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Specific stereochemistry of OP-1074 disrupts estrogen receptor alpha helix 12 and confers pure antiestrogenic activity.

Abstract：

:Complex tissue-specific and cell-specific signaling by the estrogen receptor (ER) frequently leads to the development of resistance to endocrine therapy for breast cancer. Pure ER antagonists, which completely lack tissue-specific agonist activity, hold promise for preventing and treating endocrine resistance, however an absence of structural information hinders the development of novel candidates. Here we synthesize a small panel of benzopyrans with variable side chains to identify pure antiestrogens in a uterotrophic assay. We identify OP-1074 as a pure antiestrogen and a selective ER degrader (PA-SERD) that is efficacious in shrinking tumors in a tamoxifen-resistant xenograft model. Biochemical and crystal structure analyses reveal a structure activity relationship implicating the importance of a stereospecific methyl on the pyrrolidine side chain of OP-1074, particularly on helix 12.

journal_name

Nat Commun

journal_title

Nature communications

authors

Fanning SW,Hodges-Gallagher L,Myles DC,Sun R,Fowler CE,Plant IN,Green BD,Harmon CL,Greene GL,Kushner PJ

doi

10.1038/s41467-018-04413-3

subject

Has Abstract

pub_date

2018-06-18 00:00:00

pages

2368

issue

1

issn

2041-1723

pii

10.1038/s41467-018-04413-3

journal_volume

9

pub_type

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