Magnetotactic Sperm Cells for Assisted Reproduction

Author:

Striggow Friedrich1,Ribeiro Carla1,Aziz Azaam1,Nauber Richard1,Hebenstreit Franziska1,Schmidt Oliver G.23,Medina‐Sánchez Mariana14ORCID

Affiliation:

1. Micro‐ and NanoBiomedical Engineering Group (MNBE) Institute for Emerging Electronic Technologies Leibniz Institute for Solid State and Materials Research (IFW) 01069 Dresden Germany

2. Research Center for Materials Architectures and Integration of Nanomembranes (MAIN) Chemnitz University of Technology 09126 Chemnitz Germany

3. Faculty of Physics TU Dresden 01062 Dresden Germany

4. Chair of Micro‐ and NanoSystems Center for Molecular Bioengineering (B CUBE) Technische Universität Dresden 01307 Dresden Germany

Abstract

AbstractBiohybrid micromotors are active microscopic agents consisting of biological and synthetic components that are being developed as novel tools for biomedical applications. By capturing motile sperm cells within engineered microstructures, they can be controlled remotely while being propelled forward by the flagellar beat. This makes them an interesting tool for reproductive medicine that can enable minimally invasive sperm cell delivery to the oocyte in vivo, as a treatment for infertility. The generation of sperm‐based micromotors in sufficiently large numbers, as they are required in biomedical applications has been challenging, either due to the employed fabrication techniques or the stability of the microstructure‐sperm coupling. Here, biohybrid micromotors, which can be assembled in a fast and simple process using magnetic microparticles, are presented. These magnetotactic sperm cells show a high motility and swimming speed and can be transferred between different environments without large detrimental effects on sperm motility and membrane integrity. Furthermore, clusters of micromotors are assembled magnetically and visualized using dual ultrasound (US)/photoacoustic (PA) imaging. Finally, a protocol for the scaled‐up assembly of micromotors and their purification for use in in vitro fertilization (IVF) is presented, bringing them closer to their biomedical implementation.

Funder

European Research Council

Publisher

Wiley

Subject

Biomaterials,Biotechnology,General Materials Science,General Chemistry

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