Scientific Frontline: Extended "At a Glance" Summary: Modular Nanorobotics
The Core Concept: A highly versatile, nanoscale robotic system constructed from biomolecules and nanoparticles that utilizes interchangeable modules to perform specific tasks, such as delivering targeted therapeutics or executing enzymatic reactions.
Key Distinction/Mechanism: Unlike traditional nanorobots designed for a single, specific task, this system utilizes a highly adaptable two-part modular design—a magnetic propulsion module and a payload capsule. These modules are linked by a programmable, DNA-based molecular "Velcro" system that facilitates dynamic self-assembly, disassembly, and component reuse.
Major Frameworks/Components:
- Magnetic Propulsion Module: Enables controlled movement of the nanorobot and allows for magnetic retrieval and reuse upon task completion.
- Payload Capsule: Houses four nanoscale polymer vesicles designed to safely transport and selectively release encapsulated enzymes or therapeutic agents.
- DNA-Based Molecular Velcro: Employs complementary DNA strands to ensure the propulsion and payload modules couple securely in a programmable manner.
- Docking Biomolecules: Specific surface molecules attached to the payload capsule that facilitate targeted binding to distinct cellular surfaces, such as HeLa cancer cells.
Branch of Science: Nanotechnology, Bioengineering, Molecular Biology, and Nanomedicine.
Future Application: The deployment of highly targeted medical therapies (such as the localized synthesis and delivery of anticancer drugs), advanced industrial catalysis, and environmental remediation technologies where nanomachines require retrieval and reconfiguration.
Why It Matters: The targeted capabilities of this nanorobot allow for the localized concentration of drugs, significantly enhancing therapeutic efficacy while reducing systemic side effects. Furthermore, the modular, reusable architecture overcomes the limitations of single-use nanomachines, establishing a scalable platform for multiple scientific and industrial domains.
A team at the University of Basel has developed a versatile nanorobot with propulsion and payload modules. The two reusable modules autonomously self-assemble and could be used in medicine or industry.
Nanorobots sound like science fiction: tiny machines for medicine, the environment, or industry. In fact, nanorobotics has become a rapidly growing field of research. It is considered a promising approach, for example, for delivering active substances to specific locations in the body. Unlike their larger-scale counterparts, they are not made of electronics, computer chips, and software, but rather of biomolecules and nanoparticles.
Researchers led by Professor Cornelia Palivan from the University of Basel are now reporting on a sophisticated modular nanorobot with greater functional flexibility than many existing systems. “Previous nanorobots are often designed for a specific task only,” says Palivan. “Our modular system, on the other hand, can be adapted to different applications.” The technology could be used not only in medicine but also in industry and environmental technology.
Propulsion Module and Payload Capsule
The nanorobot, which the team describes in the journal Advanced Functional Materials, resembles a lunar rocket with multiple modules. A magnetic propulsion module moves the nanorobot, while a second module serves as a payload capsule, safely transporting therapeutic agents or enzymes to their target location.
In previous work, Palivan’s team developed nanoscale polymer vesicles that protect encapsulated enzymes. Molecules can enter the vesicle through pores and be processed by the enzymes, after which their products are released into the environment. The payload capsule of the nanorobot contains four such enzyme-loaded polymer vesicles, providing the desired functionality. Depending on the design, the vesicles inside the payload capsule can also be selectively opened, for example, to release bioactive compounds.
A DNA-Based Molecular Velcro System
The two modules are connected by a DNA-based “Velcro fastener”: complementary DNA strands on both modules ensure that the propulsion module and the payload capsule self-assemble in a programmable manner and remain stably coupled.
To enable the nanorobot to dock onto specific cells or materials, the payload capsule is also equipped with additional biomolecules that facilitate docking. In the lab, the team tested this using a human cancer cell line known as HeLa cells. They loaded the nanorobots with fluorescent molecules and observed under a microscope that they accumulated on the surface of the cells.
Targeted Attack on Cancer Cells and Other Applications
Equipped with the necessary enzymes, the nanorobots successfully produced an anticancer drug that reduced the viability of the HeLa cells to 16% within 72 hours. “The drug can have a concentrated local effect if we use our nanorobot to specifically target it to the cancer cells,” explains Dr. Voichita Mihali, the first author of the study.
For other applications outside the medical domain—for example, catalysis—another feature might prove particularly valuable: since the propulsion module is magnetic, the nanorobots can be retrieved and reused after their task is completed. The researchers were also able to separate the two modules, refill the payload capsules, and recombine them with the propulsion modules.
The modular nanorobot represents an important step toward a multifunctional tool for a wide range of applications. Although its use in humans remains a long-term goal, the system can be readily adapted for other domains simply by modifying the payload capsule.
Additional information: The work was conducted within the framework of the National Center of Competence in Research—Molecular Systems Engineering and the Swiss Nanoscience Institute. The University of Basel team collaborated with researchers from Heidelberg University.
Published in journal: Advanced Functional Materials
Title: Multiplex Modular Nanorobotic Systems with Catalytic Activity under Magnetic Navigation
Authors: Voichita Mihali, Xinan Huang, Lucie Motyckova, Nicolas Moreno Gomez, Michal Skowicki, Cora-Ann Schoenenberger, Peer Fischer, and Cornelia G. Palivan
Source/Credit: University of Basel | Angelika Jacobs
Edited by: Scientific Frontline
Reference Number: nt061726_01