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Updated: Apr 17, 2026

Initial Evaluation of Antibody-conjugates Modified with Viral-derived Peptides for Increasing Cellular Accumulation and Improving Tumor Targeting
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Intracellular delivery system for antibody-Peptide drug conjugates

Geoffrey Y Berguig1, Anthony J Convertine2, Shani Frayo3

  • 1Department of Bioengineering, University of Washington, Seattle, Washington, USA; Current address: BioMarin Pharmaceutical, Novato, California, USA.

Molecular Therapy : the Journal of the American Society of Gene Therapy
|February 12, 2015
PubMed

Insights

Researchers developed a novel polymeric micelle delivery system for enhanced cytosolic delivery of protein drugs, expanding antibody-drug conjugate therapy potential for cancer treatment. This system successfully suppressed tumor growth and prolonged survival in a lymphoma mouse model.

Area of Science:

  • Biotechnology and Nanomedicine
  • Cancer Therapy and Drug Delivery

Background:

  • Current antibody-drug conjugates (ADCs) face limitations due to intracellular delivery barriers, restricting their therapeutic potential.
  • Intracellular protein drugs offer enhanced selectivity for targeting dysregulated pathways in various cancers, but effective delivery remains a challenge.

Purpose of the Study:

  • To develop a multifunctional polymeric delivery system for enhanced cytosolic delivery of protein drugs.
  • To improve the safety, pharmacokinetics, and tumor biodistribution of antibody-drug conjugates.
  • To explore new therapeutic strategies targeting intracellular pathways in hematologic cancers and other malignancies.

Main Methods:

  • Development of a pH-responsive polymeric micelle carrier.
  • Incorporation of endosomal-releasing activity, antibody targeting (anti-CD22 monoclonal antibody), and a biocompatible ethylene glycol component.
  • In vivo evaluation in a xenograft mouse model of human B-cell lymphoma using a proapoptotic Bcl-2 interacting mediator (BIM) peptide drug.

Main Results:

  • The delivery system effectively delivered the BIM peptide drug into cancer cells.
  • Suppressed tumor growth throughout the treatment duration and significantly prolonged survival in the lymphoma mouse model.
  • Demonstrated correlation between antitumor activity and induction of cleaved caspase-3 (Bcl-2 pathway biomarker) and decrease in Ki-67 proliferation biomarker.

Conclusions:

  • The developed polymeric micelle system enhances cytosolic delivery of protein drugs, overcoming intracellular barriers for cancer therapy.
  • This approach expands the therapeutic potential of ADCs to intracellular targets, including those currently considered undruggable.
  • Enables tailored drug strategies for stratified patient populations and personalized medicine in oncology.

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