GSE202235
RNA m6A reader IGF2BP3 promotes metastasis of triple-negative breast cancer via SLIT2 repression (MeRIP-Seq)
Triple-negative breast cancer (TNBC) is a group of fatal malignancies characterized by high metastatic capacity, the underlying mechanisms of which remain largely elusive. We found here that insulin-like growth factor 2 mRNA binding protein 3 (IGF2BP3), but not other members of the IGF2BP family, is highly expressed in breast cancer and correlated clinically with TNBC metastasis and patient prognosis. IGF2BP3 promotes the migration and invasion capabilities of TNBC cells dependent upon cellular RNA N6-methyladenosine (m6A) modification. Mechanistically, IGF2BP3 binds to and unstabilizes m6A-methylated mRNA of the extracellular matrix glycoprotein, SLIT2, impairs its downstream signaling via the cognate receptor ROBO1, and consequently derepresses the canonical oncogenic PI3K/AKT and MEK/ERK pathways. These findings shed light into the regulatory network of distal metastasis and provide rationale for targeting the m6A machinery in the treatment of TNBC Overall design: RIP-seq analysis of m6A-IP versus input in MDA-MB-231 cells