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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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Engineered Magnetobacterial Microrobots with Tunable Self-Mineralization for Precise Imaging-Guided Photothermal

Hui Ran¹, Lishan Zhang¹, Yicheng Ye²

¹NMPA Key Laboratory for Research and Evaluation of Drug Metabolism & Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou 510515, China.

|March 23, 2026

Summary

Engineered biohybrid micromotors (BAMs) combine bacteria and quantum dots for precise tumor targeting and therapy. These smart nanomachines offer advanced imaging and photothermal treatment, overcoming biological barriers for effective cancer intervention.

Keywords:

magnetotactic bacteria near-infrared-II imaging photothermal therapy self-mineralization silver sulfide quantum dots

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Area of Science:

Biomedical Engineering
Nanotechnology
Cancer Therapy

Background:

Micro/nanomotors show potential for remote manipulation in biological settings.
Integrating barrier penetration, real-time tracking, and theranostics in motors is challenging.

Purpose of the Study:

To engineer magneto-actuated and optically imageable biohybrid micromotors (BAMs) for precise tumor therapy.
To develop a platform overcoming passive diffusion and enabling precise theranostics.

Main Methods:

Biohybrid micromotors (BAMs) were created using magnetospirillum bacteria (AMB-1) and Ag2S quantum dots.
BAMs utilized hypoxia-driven chemotaxis and magnetic navigation for tumor targeting.
Near-infrared (NIR)-II fluorescence imaging and photothermal conversion were employed for monitoring and therapy.

Main Results:

BAMs successfully migrated to hypoxic tumor cores via synergistic chemotaxis and magnetic actuation.
NIR-II fluorescence imaging allowed real-time monitoring of BAMs' tumor localization.
Photothermal conversion by BAMs induced tumor cell apoptosis and suppressed tumor growth.

Conclusions:

The engineered BAMs platform offers precise theranostics through integrated magnetic guidance, NIR-II imaging, and photothermal therapy.
This biohybrid system overcomes passive diffusion limitations for enhanced tumor treatment.
BAMs demonstrate significant promise for advanced, targeted cancer interventions.