Gao TH, Zhang SF. FGF represses metastasis of neuroblastoma regulated by MYCN and TGF-β1 induced LMO1 via control of let-7 expression.
Brain Res 2018;
1704:219-228. [PMID:
30321496 DOI:
10.1016/j.brainres.2018.10.015]
[Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Revised: 09/10/2018] [Accepted: 10/11/2018] [Indexed: 11/18/2022]
Abstract
BACKGROUND
MYCN and LMO1 amplification are commonly observed in neuroblastoma (NB), which was often accompanied by genetic loss of let-7 microRNA (miRNA). Fibroblast growth factor (FGF) was found to regulate let-7 miRNA expression via FGF receptor substrate 2 (FRS2), which then activates transforming growth factor beta (TGF-β) signaling.
METHODS
Expression of MYCN, LMO1, FRS2, let-7, and TGF-β receptor I (TGFβRI) was selectively knocked-down or enhanced in NB cells. Proliferation, invasion, migration, metastasis and tumorigenesis of NB, expression of downstream signaling factors and metastasis-associated protein were evaluated.
RESULTS
Knock-down on either MYCN or LMO1 has led to inhibition on proliferation, invasion, migration, and metastasis of NB cells, and knock-down of FRS2 resulted in increases in MYCN and LMO1 expression and enhanced invasion, migration and metastasis of NB cells. Decreased expression of TGF-β1 or TGFβRI led to decrease expression in LMO1 and proliferation, invasion, migration and metastasis markers, except MYCN expression which appeared not to be regulated by TGF-β1 or TGFβRI. Furthermore, let-7 miRNA was shown to decrease the expression levels of TGF-βRI, LMO1 and MYCN.
CONCLUSIONS
FGF regulates MYCN and TGF-β1-induced LMO1 and metastasis of NB cells via let-7 miRNA.
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