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Caveolin-1 mediates cellular distribution of HER2 and affects trastuzumab binding and therapeutic efficacy

Patrícia M R Pereira1, Sai Kiran Sharma1, Lukas M Carter1

  • 1Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, NY, 10065, USA.

Nature Communications
|December 5, 2018
PubMed

Insights

Caveolin-1 (CAV1) protein influences HER2 receptor dynamics on cell membranes. Depleting CAV1 with lovastatin enhances trastuzumab binding and therapy effectiveness for HER2-positive tumors.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Trastuzumab therapy efficacy for HER2-positive tumors depends on HER2 receptor availability at the cell surface.
  • HER2 receptor dynamics, including endocytosis and recycling, affect its surface pool and drug binding.
  • Understanding HER2 cell membrane dynamics is crucial for optimizing trastuzumab treatment.

Purpose of the Study:

  • To investigate the role of caveolin-1 (CAV1) in HER2 cell membrane dynamics.
  • To determine if modulating CAV1 affects HER2 surface availability and trastuzumab binding.
  • To explore the therapeutic potential of targeting CAV1 for improving trastuzumab therapy.

Main Methods:

  • Utilized in vivo biological models and fresh human tumor cultures.
  • Investigated the involvement of caveolin-1 (CAV1) in HER2 receptor endocytosis.
  • Assessed the impact of temporal CAV1 depletion using lovastatin on HER2 cell membrane dynamics.

Main Results:

  • Identified caveolin-1 (CAV1) as a key protein regulating HER2 cell membrane dynamics.
  • Demonstrated that lovastatin-induced temporal CAV1 depletion increases HER2 half-life and surface availability.
  • Observed improved trastuzumab binding and enhanced therapeutic effects against HER2-positive tumors.

Conclusions:

  • Caveolin-1 (CAV1) plays a significant role in the effectiveness of trastuzumab therapy.
  • Modulating CAV1 levels can enhance HER2 receptor availability, improving trastuzumab binding.
  • Targeting CAV1 presents a potential strategy to optimize treatment for HER2-positive cancers.

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