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Related Experiment Video

Updated: Jan 21, 2026

Generation of Natural Killer Cells from Human Expanded Potential Stem Cells
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Cellular therapy: Adoptive immunotherapy with expanded natural killer cells.

Dean A Lee1,2

  • 1Department of Hematology, Oncology, and Bone Marrow Transplantation, Nationwide Children's Hospital, Columbus, Ohio.

Immunological Reviews
|July 30, 2019
PubMed
Summary

A novel ex vivo expansion system using feeder cells expressing membrane-bound IL-21 enables sustained growth of natural killer (NK) cells. This breakthrough supports clinical trials for various cancers, including leukemia and solid tumors.

Keywords:
IL-21adoptive immunotherapyfeeder cellsnatural killer cells

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Area of Science:

  • Immunology
  • Cell Biology
  • Oncology

Background:

  • Adoptive immunotherapy using natural killer (NK) cells has been explored for decades.
  • Previous methods using cytokine-induced killer cells and peripheral blood mononuclear cells (PBMCs) had limitations in achieving sufficient cell doses.
  • Challenges included limited cell numbers and purity, restricting clinical efficacy.

Purpose of the Study:

  • To develop an improved ex vivo expansion system for generating large quantities of functional NK cells.
  • To overcome the limitations of previous NK cell expansion techniques.
  • To translate this novel system into clinical trials for treating various cancers.

Main Methods:

  • Development of an ex vivo expansion system utilizing feeder cells engineered to express membrane-bound IL-21.
  • Culturing primary NK cells with these feeder cells to achieve log-phase growth without inducing senescence.
  • Characterization of NK cell biology and correlative science.
  • Translation of the expanded NK cells into clinical trials.

Main Results:

  • The developed system enables log-phase growth of primary NK cells for extended periods (many weeks) without senescence.
  • The approach facilitates the generation of clinically relevant numbers of NK cells.
  • The system has been translated for use in clinical trials involving patients with leukemia, brain tumors, and solid tumors.

Conclusions:

  • The novel ex vivo expansion system using membrane-bound IL-21 feeder cells represents a significant advancement in NK cell therapy.
  • This method overcomes previous dose limitations, paving the way for more effective NK cell-based cancer immunotherapies.
  • The successful translation to clinical trials holds promise for treating a range of malignancies.