Nanoparticles camouflaged
by red blood cell (RBC) membranes have
attracted considerable attention owing to reservation of structure
of membrane and surface proteins, endowing prominent cell-specific
function including biocompatibility, prolonged circulation lifetime,
and reduced reticular endothelial system (RES) uptake ability. Considering
the drawbacks of carrier-free nanomedicine including the serious drug
burst release, poor stability, and lack of immune escape function,
herein we developed and fabricated a novel RBC membranes biomimetic combinational therapeutic system by
enveloping the small molecular drug coassemblies of 10-hydroxycamptothecin
(10-HCPT) and indocyanine green (ICG) in the RBC membranes for prolonged
circulation, controlled drug release, and synergistic chemo-photothermal
therapy (PTT). The self-reorganized RBCs@ICG-HCPT nanoparticles (NPs)
exhibited a diameter of ∼150 nm with core–shell structure,
high drug payload (∼92 wt %), and reduced RES uptake function.
Taking advantage of the stealth functionality of RBC membranes, RBCs@ICG-HCPT
NPs remarkably enhanced the accumulation at the tumor sites by passive
targeting followed by cellular endocytosis. Upon the stimuli of near-infrared
laser followed by acidic stimulation, RBCs@ICG-HCPT NPs showed exceptional
instability by heat-mediated membrane disruption and pH change, thereby
triggering the rapid disassembly and accelerated drug release. Consequently,
compared with individual treatment, RBCs@ICG-HCPT NPs under dual-stimuli
accomplished highly efficient apoptosis in cancer cells and remarkable
ablation of tumors by chemo-PTT. This biomimetic nanoplatform based
on carrier-free, small molecular drug coassemblies integrating imaging
capacity as a promising theranostic system provides potential for
cancer diagnosis and combinational therapy.
Positive resection margin frequently exists in breast‐conserving treatment (BCT) of early‐stage breast cancer, and insufficient therapeutic efficacy is common during radiotherapy (RT) in advanced breast cancer patients. Moreover, a multimodal nanotherapy platform is urgently required for precision cancer medicine. Therefore, a biodegradable cyclic RGD pentapeptide/hollow virus‐like gadolinium (Gd)‐based indocyanine green (R&HV‐Gd@ICG) nanoprobe is developed to improve fluorescence image‐guided surgery and breast cancer RT efficacy. R&HV‐Gd exhibits remarkably improved aqueous stability, tumor retention, and target specificity of ICG, and achieves outstanding magnetic resonance/second near‐infrared (NIR‐II) window multimodal imaging in vivo. The nanoprobe‐based NIR‐II fluorescence image guidance facilitates complete tumor resection, improves the overall mouse survival rate, and effectively discriminates between benign and malignant breast tissues in spontaneous breast cancer transgenic mice (area under the curve = 0.978; 95% confidence interval: 0.952, 1.0). Moreover, introducing the nanoprobe to tumors generated more reactive oxygen species under X‐ray irradiation, improved RT sensitivity, and reduced mouse tumor progression. Notably, the nanoprobe is biodegradable in vivo and exhibits accelerated bodily clearance, which is expected to reduce the potential long‐term inorganic nanoparticle toxicity. Overall, the nanoprobe provides a basis for developing precision breast cancer treatment strategies.
Locating
nanomedicines at the active sites plays a pivotal role
in the nanoparticle-based cancer therapy field. Herein, a multifunctional
nanotherapeutic is designed by using graphene oxide (GO) nanosheets
with rich carboxyl groups as the supporter for hyaluronic acid (HA)–methotrexate
(MTX) prodrug modification via an adipicdihydrazide cross-linker,
achieving synergistic multistage tumor-targeting and combined chemo-photothermal
therapy. As a tumor-targeting biomaterial, HA can increase affinity
of the nanocarrier toward CD44 receptor for enhanced cellular uptake.
MTX, a chemotherapeutic agent, can also serve as a tumor-targeting
enhancer toward folate receptor based on its similar structure with
folic acid. The prepared nanosystems possess a sheet shape with a
dynamic size of approximately 200 nm and pH-responsive drug release.
Unexpectedly, the physiological stability of HA–MTX prodrug-decorated
GO nanosystems in PBS, serum, and even plasma is more excellent than
that of HA-decorated GO nanosystems, while both of them exhibit an
enhanced photothermal effect than GO nanosheets. More importantly,
because of good blood compatibility as well as reduced undesired interactions
with blood components, HA–MTX prodrug-decorated GO nanosystems
exhibited remarkably superior accumulation at the tumor sites by passive
and active targeting mechanisms, achieving highly effective synergistic
chemo-photothermal therapeutic effect upon near-infrared laser irradiation,
efficient ablation of tumors, and negligible systemic toxicity. Hence,
the HA–MTX prodrug-decorated hybrid nanosystems have a promising
potential for synergistic multistage tumor-targeting therapy.
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