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New Proteolysis Targeting Chimeras (PROTACs) offer a promising approach for ER+ breast cancer treatment. DNA-encoded chemical library screening identified novel ERα degraders, demonstrating efficacy in preclinical models.

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Area of Science:

  • Medicinal Chemistry
  • Molecular Biology
  • Oncology

Background:

  • Estrogen receptor alpha (ERα) signaling is a key driver in ER+ breast cancer.
  • Current ERα inhibitors like aromatase inhibitors, SERMs, and SERDs have limitations.
  • Novel therapeutic strategies targeting ERα are needed for improved breast cancer treatment.

Purpose of the Study:

  • To identify novel bispecific degraders of ERα using DNA-encoded chemical library (DECL) screening.
  • To evaluate the efficacy of these degraders in preclinical models of ER+ breast cancer.
  • To validate DECL screening as a method for discovering potent PROTACs.

Main Methods:

  • Screening of approximately 120 billion DNA-encoded molecules against ERα (wild-type and mutants).
  • Off-DNA synthesis and characterization of small molecule exemplars.
  • Rapid generation of bispecific degraders using click chemistry.
  • In vivo evaluation of PROTAC efficacy in a mouse xenograft model.

Main Results:

  • Identified exemplar 7 with nanomolar ERα binding, antagonism, and degradation.
  • Developed potent bispecific ERα degraders (PROTACs 18 and 21).
  • PROTACs 18 and 21 inhibited ER+ MCF7 tumor growth in vivo.
  • Demonstrated rapid generation of effective degraders with minimal optimization.

Conclusions:

  • DECL screening is an effective strategy for identifying novel ERα degraders.
  • Developed PROTACs show promise for treating ER+ breast cancer.
  • This approach facilitates the discovery of new therapeutic leads for cancer treatment.