title: Sequestosome 1/p62 facilitates HER2-induced mammary tumorigenesis through multiple signaling pathways.
abstract: Previous studies have shown that increased levels of the adaptor protein Sequestosome 1/p62 are observed in human breast cancers and significantly correlate with HER2 overexpression. However, the role of p62 in the pathophysiology of HER2-induced mammary tumorigenesis has not yet been investigated. In this study, we report that p62 facilitates HER2-mediated cell survival in both two-dimensional and three-dimensional cell culture and that HER2-induced cellular transformation requires p62, as well as NRF2, which is known to become stabilized by its release from Kelch-like ECH-associated protein 1 (KEAP1) via p62-KEAP1 interaction. In agreement with these results, genetic ablation of p62 delays HER2-induced mammary tumorigenesis in tumor cell allografts in nude mice, and in MMTV-Neu transgenic mice. We also report that ablation of p62 impairs AKT and β-catenin activation in association with PTEN (phosphatase and tensin homolog deleted on chromosome ten) accumulation, both in vitro and in vivo. Further in vivo studies suggest that loss of p62 also impairs NF-κB and NRF2 activation. Collectively, our results provide compelling evidence that p62 contributes to HER2-induced mammary tumorigenesis through multiple signaling pathways, including the PTEN/phosphoinositide-3-kinase/AKT axis, WNT/β-catenin signaling, the NF-κB pathway and the NRF2-KEAP1 axis, and offer novel insights into the potential role of p62 in the regulation of the tumor suppressor PTEN.
authors.affiliation: 1] Rutgers, The State University of New Jersey, New Brunswick, NJ, USA [2] Department of Medicine-Medical Oncology, Rutgers Cancer Institute of New Jersey, Rutgers, The State University of New Jersey, New Brunswick, NJ, USA.
authors.forename: X
authors.initials: X
authors.lastname: Cai-McRae
authors.affiliation: 1] Department of Medicine-Medical Oncology, Rutgers Cancer Institute of New Jersey, Rutgers, The State University of New Jersey, New Brunswick, NJ, USA [2] Department of Pathology and Laboratory Medicine, Rutgers Robert Wood Johnson Medical School, Piscataway, NJ, USA.
authors.forename: H
authors.initials: H
authors.lastname: Zhong
authors.affiliation: 1] Rutgers, The State University of New Jersey, New Brunswick, NJ, USA [2] Department of Medicine-Medical Oncology, Rutgers Cancer Institute of New Jersey, Rutgers, The State University of New Jersey, New Brunswick, NJ, USA [3] Division of Medical Oncology, Department of Internal Medicine, Rutgers Robert Wood Johnson Medical School, Piscataway, NJ, USA.
authors.forename: V
authors.initials: V
authors.lastname: Karantza
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000378:metabolism*; D000818:Animals; D001943:Breast Neoplasms / Q000378:metabolism / Q000473:pathology*; D018929:Cell Culture Techniques / Q000379:methods*; D045744:Cell Line, Tumor; D002470:Cell Survival; D002471:Cell Transformation, Neoplastic; D005260:Female; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins / Q000378:metabolism; D000072019:Kelch-Like ECH-Associated Protein 1; D061986:MCF-7 Cells; D051379:Mice; D008819:Mice, Nude; D008822:Mice, Transgenic; D051267:NF-E2-Related Factor 2 / Q000378:metabolism; D009368:Neoplasm Transplantation; D051059:PTEN Phosphohydrolase / Q000378:metabolism*; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000378:metabolism*; D000071456:Sequestosome-1 Protein; D015398:Signal Transduction
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D047908:Intracellular Signaling Peptides and Proteins; D000072019:Kelch-Like ECH-Associated Protein 1; D051267:NF-E2-Related Factor 2; D051059:PTEN Phosphohydrolase; D018719:Erb-b2 Receptor Tyrosine Kinases; D000071456:Sequestosome-1 Protein; C431364:KEAP1 protein, human; C495635:NFE2L2 protein, human; C099718:SQSTM1 protein, human; C508053:ERBB2 protein, human; C494929:PTEN protein, human
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