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Lymph node microenvironment remodeling unlocks local antibody-mediated B cell depletion.
Zacarias Garcia1, Margot Bardou1, Anne Loap1
1Dynamics of Immune Responses Unit, Institut Pasteur, Université Paris Cité, INSERM U1223, Paris, France.
Science Advances
|June 10, 2026
Summary
Lymph nodes shield malignant B cells from anti-CD20 antibody therapy. Remodeling the lymph node microenvironment enhances B cell depletion, improving treatment efficacy for B cell malignancies.
Area of Science:
- Immunology
- Oncology
- Cell Biology
Background:
- Lymph nodes (LNs) serve as reservoirs for CD20+ B cell malignancies and autoimmune diseases.
- Anti-CD20 monoclonal antibodies (mAbs) have improved outcomes but face limitations like relapse and progression.
Purpose of the Study:
- To investigate the role of the lymph node microenvironment in modulating anti-CD20 mAb efficacy.
- To identify strategies for overcoming therapeutic limitations within lymphoid organs.
Main Methods:
- Analysis of B cell behavior and localization within lymph nodes.
- Assessment of anti-CD20 mAb efficacy in the presence and absence of lymph node microenvironment remodeling (e.g., irradiation).
Main Results:
- Malignant B cells exhibit sessile, tissue-retained behavior within LNs, limiting systemic depletion.
- LN architecture acts as a structural barrier, segregating B cells from effector cells.
- Remodeling the LN microenvironment via irradiation enhanced anti-CD20 mAb-mediated B cell depletion.
Conclusions:
- The lymph node microenvironment significantly impacts anti-CD20 mAb efficacy.
- LN architecture presents a barrier to antibody-based therapies.
- Tissue remodeling is a potential strategy to improve therapeutic responses in lymphoid organs.
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