Mda-7/IL-24 expression inhibits breast cancer through upregulation of growth arrest-specific gene 3 (gas3) and disruption of β1 integrin function

You Jun Li, Guodong Liu, Yanmei Li, Laura M. Vecchiarelli-Federico, Jeff C. Liu, Eldad Zacksenhaus, Sze W. Shan, Burton B. Yang, Qi Li, Rupesh Dash, Paul B. Fisher, Michael C. Archer, Yaacov Ben-David

Research output: Journal article publicationJournal articleAcademic researchpeer-review

18 Citations (Scopus)


Melanoma differentiation-associated gene (MDA)-7)/interleukin (IL)-24, a member of the IL-10 family of cytokines, inhibits growth of various human cancer cells, yet the underlying mechanism is largely unknown. Here, we report that mda-7/IL-24 efficiently suppresses the development of rat mammary tumors in vivo. Microarray analysis for genes differentially expressed in rat mammary tumor cells overexpressing MDA-7/IL-24 compared with those that do not express this cytokine identified growth arrest-specific gene-3 (gas3) as a target for mda-7/IL-24. Upregulation of gas3 by mda-7/IL-24 was STAT3 dependent. Induction of gas3 inhibited attachment and proliferation of tumor cells in vitro and in vivo by inhibiting the interaction of β 1 integrin with fibronectin. A mutated GAS3, which is unable to bind β 1 integrin, was also unable to inhibit fibronectin-mediated attachment and cell growth both in adherent and suspension cultures, suggesting that GAS3 exerts its effects through interaction with and regulation of β1 integrin. Thus, mda-7/IL-24 inhibits breast cancer growth, at least in part, through upregulation of GAS3 and disruption of β1 integrin function. Importantly, the expression of the mda-7/IL-24 receptor, IL-20R1, is highly correlated with GAS3 expression in human breast cancer (P= 1.02 × 10-9), and the incidence of metastases is significantly reduced in patients with HER2 breast cancer expressing high-levels of IL-20R1. Together, our results identify a novel MDA-7/IL-24-GAS3-β 1integrin - fibronectin signaling pathway that suppresses breast cancer growth and can be targeted for therapy.

Original languageEnglish
Pages (from-to)593-603
Number of pages11
JournalMolecular Cancer Research
Issue number6
Publication statusPublished - Jun 2013
Externally publishedYes

ASJC Scopus subject areas

  • Molecular Biology
  • Oncology
  • Cancer Research


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