OBJECTIVE: We previously identified a protein, Brx, that interacted with estrogen receptor alpha. Sequence analysis determined that Brx is a novel member of the Dbl family of oncoproteins involved in signaling pathways that regulate cell growth. Because the Brx protein was found to be highly expressed in hormoneresponsive breast epithelium, the objective of this study was to determine whether Brx was expressed in both normal and neoplastic ovarian tissues. STUDY DESIGN: A polyclonal antiserum directed against the Brx protein was used to perform immunolocalization on sections from 5 normal ovaries and 20 ovarian neoplasms. Chromosomal localization of the brx gene was accomplished by means of fluorescence in situ hybridization. Northern and Western blot analyses were performed on extracts prepared from human ovaries. RESULTS: Brx protein was localized to the cytoplasm of granulosa cells from mature graafian follicles, the corpus luteum, and islands of hilar cells in normal ovaries. In tumors with low malignant potential and ovarian carcinomas the neoplastic epithelium stained strongly for Brx protein. Northern and Western blot analyses, respectively, confirmed expression of Brx messenger ribonucleic acid and protein in normal ovary. Finally, the brx gene was localized to 15q25. CONCLUSION: The proto-oncogene brx is expressed in specific normal human ovarian tissues and is also present in ovarian epithelial neoplasms.
OBJECTIVE: We previously identified a protein, Brx, that interacted with estrogen receptor alpha. Sequence analysis determined that Brx is a novel member of the Dbl family of oncoproteins involved in signaling pathways that regulate cell growth. Because the Brx protein was found to be highly expressed in hormoneresponsive breast epithelium, the objective of this study was to determine whether Brx was expressed in both normal and neoplastic ovarian tissues. STUDY DESIGN: A polyclonal antiserum directed against the Brx protein was used to perform immunolocalization on sections from 5 normal ovaries and 20 ovarian neoplasms. Chromosomal localization of the brx gene was accomplished by means of fluorescence in situ hybridization. Northern and Western blot analyses were performed on extracts prepared from humanovaries. RESULTS:Brx protein was localized to the cytoplasm of granulosa cells from mature graafian follicles, the corpus luteum, and islands of hilar cells in normal ovaries. In tumors with low malignant potential and ovarian carcinomas the neoplastic epithelium stained strongly for Brx protein. Northern and Western blot analyses, respectively, confirmed expression of Brx messenger ribonucleic acid and protein in normal ovary. Finally, the brx gene was localized to 15q25. CONCLUSION: The proto-oncogene brx is expressed in specific normal human ovarian tissues and is also present in ovarian epithelial neoplasms.
Authors: Sinnie Sin Man Ng; Soledad Jorge; Minnie Malik; Joy Britten; Szu-Chi Su; Charles R Armstrong; Joshua T Brennan; Sydney Chang; Kimberlyn Maravet Baig; Paul H Driggers; James H Segars Journal: J Clin Endocrinol Metab Date: 2019-03-01 Impact factor: 5.958
Authors: Rebecca Rogers; John Norian; Minnie Malik; Gregory Christman; Mones Abu-Asab; Faye Chen; Casey Korecki; James Iatridis; William H Catherino; Rocky S Tuan; Namisha Dhillon; Phyllis Leppert; James H Segars Journal: Am J Obstet Gynecol Date: 2008-04 Impact factor: 8.661
Authors: K Maravet Baig; Szu-Chi Su; Sunni L Mumford; Emma Giuliani; Sinnie Sin Man Ng; Charles Armstrong; Margaret F Keil; Kamaria Cayton Vaught; Nils Olsen; Elyse Pettiford; Irina Burd; James H Segars Journal: Brain Res Bull Date: 2018-04-10 Impact factor: 3.715