title: Protein tyrosine phosphatase 1B deficiency or inhibition delays ErbB2-induced mammary tumorigenesis and protects from lung metastasis.
abstract: We investigated the role of protein tyrosine phosphatase 1B (PTP1B) in mammary tumorigenesis using both genetic and pharmacological approaches. It has been previously shown that transgenic mice with a deletion mutation in the region of Erbb2 encoding its extracellular domain (referred to as NDL2 mice, for 'Neu deletion in extracellular domain 2') develop mammary tumors that progress to lung metastasis. However, deletion of PTP1B activity in the NDL2 transgenic mice either by breeding with Ptpn1-deficient mice or by treatment with a specific PTP1B inhibitor results in significant mammary tumor latency and resistance to lung metastasis. In contrast, specific overexpression of PTP1B in the mammary gland leads to spontaneous breast cancer development. The regulation of ErbB2-induced mammary tumorigenesis by PTB1B occurs through the attenuation of both the MAP kinase (MAPK) and Akt pathways. This report provides a rationale for the development of PTP1B as a new therapeutic target in breast cancer.
authors.affiliation: McGill Cancer Centre, McGill University, 3655 Sir William Osler Promenade, Montreal, Quebec H3G 1Y6, Canada.
authors.forename: Sofi G
authors.initials: SG
authors.lastname: Julien
authors.forename: Nadia
authors.initials: N
authors.lastname: Dubé
authors.forename: Michelle
authors.initials: M
authors.lastname: Read
authors.forename: Janice
authors.initials: J
authors.lastname: Penney
authors.forename: Marilene
authors.initials: M
authors.lastname: Paquet
authors.forename: Yongxin
authors.initials: Y
authors.lastname: Han
authors.forename: Brian P
authors.initials: BP
authors.lastname: Kennedy
authors.forename: William J
authors.initials: WJ
authors.lastname: Muller
authors.forename: Michel L
authors.initials: ML
authors.lastname: Tremblay
mesh_terms: D000818:Animals; D017209:Apoptosis; D045744:Cell Line, Tumor; D015536:Down-Regulation; D005260:Female; D008168:Lung / Q000378:metabolism; D008175:Lung Neoplasms / Q000378:metabolism / Q000517:prevention & control / Q000556:secondary*; D020935:MAP Kinase Signaling System / Q000502:physiology; D008321:Mammary Glands, Animal / Q000187:drug effects; D008325:Mammary Neoplasms, Experimental / Q000201:enzymology* / Q000209:etiology / Q000473:pathology; D051379:Mice; D018345:Mice, Knockout; D008822:Mice, Transgenic; D008969:Molecular Sequence Data; D010641:Phenotype; D054562:Protein Tyrosine Phosphatase, Non-Receptor Type 1; D017027:Protein Tyrosine Phosphatases / Q000037:antagonists & inhibitors* / Q000235:genetics / Q000502:physiology; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000378:metabolism*; D020893:Receptor, ErbB-3 / Q000378:metabolism; D015398:Signal Transduction
chemical_list: D054562:Protein Tyrosine Phosphatase, Non-Receptor Type 1; D017027:Protein Tyrosine Phosphatases; D051057:Proto-Oncogene Proteins c-akt; D018719:Erb-b2 Receptor Tyrosine Kinases; D020893:Receptor, ErbB-3; C516609:Ptpn1 protein, mouse