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Related Experiment Video

Updated: Aug 2, 2025

Cell Labeling and Targeting with Superparamagnetic Iron Oxide Nanoparticles

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Published on: October 19, 2015

Magnetic Microsphere Scaffold-Based Soft Microbots for Targeted Mesenchymal Stem Cell Delivery.

Yuan Tian¹, Wei Han^2,3, King Lun Yeung^1,2,3

¹Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.

Small (Weinheim an Der Bergstrasse, Germany)

|April 14, 2023

Summary

This study introduces a magnetic microbot for targeted delivery of stem cells. The microbot navigates precisely and releases mesenchymal stem cells (MSCs) to promote tissue healing.

Keywords:

cell delivery hydrogel biomaterials magnetic soft microbots microsphere scaffold stem cell therapy

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Published on: June 18, 2018

Area of Science:

Biomedical Engineering
Regenerative Medicine
Nanotechnology

Background:

Developing targeted drug and cell delivery systems is crucial for effective regenerative medicine.
Current methods for delivering therapeutic cells to specific sites face challenges in precision and efficiency.

Purpose of the Study:

To develop a magnetically actuated microbot for precise delivery of mesenchymal stem cells (MSCs).
To evaluate the microbot's navigation capabilities, cargo unloading efficiency, and therapeutic potential in promoting tissue healing.

Main Methods:

Assembling a soft microbot from magnetic microsphere scaffold (MMS) beads carrying MSCs.
Utilizing oscillating magnetic fields for microbot actuation and navigation.
Assessing stem cell viability and healing promotion via scratch-wound assays after cargo unloading.

Main Results:

A seven-bead microbot achieved a speed of 205.6 µm/s with controlled flexion angles (10-24.5°) for navigating narrow spaces.
Mesenchymal stem cells were successfully unloaded using a phosphate-buffered saline solution, maintaining high viability and vitality.
Released stem cells significantly enhanced wound healing (83.2% vs 49%) in a scratch-wound assay.

Conclusions:

The magnetic microbot offers precise, targeted delivery of therapeutic stem cells to promote healing.
Its versatility allows for the customizable delivery of various cargoes, including cells, biomolecules, and pharmaceuticals.
This technology holds promise for integration with minimally invasive surgery for enhanced therapeutic outcomes.