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An M(r) 7-kDa membrane protein overexpressed in human multidrug-resistant ovarian cancer cells
1Department of Biochemistry, Faculty of Medicine, Laval University, Ste-Foy, Québec, Canada.
Abstract:
We have developed a monoclonal antibody (designated 1D7) which recognizes an M(r) 7-kDa plasma membrane protein overexpressed in ovarian MDR cancer cells. The expression of the M(r) 7-kDa protein in various human multidrug-resistant and drug-sensitive cell lines was analysed by Western blot and flow cytometry methods. The small molecular weight protein was overexpressed in the human ovarian carcinoma cell line, SKVLB which was selected for vinblastine resistance from SKOV3 cells and in OVCAR 4/ADR100 and OVCAR 4/VBL200 which were generated from NIH:OVCAR4 by stepwise selection against adriamycin and vinblastine, respectively. Only a minor amount of the M(r) 7-kDa protein was found in the parent cell line, SKOV3. It was not found in other drug-resistant human cell lines such as the vinblastine-resistant CEM cells (CEM/VLB300), the intrinsic MDR colon cell line HCT15 and the human MDR breast cancer cell line, MCF7/AdrVp. 1D7 specifically inhibited the proliferation of the resistant cells. Our results suggest that the expression of the M(r) 7-kDa protein on the plasma membrane of ovarian MDR cancer cells may be involved in a mechanism related to the proliferation of the drug resistant cancer cells.
Insights
A new monoclonal antibody, 1D7, targets a 7-kDa protein overexpressed in multidrug-resistant (MDR) ovarian cancer cells. This protein
Area of Science:
- Oncology
- Molecular Biology
- Immunology
Background:
- Multidrug resistance (MDR) in ovarian cancer poses a significant clinical challenge.
- Identifying novel biomarkers and therapeutic targets for MDR cancers is crucial.
Purpose of the Study:
- To develop a monoclonal antibody targeting a protein overexpressed in drug-resistant ovarian cancer cells.
- To investigate the role of a 7-kDa plasma membrane protein in ovarian MDR.
Main Methods:
- Western blot and flow cytometry were used to analyze protein expression in various cell lines.
- Development and application of a novel monoclonal antibody (1D7).
Main Results:
- A 7-kDa plasma membrane protein was significantly overexpressed in specific vinblastine- and adriamycin-resistant ovarian cancer cell lines (SKVLB, OVCAR 4/ADR100, OVCAR 4/VBL200).
- This protein was minimally expressed in the parent drug-sensitive cell line (SKOV3) and absent in other tested drug-resistant cell lines.
- The 1D7 antibody specifically inhibited the proliferation of the resistant ovarian cancer cells.
Conclusions:
- The M(r) 7-kDa protein is a potential biomarker for ovarian MDR.
- Targeting this protein with the 1D7 antibody shows promise for overcoming drug resistance in ovarian cancer.