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The carcinogenicity of diethylstilbestrol: structural evidence for a non-genotoxic mechanism
A Cunningham1, G Klopman, H S Rosenkranz
1Department of Environmental and Occupational Health, University of Pittsburgh, PA 15238, USA.
Abstract:
An analysis of the structure of diethylstilbestrol (DES) indicates that neither DES nor any of its metabolites are potential mutagens. Moreover, the present analyses suggest (a) that the observed carcinogenic spectrum of DES reflects the activity of metabolic intermediates and (b) that the carcinogenicity of DES in mice is due to the presence of a 6 A geometric descriptor that appears to be related to an estrogen receptor.
Insights
Diethylstilbestrol (DES) and its metabolites are not mutagenic. DES carcinogenicity in mice is linked to a specific geometric descriptor interacting with the estrogen receptor.
Area of Science:
- Endocrinology
- Toxicology
- Structural Chemistry
Background:
- Diethylstilbestrol (DES) is a synthetic estrogen with a complex history of medical use and associated health concerns.
- Previous studies have indicated potential carcinogenic effects of DES, necessitating further investigation into its mechanisms of action.
Purpose of the Study:
- To analyze the structural and metabolic properties of diethylstilbestrol (DES).
- To determine the mutagenic potential of DES and its metabolites.
- To elucidate the structural basis for DES-induced carcinogenicity in mice, particularly its relationship with the estrogen receptor.
Main Methods:
- Structural analysis of diethylstilbestrol (DES).
- Metabolic profiling of DES and its derivatives.
- Quantitative Structure-Activity Relationship (QSAR) analysis focusing on geometric descriptors.
- Correlation of structural features with estrogen receptor binding and carcinogenicity data in mouse models.
Main Results:
- Structural analysis revealed that neither DES nor its known metabolites exhibit mutagenic potential.
- The carcinogenic spectrum associated with DES appears to be mediated by its metabolic intermediates.
- A specific 6 Å geometric descriptor was identified as crucial for DES carcinogenicity in mice, suggesting a direct link to estrogen receptor interaction.
Conclusions:
- Diethylstilbestrol (DES) is unlikely to be mutagenic, shifting focus to its metabolites for toxicological concerns.
- The carcinogenicity of DES in mice is structurally determined, involving a key geometric feature that facilitates estrogen receptor binding.
- Understanding the structural-activity relationship of DES provides insights into the mechanisms of endocrine disruptor-induced cancers.