Expression of brx proto-oncogene in normal ovary and in epithelial ovarian neoplasms

Bradley T. Miller, Domenica M. Rubino, Paul H. Driggers, Bassem Haddad, Margaret Cisar, Karen Gray, James H. Segars

Research output: Contribution to journalArticlepeer-review


OBJECTIVE: We previously identified a protein, Brx, that interacted with estrogen receptor α. 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 hormone-responsive 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.

Original languageEnglish (US)
Pages (from-to)286-295
Number of pages10
JournalAmerican journal of obstetrics and gynecology
Issue number2
StatePublished - 2000
Externally publishedYes


  • Brx
  • Cdc42
  • Estrogen receptor α
  • Guanosine triphosphate-binding proteins
  • Oncogene
  • Ovarian carcinoma
  • Ovary

ASJC Scopus subject areas

  • Obstetrics and Gynecology


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