MAPK4 promotes triple negative breast cancer growth and reduces tumor sensitivity to PI3K blockade
Copyright policy )MAPK4 promotes triple negative breast cancer growth and reduces tumor sensitivity to PI3K blockade
AbstractAbout 15–20% of breast cancer (BCa) is triple-negative BCa (TNBC), a devastating disease with limited therapeutic options. Aberrations in the PI3K/PTEN signaling pathway are common in TNBC. However, the therapeutic impact of PI3K inhibitors in TNBC has been limited and the mechanism(s) underlying this lack of efficacy remain elusive. Here, we demonstrate that a large subset of TNBC expresses significant levels of MAPK4, and this expression is critical for driving AKT activation independent of PI3K and promoting TNBC cell and xenograft growth. The ability of MAPK4 to bypass PI3K for AKT activation potentially provides a direct mechanism regulating tumor sensitivity to PI3K inhibition. Accordingly, repressing MAPK4 greatly sensitizes TNBC cells and xenografts to PI3K blockade. Altogether, we conclude that high MAPK4 expression defines a large subset or subtype of TNBC responsive to MAPK4 blockage. Targeting MAPK4 in this subset/subtype of TNBC both represses growth and sensitizes tumors to PI3K blockade.
- University of California, San Francisco United States
- BAYLOR COLLEGE OF MEDICINE
- Baylor College of Medicine United States
- Dan L Duncan Comprehensive Cancer Center United States
- Texas Medical Center United States
Medical Sciences, Digestive System Diseases, Science, 610, Diseases, Breast Neoplasms, Triple Negative Breast Neoplasms, Mice, SCID, SCID, Article, Cell Line, Mice, Phosphatidylinositol 3-Kinases, Cell Line, Tumor, Breast Cancer, Medical Specialties, Medicine and Health Sciences, Genetics, Animals, Humans, Cancer, Phosphoinositide-3 Kinase Inhibitors, Neoplastic, Tumor, TOR Serine-Threonine Kinases, Human Genome, Q, Gastroenterology, PTEN Phosphohydrolase, Xenograft Model Antitumor Assays, Gene Expression Regulation, Neoplastic, Oncology, Gene Expression Regulation, Female, Mitogen-Activated Protein Kinases, Proto-Oncogene Proteins c-akt, RNA Helicases, Signal Transduction
Medical Sciences, Digestive System Diseases, Science, 610, Diseases, Breast Neoplasms, Triple Negative Breast Neoplasms, Mice, SCID, SCID, Article, Cell Line, Mice, Phosphatidylinositol 3-Kinases, Cell Line, Tumor, Breast Cancer, Medical Specialties, Medicine and Health Sciences, Genetics, Animals, Humans, Cancer, Phosphoinositide-3 Kinase Inhibitors, Neoplastic, Tumor, TOR Serine-Threonine Kinases, Human Genome, Q, Gastroenterology, PTEN Phosphohydrolase, Xenograft Model Antitumor Assays, Gene Expression Regulation, Neoplastic, Oncology, Gene Expression Regulation, Female, Mitogen-Activated Protein Kinases, Proto-Oncogene Proteins c-akt, RNA Helicases, Signal Transduction
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