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BAG-1 expression in normal and neoplastic endometrium.
T Moriyama1, R D Littell, R Debernardo
1Vincent Center for Reproductive Biology, Massachusetts General Hospital Boston, Boston, MA 02114, USA.
Gynecologic Oncology
|August 7, 2004
Summary
BAG-1 protein is present in endometrial tissue. High-grade endometrial cancers show increased BAG-1 expression, suggesting it may be a prognostic indicator for this cancer.
Area of Science:
- Oncology
- Molecular Biology
- Gynecologic Pathology
Background:
- The BCL-2-associated athanogene 1 (BAG-1) protein exhibits anti-apoptotic properties and interacts with BCL-2 and steroid receptors.
- Elevated BAG-1 levels are associated with prognosis in breast cancer, but its role in endometrial cancer is not well-defined.
Purpose of the Study:
- To investigate the expression of BAG-1 in normal endometrium, precancerous lesions, and endometrial cancers.
- To determine if BAG-1 expression correlates with tumor grade and steroid receptor status in endometrial cancer.
Main Methods:
- Immunohistochemical analysis of BAG-1 expression in endometrial tissue samples, including proliferative endometrium, secretory endometrium, low-grade neoplastic lesions, and high-grade endometrial adenocarcinomas.
- Western blot analysis to assess BAG-1 levels in endometrial cancer cell lines representing different grades.
Main Results:
- High-grade endometrial cancers demonstrated significantly higher positive staining for both cytoplasmic and nuclear BAG-1 compared to secretory endometrium.
- No significant correlation was found between nuclear BAG-1 expression and estrogen or progesterone receptor status.
- BAG-1 was expressed across all evaluated endometrial cancer cell lines with no significant difference in total BAG-1 levels.
Conclusions:
- BAG-1 is expressed in the human endometrium.
- Increased expression of BAG-1 in high-grade endometrial cancers suggests a potential role as a prognostic biomarker.