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Designed TPR modules as novel anticancer agents.

Aitziber L Cortajarena1, Fang Yi, Lynne Regan

  • 1Department of Molecular Biophysics & Biochemistry, Yale University, 266 Whitney Avenue, New Haven, Connecticut 06520, USA. lynne.regan@yale.edu

ACS Chemical Biology
|March 22, 2008
PubMed
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Researchers designed novel tetratetratricopeptide repeat modules that inhibit heat shock protein 90 (Hsp90) by outcompeting co-chaperones. This targeted Hsp90 inhibition significantly reduced HER2 levels and killed HER2-positive breast cancer cells.

Area of Science:

  • Molecular Biology
  • Oncology
  • Drug Discovery

Background:

  • Heat shock protein 90 (Hsp90) is a molecular chaperone crucial for the stability and function of numerous oncogenic proteins.
  • Hsp90 client proteins, such as HER2, are essential for the proliferation and survival of various cancer types, making Hsp90 a significant therapeutic target.
  • Modulating protein-protein interactions offers a promising strategy for developing novel anticancer agents.

Purpose of the Study:

  • To design and characterize novel molecular modules targeting the C-terminus of Hsp90.
  • To investigate the potential of these modules to inhibit Hsp90 function by outcompeting endogenous co-chaperones.
  • To evaluate the therapeutic efficacy of Hsp90 inhibition using these modules in HER2-positive breast cancer models.

Main Methods:

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  • Design and synthesis of novel tetratetratricopeptide repeat (TTR) modules.
  • Biochemical characterization of TTR module binding affinity and specificity to Hsp90.
  • In vitro and in cell-based assays to assess Hsp90 inhibition and its downstream effects.
  • Evaluation of cancer cell viability and oncogenic protein levels following TTR module treatment.

Main Results:

  • Engineered TTR modules demonstrated high affinity and specificity for the C-terminus of Hsp90.
  • These modules effectively out-competed natural Hsp90 co-chaperones, leading to significant inhibition of Hsp90 activity.
  • Hsp90 inhibition resulted in a substantial decrease in HER2 protein levels.
  • Treatment with TTR modules led to the selective killing of BT474 HER2-positive breast cancer cells.

Conclusions:

  • Novel TTR modules represent a new class of Hsp90 inhibitors with potential as anticancer agents.
  • These modules provide valuable tools for dissecting the role of Hsp90 in protein folding and cancer progression.
  • Targeting Hsp90 through competitive binding of engineered modules offers a promising therapeutic strategy for HER2-positive breast cancers.