TGFb-Induced Lung Cancer Cell Migration Is NR4A1-Dependent

Erik Hedrick, Kumaravel Mohankumar, Stephen Safe

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


TGFb induces migration of lung cancer cells (A549, H460, and H1299), dependent on activation of c-Jun N-terminal kinase (JNK1), and is inhibited by the JNK1 inhibitor SP600125. Moreover, TGFb-induced migration of the cells is also blocked by the nuclear export inhibitor leptomycin B (LMB) and the orphan nuclear receptor 4A1 (NR4A1) ligand 1,1-bis(3'-indolyl)-1-(p-hydroxyphenyl)methane (CDIM8), which retains NR4A1 in the nucleus. Subsequent analysis showed that the TGFb/TGFb receptor/PKA/MKK4 and -7/JNK pathway cascade phosphorylates and induces nuclear export of NR4A1, which in turn forms an active complex with Axin2, Arkadia (RNF111), and RNF12 (RLIM) to induce proteasome-dependent degradation of SMAD7 and enhance lung cancer cell migration. Thus, NR4A1 also plays an integral role in mediating TGFb-induced lung cancer invasion, and the NR4A1 ligand CDIM8, which binds nuclear NR4A1, represents a novel therapeutic approach for TGFb-induced blocking of lung cancer migration/ invasion.

Original languageEnglish (US)
Pages (from-to)1991-2002
Number of pages12
JournalMolecular Cancer Research
Issue number12
StatePublished - Dec 1 2018

ASJC Scopus subject areas

  • Molecular Biology
  • Oncology
  • Cancer Research


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