Resistance to endocrine therapies remains a major clinical problem for the treatment of estrogen receptor-α (ERα)-positive breast cancer. On-target side effects limit therapeutic compliance and use for chemoprevention, highlighting an unmet need for new therapies ...
Resistance to endocrine therapies remains a major clinical problem for the treatment of estrogen receptor-α (ERα)-positive breast cancer. On-target side effects limit therapeutic compliance and use for chemoprevention, highlighting an unmet need for new therapies. Here we present a full-antagonist ligand series lacking the prototypical ligand side chain that has been universally used to engender antagonism of ERα through poorly understood structural mechanisms. A series of crystal structures and phenotypic assays reveal a structure-based design strategy with separate design elements for antagonism and degradation of the receptor, and access to a structurally distinct space for further improvements in ligand design. Understanding structural rules that guide ligands to produce diverse ERα-mediated phenotypes has broad implications for the treatment of breast cancer and other estrogen-sensitive aspects of human health including bone homeostasis, energy metabolism, and autoimmunity.
Organizational Affiliation:
Department of Cancer Biology, The Scripps Research Institute, Jupiter, Florida, USA.
(1S,2R,4S)-N-(2-chlorophenyl)-5,6-bis(4-hydroxyphenyl)-N-methyl-7-oxabicyclo[2.2.1]hept-5-ene-2-sulfonamide C25 H22 Cl N O5 S UOCUJSGNIGCJMB-SGIRGMQISA-N
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