title: Biofunctionalized magnetic-vortex microdiscs for targeted cancer-cell destruction.
abstract: Nanomagnetic materials offer exciting avenues for probing cell mechanics and activating mechanosensitive ion channels, as well as for advancing cancer therapies. Most experimental works so far have used superparamagnetic materials. This report describes a first approach based on interfacing cells with lithographically defined microdiscs that possess a spin-vortex ground state. When an alternating magnetic field is applied the microdisc vortices shift, creating an oscillation, which transmits a mechanical force to the cell. Because reduced sensitivity of cancer cells toward apoptosis leads to inappropriate cell survival and malignant progression, selective induction of apoptosis is of great importance for the anticancer therapeutic strategies. We show that the spin-vortex-mediated stimulus creates two dramatic effects: compromised integrity of the cellular membrane, and initiation of programmed cell death. A low-frequency field of a few tens of hertz applied for only ten minutes was sufficient to achieve approximately 90% cancer-cell destruction in vitro.
authors: Materials Sciences Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors: Dong-Hyun
authors: DH
authors: Kim
authors: Elena A
authors: EA
authors: Rozhkova
authors: Ilya V
authors: IV
authors: Ulasov
authors: Samuel D
authors: SD
authors: Bader
authors: Tijana
authors: T
authors: Rajh
authors: Maciej S
authors: MS
authors: Lesniak
authors: Valentyn
authors: V
authors: Novosad
mesh_terms: D000911:Antibodies, Monoclonal / Q000378:metabolism; D001672:Biocompatible Materials / Q000737:chemistry / Q000378:metabolism; D002118:Calcium / Q000378:metabolism; D016923:Cell Death; D045744:Cell Line, Tumor; D002462:Cell Membrane / Q000378:metabolism; D006801:Humans; D042541:Intracellular Space / Q000378:metabolism; D008280:Magnetics; D055595:Mechanical Phenomena; D057054:Molecular Imaging; D009369:Neoplasms / Q000378:metabolism / Q000473:pathology* / Q000628:therapy*
chemical_list: D000911:Antibodies, Monoclonal; D001672:Biocompatible Materials; D002118:Calcium