Triple negative breast cancer (TNBC) is the most aggressive
subtype
of breast cancer, with ineffective treatment and poor prognosis. It
is in great demand to develop a novel theranostic strategy for accurate
diagnosis and targeted treatment of TNBC. In the present study, one
nanoplatform (HA-ICG-Fe-PDA), endowed with multimodal imaging-guided
chemodynamic/photodynamic/photothermal (CDT/PDT/PTT) synergistic therapy
capacity toward TNBC, was innovatively constructed. The nanoplatform
was prepared by covalently conjugating ICG-decorated hyaluronic acid
(HA) on Fe3+-chelated polydopamine (PDA). HA facilitated
the targeting and accumulating of the nanoplatform in tumor tissue
and cells of TNBC, thus producing enhanced magnetic resonance signal.
Upon entering into TNBC cells, the intracellular hyaluronidase-catalyzed
cleavage of HA-ICG-Fe-PDA activated the prequenched near-infrared
(NIR) fluorescence signal, allowing for the activatable NIR fluorescence
imaging. On the other hand, Fe3+ in the nanoplatform could
be reduced to reactive Fe2+ in tumor microenvironment,
guaranteeing efficient Fenton reaction-mediated CDT. The combination
of ICG with Fe-PDA enhanced the NIR absorption of the nanoplatform
so that considerable PTT/PDT and photothermal imaging were achieved
under 808 nm laser irradiation. In vitro and in vivo experiments have verified that the proposed nanoplatform
integrates the potential of TNBC-targeting, precise NIR fluorescence/magnetic
resonance/photothermal trimodal imaging, efficient treatment via synergistic
CDT/PDT/PTT, as well as excellent biocompatibility. Therefore, this
multifunctional nanoplatform provides a simple and versatile strategy
for imaging-guided theranostics of TNBC.