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Structural Consideration in Designing Organotin Polyethers to Arrest the Growth of Breast Cancer Cells In Vitro
Charles E Carraher1,2, Michael R Roner3, Kimberly Shahi4
1Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton, FL 33431, USA. carraher@fau.edu.
Abstract:
The ability to inhibit cancer is inherent in organotin materials yet the structural relationships that regulate/direct this activity remains unknown. We measured antitumor activity using a matched pair of cell lines MDA-MB-231 cells that are estrogen-independent, estrogen receptor negative and MCF-7 cells, a cell line that is estrogen receptor (ER) positive. Those polyethers that contained a O-phenyl unit were able to significantly inhibit the non-estrogen sensitive cell line but were much less effective against the estrogen sensitive cell line; that is, the human breast cancer cell line MDA-MB-231 showed better test results for polymers derived from diols containing the O-phenyl moiety than the breast cancer cell line MCF-7, a well-characterized estrogen receptor positive control cell line. Those polyethers that did not contain the O-phenyl unit inhibited both cell lines approximately the same. The differential activity of the O-phenyl-containing polyethers is likely due to the estrogen-sensitive cells combining with some of the organotin polyethers minimizing their ability to inhibit cell growth.
Insights
Organotin polyethers show potential for cancer inhibition. Those with O-phenyl units effectively target estrogen-independent cancer cells, unlike those without the O-phenyl group.
Area of Science:
- Materials Science
- Medicinal Chemistry
- Cancer Biology
Background:
- Organotin compounds possess inherent anticancer properties.
- The precise structural determinants of their antitumor activity are not fully understood.
- Understanding these relationships is crucial for developing targeted cancer therapies.
Purpose of the Study:
- To investigate the structure-activity relationships of organotin polyethers against cancer cells.
- To determine the differential efficacy of organotin polyethers based on structural modifications.
- To explore the role of estrogen receptors in the activity of these compounds.
Main Methods:
- Antitumor activity was assessed using two human breast cancer cell lines: MDA-MB-231 (estrogen-independent, estrogen receptor-negative) and MCF-7 (estrogen receptor-positive).
- Organotin polyethers with and without an O-phenyl unit were synthesized and tested.
- Cell viability assays were performed to measure the inhibition of cancer cell growth.
Main Results:
- Polyethers containing an O-phenyl unit demonstrated significant inhibition against estrogen-independent MDA-MB-231 cells.
- These O-phenyl-containing polyethers were less effective against estrogen-sensitive MCF-7 cells.
- Organotin polyethers lacking the O-phenyl unit showed similar inhibitory effects on both cell lines.
- The reduced efficacy against MCF-7 cells may be attributed to their interaction with estrogen receptors.
Conclusions:
- The presence of an O-phenyl moiety in organotin polyethers is critical for selective inhibition of estrogen-independent cancer cells.
- Estrogen receptor status significantly influences the efficacy of certain organotin polyethers.
- These findings provide insights into the design of novel organotin-based anticancer agents with targeted activity.
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