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Author Spotlight: Advancements in Hypoxia-Sensitive CAR-T Therapy for Enhanced Cancer Immunotherapy

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SPION-functionalized CAR-T cells: Overcoming key barriers in solid tumor therapy.

Lucas R Carnell¹, Christoph Alexiou¹, Christina Janko¹

¹Department of Otorhinolaryngology, Head and Neck Surgery, Section of Experimental Oncology and Nanomedicine (SEON), Else Kröner-Fresenius-Stiftung Professorship, Universitätsklinikum Erlangen, Erlangen, Germany.

Biochemical and Biophysical Research Communications

|October 17, 2025

Summary

Superparamagnetic iron oxide nanoparticles (SPIONs) enhance chimeric antigen receptor (CAR)-T cell therapy for solid tumors. SPIONs improve tumor targeting, reduce toxicity, and enable real-time tracking via MRI, overcoming key treatment limitations.

Keywords:

Adoptive cell therapy Chimeric antigen receptor (CAR)Magnetic cell targeting Nanomedicine Superparamagnetic iron oxide nanoparticles

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A Spheroid Killing Assay by CAR T Cells

A Spheroid Killing Assay by CAR T Cells

Published on: December 12, 2018

Area of Science:

Biotechnology
Immunotherapy
Nanomedicine

Background:

CAR-T cell therapy shows success in blood cancers but struggles with solid tumors due to antigen heterogeneity, poor infiltration, and immunosuppression.
Systemic CAR-T cell administration can cause severe toxicities like cytokine release syndrome (CRS) and neurotoxicity.

Purpose of the Study:

To review recent advances in SPION-functionalized CAR-T cells for solid tumor treatment.
To highlight SPIONs' potential in overcoming CAR-T cell therapy limitations in solid tumors.

Main Methods:

Functionalization of CAR-T cells with superparamagnetic iron oxide nanoparticles (SPIONs).
Utilizing magnetic fields for targeted accumulation of SPION-CAR-T cells at tumor sites.
Employing magnetic resonance imaging (MRI) for non-invasive tracking of SPION-CAR-T cells.

Main Results:

SPIONs facilitate magnetic field-guided accumulation of CAR-T cells, potentially improving tumor infiltration.
SPIONs may reduce systemic exposure and associated toxicities (CRS, neurotoxicity).
SPIONs enable real-time, non-invasive monitoring of CAR-T cell distribution and localization via MRI.

Conclusions:

SPION-functionalized CAR-T cells represent a promising strategy to enhance efficacy in solid tumors.
This approach addresses key challenges including targeting, infiltration, toxicity, and imaging.
SPIONs offer a multifunctional platform for advancing CAR-T cell therapy in oncology.