title: The UPS: a promising target for breast cancer treatment.
abstract: During the past decade, progress in endocrine therapy and the use of trastuzumab has significantly contributed to the decline in breast cancer mortality for hormone receptor-positive and ERBB2 (HER2)-positive cases, respectively. As a result of these advances, a breast cancer cluster with poor prognosis that is negative for the estrogen receptor (ESR1), the progesterone receptor (PRGR) and ERBB2 (triple negative) has come to the forefront of medical therapeutic attention. DNA microarray analyses have revealed that this cluster is phenotypically most like the basal-like breast cancer that is caused by deficiencies in the BRCA1 pathways. To gain further improvements in breast cancer survival, new types of drugs might be required, and small molecules targeting the ubiquitin proteasome system have moved into the spotlight. The success of bortezomib in the treatment of multiple myeloma has sent encouraging signals that proteasome inhibitors could be used to treat other types of cancers. In addition, ubiquitin E3s involved in ESR1, ERBB2 or BRCA1 pathways could be ideal targets for therapeutic intervention. This review summarizes the ubiquitin proteasome pathways related to these proteins and discusses the possibility of new drugs for the treatment of breast cancers. PUBLICATION HISTORY : Republished from Current BioData's Targeted Proteins database (TPdb; http://www.targetedproteinsdb.com).
authors.affiliation: Division of Breast and Endocrine Surgery, St Marianna University School of Medicine, Kawasaki, 216-8511, Japan.
authors.forename: Ko
authors.initials: K
authors.lastname: Sato
authors.forename: Eeson
authors.initials: E
authors.lastname: Rajendra
authors.forename: Tomohiko
authors.initials: T
authors.lastname: Ohta
mesh_terms: D000818:Animals; D019313:BRCA1 Protein / Q000378:metabolism; D001943:Breast Neoplasms / Q000188:drug therapy* / Q000378:metabolism*; D005260:Female; D053263:Gene Regulatory Networks; D018773:Genes, erbB-1; D018734:Genes, erbB-2; D006801:Humans; D046988:Proteasome Endopeptidase Complex / Q000378:metabolism*; D061988:Proteasome Inhibitors; D015398:Signal Transduction; D025801:Ubiquitin / Q000378:metabolism*
chemical_list: D019313:BRCA1 Protein; D061988:Proteasome Inhibitors; D025801:Ubiquitin; D046988:Proteasome Endopeptidase Complex