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Heat shock protein 90.

Len Neckers1, S Percy Ivy

  • 1Urologic Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Rockville, Maryland 20850, USA. len@helix.nih.gov

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Summary
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Heat shock protein 90 (Hsp90) inhibitors target multiple cancer survival pathways by degrading client proteins. This approach shows promise for overcoming drug resistance and enhancing cancer treatment efficacy, alone or combined with chemotherapy.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Drug Discovery

Background:

  • Heat shock protein 90 (Hsp90) is a molecular chaperone crucial for cancer cell growth and survival.
  • Hsp90 clients include signaling proteins like Akt, Her2, and HIF-1 alpha, which are vital for tumor progression.
  • Targeting Hsp90 offers a unique strategy to simultaneously disrupt multiple cancer-promoting pathways.

Purpose of the Study:

  • To review the role of Hsp90 inhibitors in cancer therapy.
  • To highlight the potential of Hsp90 inhibitors in overcoming drug resistance.
  • To explore the combination of Hsp90 inhibitors with conventional chemotherapeutic agents.

Main Methods:

  • Review of preclinical and clinical studies on Hsp90 inhibitors.
  • Analysis of Hsp90 client proteins and their role in cancer survival pathways.
  • Evaluation of the therapeutic potential of Hsp90 inhibition in various cancer types.

Main Results:

  • Hsp90 inhibitors destabilize and degrade key cancer-promoting client proteins.
  • Inhibition of Hsp90 has shown significant antitumor activity in preclinical models.
  • Hsp90 inhibitors demonstrate potential in treating leukemias and lymphomas by targeting mutated kinases and androgen receptors.

Conclusions:

  • Hsp90 inhibitors can overcome cancer cell genetic plasticity and evade drug resistance.
  • Mechanism-based use of Hsp90 inhibitors, alone or in combination, can enhance cancer treatment outcomes.
  • Hsp90 inhibition represents a promising therapeutic strategy for diverse forms of cancer.