This invention relates to the field of
nanomedicine technology, and more particularly to
a DNA nanodumbbell for targeted intrabacterial transport, its preparation method, and its applications. The invention provides
a DNA nanodumbbell for targeted intrabacterial transport, comprising a glucose
polymer, L-
arginine, a
photosensitizer,
streptavidin, and Dum; wherein Dum is a single-stranded
DNA modified with amino and biotinylate groups. This structure enables precise spatial arrangement and controllable loading of the
photosensitizer, therapeutic
drug, and
polysaccharide, thereby playing a stepwise role in targeted bacterial delivery, phototherapy, and
tissue repair. It effectively overcomes the limited targeting efficiency of traditional phototherapy within infected tissues, minimizes non-specific damage to healthy tissues during treatment, and precisely regulates the spatiotemporal sequence of
tissue repair.