Towards Tumor Targeting via Invasive Assay Using Magnetospirillum magneticum

Area of Science:

• Biotechnology and Nanotechnology
• Cell Biology and Microbiology
• Biophysics and Biomagnetism

Background:

• Magnetotactic bacteria (MTB), specifically Magnetospirillum magneticum (AMB-1), possess magnetosomes enabling orientation along Earth's magnetic field.
• Engineered bacteria have demonstrated potential for targeted tumor cell infection and destruction.
• Controlled navigation of bacteria offers possibilities for precise biological manipulation.

Purpose of the Study:

• To develop and demonstrate a technique using AMB-1 for selective doping and isolation of tumor cells via magnetotaxis.
• To investigate the interaction mechanism between AMB-1 and Chinese hamster ovary (CHO) cells using molecular dynamics simulations.
• To experimentally validate the magnetic guidance and interaction of AMB-1 with CHO cells.

Main Methods:

• Fabrication of a micro-coil system to generate magnetic fields for bacterial path control.
• Molecular dynamics (MD) simulations to analyze protein interactions at the AMB-1 and CHO cell interface.
• Experimental co-incubation of AMB-1 and CHO cells, followed by viability assessment and characterization using SEM and EDAX.

Main Results:

• MD simulations revealed compromised CHO cell protein structures, facilitating AMB-1 interaction and survival.
• Experimental assays demonstrated successful magnetic guidance of AMB-1 integrated with CHO cells.
• SEM and EDAX confirmed AMB-1/CHO cell morphology, interaction, and magnetosome presence in interacted CHO cells.

Conclusions:

• AMB-1 can be magnetically guided to interact with and potentially isolate specific cell types like CHO cells.
• The study establishes a foundation for magnetic invasive assays for targeted cell manipulation.
• AMB-1 integration with host cells is feasible, with implications for future biomedical applications.