The broad, long-term objective of this proposal is the development of new and more effective therapeutic agents for the treatment of breast cancer by enhancing the understanding of one of the key interactions between 17alpha-substituted estrogens and the ER-Hormone Binding Domain.
The specific aims for this project are: 1). the synthesis of four selected series of high affinity estradiols, 2). the determination of their molecular conformation, 3). the determination of receptor affinity and activity, 4). correlation of observed biological responses with the calculated ligand-receptor structure, especially the AF-2 (helix 12) region, 5). iterative ligand design and refinement of the hypothesis. The health relatedness of this project is that it will contribute to the development of better therapeutic agents for breast cancer in women and expand the understanding of the steps in the estrogenic response. The research design begins with the underlying hypothesis which proposes that appropriately 17alpha-substituted estrogens interact with the critical helix 12 of the receptor. The synthetic chemistry yields new compounds (probes) which undergo both conformational analyses and biological assays. These results are evaluated, leading to improved ligands and/or a refined hypothesis. These steps will utilize: 1). stereochemically controlled and versatile synthetic methods, 2). determination of ligand conformations by using high field NMR correlations and molecular modeling, 3). competitive receptor binding and functional assays to determine biological properties, and 4). quantitative-structure activity relationships and molecular docking to correlate the observed and predicted results. The conclusions will aid in the design of better second generation ligands and the development of a better hypothesis for the interactions of the hormone-receptor-effector complex.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
5R01CA081049-02
Application #
6164306
Study Section
Reproductive Endocrinology Study Section (REN)
Program Officer
Sathyamoorthy, Neeraja
Project Start
1999-05-01
Project End
2003-02-28
Budget Start
2000-03-01
Budget End
2001-02-28
Support Year
2
Fiscal Year
2000
Total Cost
$177,960
Indirect Cost
Name
Northeastern University
Department
Other Health Professions
Type
Schools of Pharmacy
DUNS #
039318308
City
Boston
State
MA
Country
United States
Zip Code
02115
Hanson, Robert N; Tongcharoensirikul, Pakamas; Barnsley, Kelton et al. (2015) Synthesis and evaluation of 2-halogenated-1,1-bis(4-hydroxyphenyl)-2-(3-hydroxyphenyl)-ethylenes as potential estrogen receptor-targeted radiodiagnostic and radiotherapeutic agents. Steroids 96:50-62
Hanson, Robert N; Hua, Edward; Hendricks, J Adam et al. (2012) Synthesis and evaluation of 11?-(4-substituted phenyl) estradiol analogs: transition from estrogen receptor agonists to antagonists. Bioorg Med Chem 20:3768-80
Hanson, Robert N; McCaskill, Emmett; Tongcharoensirikul, Pakamas et al. (2012) Synthesis and evaluation of 17?-(dimethylphenyl)vinyl estradiols as probes of the estrogen receptor-? ligand binding domain. Steroids 77:471-6
Olmsted, Sandra L; Tongcharoensirikul, Pakamas; McCaskill, Emmett et al. (2012) Synthesis and evaluation of 17?-E-20-(heteroaryl)norpregn-1,3,5(10),20 tetraene-3,17?-diols [17?-(heteroaryl)vinyl estradiols] as ligands for the estrogen receptor-? ligand binding domain (ER?-LBD). Bioorg Med Chem Lett 22:977-9
Haddad, Terra; Gershman, Rachel; Dilis, Robert et al. (2012) Synthesis and evaluation of 4-(substituted styryl/alkenyl)-3,5-bis(4-hydroxyphenyl)-isoxazoles as ligands for the estrogen receptor. Bioorg Med Chem Lett 22:5999-6003
Hanson, Robert N; Kirss, Rein; McCaskill, Emmett et al. (2012) Targeting the estrogen receptor with metal-carbonyl derivatives of estradiol. Bioorg Med Chem Lett 22:1670-3
Hanson, Robert N; Hua, Edward; Labaree, David et al. (2012) Convergent synthesis of a steroidal antiestrogen-mitomycin C hybrid using ""click"" chemistry. Org Biomol Chem 10:8501-8
Hanson, Robert N; Tongcharoensirikul, Pakamas; Dilis, Robert et al. (2007) Synthesis and evaluation of isomeric (17alpha,20E)-11beta-methoxy-21-(trifluoromethylphenyl)-19-norpregna-1,3,5(10),20-tetraene-3,17beta-diols as ERalpha-hormone binding domain ligands: effect of the methoxy group on receptor binding and uterotrophic grow J Med Chem 50:472-9
Nettles, Kendall W; Bruning, John B; Gil, German et al. (2007) Structural plasticity in the oestrogen receptor ligand-binding domain. EMBO Rep 8:563-8
Hanson, Robert N; Friel, Carolyn J; Dilis, Robert et al. (2005) Synthesis and evaluation of (17alpha,20Z)-21-(4-substituted-phenyl)-19-norpregna-1,3,5(10),20-tetraene-3,17beta-diols as ligands for the estrogen receptor-alpha hormone binding domain: comparison with 20E-isomers. J Med Chem 48:4300-11

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