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Cancer Res. 2016 Jun 15;76(12):3520-30. doi: 10.1158/0008-5472.CAN-15-3465. Epub 2016 Apr 13.

MYC Is a Crucial Mediator of TGFβ-Induced Invasion in Basal Breast Cancer.

Author information

1
Department of Cancer Biology, Mayo Clinic Cancer Center, Jacksonville, Florida.
2
Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, South Carolina.
3
Department of Cancer Biology, Mayo Clinic Cancer Center, Jacksonville, Florida. radisky.derek@mayo.edu.

Abstract

Basal subtype breast cancers have a particularly poor prognosis, with high invasiveness and resistance to most targeted therapies. TGFβ and MYC drive central features of basal breast cancer: TGFβ is an autocrine and paracrine signaling factor that drives cell invasion and metastasis, and MYC is a central regulator of cellular proliferation that is upregulated in many cancer types. We show here that genetic or pharmacologic inhibition of MYC in MCF10A basal breast cells results in increased sensitivity to TGFβ-stimulated invasion and metastasis and also show that this signaling loop is dependent on activation of SRC. Analysis of human breast cancer datasets and additional experiments with breast cancer cell lines further suggest the relevance of this signaling loop in basal, but not luminal, breast cancers. Our results imply precaution should be taken when utilizing therapeutic inhibitors of MYC with basal breast cancer patients as this could lead to increased metastasis; however, simultaneous pharmacologic inhibition of SRC and MYC for these patients could facilitate the antiproliferative effects of MYC inhibition while blocking the consequent promotion of metastasis. Cancer Res; 76(12); 3520-30.

PMID:
27197167
PMCID:
PMC4911305
DOI:
10.1158/0008-5472.CAN-15-3465
[Indexed for MEDLINE]
Free PMC Article

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