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Other Unique Bacteria

Other Unique Bacteria

Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic and are commonly found near the...

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Magnetic-, Acoustic-, and Optical-Triple-Responsive Microbubbles for Magnetic Hyperthermia and Pothotothermal Combination Cancer Therapy

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Modular Biosurface Engineering of Magnetotactic Bacteria for Multimodal Synergistic Cancer Therapy.

Qilong Li^1,2, Wangqing Li³, Xuefei Sun^1,2

¹Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.

Chem & Bio Engineering

|June 3, 2026

Summary

Engineered magnetotactic bacteria (AMB-1) overcome cancer therapy challenges. Functionalized bacteria deliver targeted treatments, reprogram the tumor microenvironment, and activate immunity, significantly improving survival in preclinical models.

Keywords:

Antitumor Immunity Biosurface Engineering Cancer Therapy Magnetotactic Bacteria Tumor Targeting

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Area of Science:

Synthetic Biology
Materials Science
Cancer Therapy

Background:

Bacterial-mediated cancer therapy offers promise but faces bioavailability and biosafety hurdles.
Existing strategies struggle with effective tumor penetration and overcoming the immunosuppressive tumor microenvironment (TME).

Purpose of the Study:

To develop a versatile biosurface-engineering platform for functionalizing magnetotactic bacteria (Magnetospirillum magneticum, AMB-1).
To demonstrate a proof-of-concept for bacteria-mediated therapy combining targeted delivery, TME reprogramming, and immunotherapy.

Main Methods:

Functionalization of AMB-1 with Fe3+-polydopamine (PDA) nanoparticles.
Evaluation of AMB-1@Fe3+-PDA in murine models of aggressive 4T1 breast cancer.
Assessment of tumor penetration, TME modulation, immune activation, and therapeutic efficacy.

Main Results:

AMB-1@Fe3+-PDA enhanced deep-tissue penetration and reprogrammed the immunosuppressive TME.
Combined photothermal-chemodynamic therapy with immune activation synergistically suppressed tumor progression, metastasis, and recurrence.
Treatment prolonged median survival from 45 to 67 days and induced systemic antitumor immunity with abscopal effects.

Conclusions:

The scalable biosurface-engineering platform enables diverse material integration onto AMB-1 for advanced cancer therapy.
Engineered AMB-1@Fe3+-PDA demonstrates a potent bacteria-mediated strategy for aggressive breast cancer treatment.
This approach establishes a generalizable blueprint for advancing clinical translation of engineered bacterial therapies.