title: Deregulation of p27 by oncogenic signaling and its prognostic significance in breast cancer.
abstract: p27 is a key regulator of progression from G1 to S phase. Although the gene encoding p27 is rarely mutated in human cancers, p27 is functionally inactivated in a majority of human cancers through accelerated p27 proteolysis, through sequestration by cyclin D-cyclin-dependent kinase complexes and by cytoplasmic mislocalization. Here we review mechanisms whereby oncogenic activation of receptor tyrosine kinase and Ras pathways lead to accelerated p27 proteolysis and p27 mislocalization in cancer cells. The prognostic significance of p27 in human breast cancer is also reviewed.
authors.affiliation: Braman Breast Cancer Institute, University of Miami School of Medicine, Miami, FL, USA.
authors.forename: Angel
authors.initials: A
authors.lastname: Alkarain
authors.forename: Joyce
authors.initials: J
authors.lastname: Slingerland
mesh_terms: D001943:Breast Neoplasms / Q000235:genetics / Q000378:metabolism / Q000473:pathology*; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism*; D050760:Cyclin-Dependent Kinase Inhibitor p27; D018844:Cyclin-Dependent Kinases / Q000378:metabolism; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism; D011379:Prognosis; D015398:Signal Transduction; D016019:Survival Analysis; D025521:Tumor Suppressor Proteins / Q000235:genetics / Q000378:metabolism*; D018631:ras Proteins / Q000378:metabolism
chemical_list: D018797:Cell Cycle Proteins; D025521:Tumor Suppressor Proteins; D050760:Cyclin-Dependent Kinase Inhibitor p27; D019869:Phosphatidylinositol 3-Kinases; D018844:Cyclin-Dependent Kinases; D018631:ras Proteins