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Surface Engineering of NK Cells with Poly-L-Glutamic Acid Enhances Tumor-Selective Immunotherapy Against Ovarian

Yoonbum Park1, Ashok Kumar Jangid1, Kyung Mu Noh1

  • 1Department of Chemical & Biochemical Engineering, Dongguk University, Seoul 04620, Republic of Korea.

Cells
|May 13, 2026
PubMed

Insights

This study engineered natural killer (NK) cells to better target solid tumors. The novel lipid-mediated cell membrane strategy enhances NK cell immunotherapy for ovarian cancer, improving tumor cell recognition and killing.

Area of Science:

  • Immunology
  • Biotechnology
  • Oncology

Background:

  • Natural killer (NK) cells are crucial for cancer immunotherapy due to their ability to kill tumor cells without prior sensitization.
  • A major limitation of NK cell therapy is their insufficient recognition of solid tumors, hindering their anticancer efficacy.
  • Developing strategies to enhance NK cell tumor targeting is vital for improving cancer immunotherapy outcomes.

Purpose of the Study:

  • To engineer NK cells for enhanced targeting and cytotoxic efficacy against solid tumors, specifically ovarian cancer.
  • To develop a non-genetic, lipid-mediated cell membrane engineering strategy for NK cell surface modification.
  • To investigate the mechanism of enhanced NK cell-tumor cell interaction using poly-L-glutamic acid (PLE).

Main Methods:

  • Developed a lipid-mediated strategy to display poly-L-glutamic acid (PLE) on NK cell surfaces, creating PLE-NK cells.
  • Utilized PLE's affinity for cholesterol-rich domains to target ovarian cancer cells.
  • Assessed the interaction, cytotoxicity, and off-target effects of PLE-NK cells on ovarian cancer cells and normal fibroblasts.

Main Results:

  • Surface-engineered PLE-NK cells demonstrated enhanced recognition and binding to ovarian cancer cells.
  • PLE-NK cells showed significantly increased cytotoxicity against ovarian cancer cells and disrupted 3D tumoroids.
  • No off-target cytotoxic effects were observed on normal fibroblasts, indicating specificity.

Conclusions:

  • Lipid-mediated NK cell surface engineering with PLE-Lipid is a simple and effective method to improve NK cell tumor targeting.
  • This strategy enhances NK cell-based immunotherapy efficacy, particularly for ovarian cancer.
  • PLE-NK cells represent a promising platform for advancing cancer immunotherapy against solid tumors.
Keywords:
immunotherapymembrane engineeringnatural killer cellsovarian cancerpoly-L-glutamic acidtumor targeting

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