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Using quantitative single molecule localization microscopy to optimize multivalent HER2-targeting ligands.

Devin L Wakefield1, Ottavia Golfetto1, Raphael Jorand1

  • 1Department of Cancer Biology and Molecular Medicine, Beckman Research Institute, Duarte, CA, United States.

Frontiers in Medicine
|May 4, 2023
PubMed
Summary
This summary is machine-generated.

Combining trastuzumab and pertuzumab antibodies enhances HER2 receptor clustering in breast cancer cells. This approach, using advanced protein engineering, shows promise for developing novel HER2-targeted therapies.

Keywords:
HER2meditopepertuzumabsingle molecule localization microscopytrastuzumabvalency

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Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • HER2-positive metastatic breast cancer treatment often involves targeting the HER2 receptor.
  • Trastuzumab and pertuzumab are monoclonal antibodies that target HER2 but have distinct mechanisms.
  • The combination of trastuzumab and pertuzumab improves progression-free survival in patients.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying the efficacy of combined HER2-targeted antibodies.
  • To assess and optimize the clustering of HER2 receptors using protein engineering and quantitative single molecule localization microscopy (qSMLM).
  • To evaluate the impact of antibody-mediated HER2 clustering on downstream signaling pathways.

Main Methods:

  • Utilized quantitative single molecule localization microscopy (qSMLM) to visualize and quantify HER2 clustering in breast cancer cells.
  • Engineered multivalent ligands, including meditope technology, to enhance HER2 receptor aggregation.
  • Assessed the effects of different antibody formats (monovalent Fab, individual mAbs, mAb combinations, multivalent ligands) on HER2 organization.
  • Measured the inhibition of epidermal growth factor (EGF)-dependent downstream kinase activation.

Main Results:

  • Individual antibodies (trastuzumab or pertuzumab) significantly increased HER2 clustering compared to a monovalent Fab fragment.
  • The combination of trastuzumab and pertuzumab induced the highest level of HER2 clustering.
  • Engineered multivalent ligands, in combination with trastuzumab, further enhanced HER2 clustering.
  • Meditope-based combinations showed greater early inhibition of EGF-dependent kinase activation compared to trastuzumab plus pertuzumab.

Conclusions:

  • Monoclonal antibodies (mAbs) and multivalent ligands can effectively modulate HER2 receptor organization and activation.
  • Enhanced HER2 clustering by therapeutic agents may represent a key mechanism for improved treatment efficacy.
  • The developed approach holds potential for the future design of novel HER2-targeted cancer therapeutics.