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Updated: Jul 1, 2025
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Quantifying Antibody-Dependent Cellular Cytotoxicity in a Tumor Spheroid Model: Application for Drug Discovery
Published on: April 26, 2024
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T-cell help in the tumor microenvironment enhances rituximab-mediated NK-cell ADCC
Jyoti Arora1,2, Sabarish Ayyappan1,3, Chaobo Yin1
1Holden Comprehensive Cancer Center, University of Iowa, Iowa City, IA.
Blood
|March 8, 2024
Summary
T cells enhance rituximab therapy by supporting natural killer (NK) cell function. This T-cell help boosts rituximab-mediated antibody-dependent cellular cytotoxicity (ADCC) in the tumor microenvironment (TME), improving treatment effectiveness.
Area of Science:
- Immunology
- Oncology
- Cell Biology
Background:
- Rituximab (RTX) is a monoclonal antibody (mAb) crucial in cancer therapy, primarily acting via antibody-dependent cellular cytotoxicity (ADCC) mediated by natural killer (NK) cells.
- NK cell efficacy is vital for RTX effectiveness, but not all patients respond optimally.
- Previous in vitro studies suggested T cells support NK cell activity.
Purpose of the Study:
- To investigate the role of T-cell help in enhancing RTX-mediated NK-cell ADCC within the tumor microenvironment (TME) in vivo.
- To evaluate the impact of T cells on NK cell viability and function during RTX therapy.
Main Methods:
- Development of a humanized mouse model with controlled T-cell numbers in a lymphoma TME.
- Administration of RTX in the mouse model with and without T cells, and with NK cell depletion.
- Correlative analysis of clinical samples (fine needle aspirates) from indolent lymphoma patients before and after RTX treatment.
Main Results:
- In the mouse model, RTX treatment led to decreased NK cell viability and expression of CD16/CD25 without T cells, but increased these parameters with T cells present.
- RTX therapy efficacy was significantly higher in the presence of T cells and ineffective upon NK cell depletion.
- Clinical data showed a correlation between pre-therapy CD4+ and total T cells in the TME and increased NK cell CD16/CD25 expression post-RTX.
Conclusions:
- T-cell help within the TME is critical for enhancing RTX-mediated NK cell viability and ADCC.
- The presence of T cells significantly improves the effectiveness of RTX therapy.
- Targeting T-cell interactions within the TME could be a strategy to improve RTX efficacy in lymphoma patients.
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