title: Novel protein kinases expressed in human breast cancer.
abstract: The family of protein kinases includes many oncogenes and growth-factor receptors, as well as genes that are involved in cell-cycle regulation. We have identified protein kinases expressed in a human breast-cancer cell line, 600PEI, and a primary human breast carcinoma, using PCR cloning techniques based on consensus sequences in the kinase domain. Twenty-five different protein kinases were isolated, including 3 novel putative tyrosine kinases (designated TK1, TK2, and TK5), and 2 novel putative cell-cycle-associated serine/threonine kinases (designated STK1 and STK2). TK1 is a new member of the src family of kinases that is expressed predominantly in epithelial cells. TK2 is homologous to the receptor kinase, HEK, and TK5 appears to be another member of the JAK family of kinases. The novel serine/threonine kinases, designated STK1 and STK2, were homologous to the human cdc2 and the Aspergillus nimA genes. We subsequently analyzed the levels of expression of all of these protein kinases in a panel of human breast carcinomas, using PCR-based methods. This analysis revealed different expression profiles in different primary breast carcinomas and, therefore, may determine new molecular sub-sets of human breast cancer.
authors.affiliation: Department of Surgery, Lineberger Comprehensive Cancer Center, University of North Carolina School of Medicine, Chapel Hill 27599.
authors.forename: W G
authors.initials: WG
authors.lastname: Cance
authors.forename: R J
authors.initials: RJ
authors.lastname: Craven
authors.forename: T M
authors.initials: TM
authors.lastname: Weiner
authors.forename: E T
authors.initials: ET
authors.lastname: Liu
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D015152:Blotting, Northern; D001943:Breast Neoplasms / Q000737:chemistry*; D005260:Female; D006801:Humans; D008969:Molecular Sequence Data; D009363:Neoplasm Proteins / Q000032:analysis* / Q000737:chemistry; D009856:Oncogene Proteins, Viral / Q000032:analysis; D016133:Polymerase Chain Reaction; D011494:Protein Kinases / Q000032:analysis* / Q000737:chemistry; D018719:Erb-b2 Receptor Tyrosine Kinases; D014407:Tumor Cells, Cultured / Q000737:chemistry
chemical_list: D009363:Neoplasm Proteins; D009856:Oncogene Proteins, Viral; D011494:Protein Kinases; D018719:Erb-b2 Receptor Tyrosine Kinases