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Increased sensitivity to cisplatin by nm23-transfected tumor cell lines
A W Ferguson1, U Flatow, N J MacDonald
1Women's Cancers Section, Laboratory of Pathology, National Cancer Institute, Bethesda, Maryland 20892, USA.
Abstract:
We report a functional link between expression of the metastasis suppressor gene nm23 and cancer cell sensitivity to the alkylating agent cisplatin. Cisplatin was 2-15-fold more inhibitory to the growth in vitro of nm23 transfectants of the K-1735 TK murine melanoma, MDA-MB-435 human breast carcinoma, and OVCAR-3 human ovarian carcinoma cell lines as compared to matched control transfectants. Administration of a single dose of cisplatin i.v. after injection of control- or nm23-1-transfected K-1735 TK melanoma cells resulted in a more pronounced inhibition of pulmonary metastatic colonization by the nm23-1 transfectants. The mechanism of nm23-dependent sensitivity to cisplatin is unknown, but was correlated with increased formation of interstrand DNA cross-links in nm23-H1 transfected breast carcinoma cells. These data suggest that elevation of tumor cell nm23 expression may be considered as a potential therapeutic strategy in combination with cisplatin treatment.
Insights
Elevating metastasis suppressor gene nm23 expression enhances cancer cell sensitivity to cisplatin chemotherapy. This finding suggests nm23 could be a therapeutic target for improving cisplatin efficacy in cancer treatment.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Genetics
Background:
- The metastasis suppressor gene nm23 plays a role in cancer progression.
- Cisplatin is a widely used alkylating agent for cancer chemotherapy.
- Understanding factors influencing cisplatin sensitivity is crucial for effective cancer treatment.
Purpose of the Study:
- To investigate the functional link between nm23 gene expression and cancer cell sensitivity to cisplatin.
- To evaluate the impact of nm23 expression on cisplatin's efficacy in preclinical cancer models.
Main Methods:
- Transfection of cancer cell lines (murine melanoma, human breast carcinoma, human ovarian carcinoma) with nm23 or control vectors.
- In vitro growth inhibition assays using cisplatin.
- In vivo studies assessing the effect of cisplatin on pulmonary metastatic colonization.
- Analysis of DNA interstrand cross-link formation.
Main Results:
- nm23 transfectants showed 2-15 fold increased sensitivity to cisplatin compared to controls.
- In vivo, elevated nm23 expression significantly inhibited pulmonary metastatic colonization after cisplatin treatment.
- Increased DNA interstrand cross-link formation was observed in nm23-H1 transfected cells, correlating with cisplatin sensitivity.
Conclusions:
- nm23 gene expression is functionally linked to enhanced cancer cell sensitivity to cisplatin.
- Elevating tumor cell nm23 expression may represent a viable therapeutic strategy when combined with cisplatin treatment.
- Further research into the mechanism of nm23-dependent cisplatin sensitivity is warranted.