Abstract:Purpose
Chemoradiation therapy is the standard of care in muscle-invasive bladder cancer (MIBC). Although agents such as gemcitabine can enhance tumor radiosensitivity, their side effects can limit patient eligibility and treatment efficacy. This study investigates ultrasound and microbubbles for targeting gemcitabine delivery to reduce normal-tissue toxicity in a murine orthotopic MIBC model.
Materials and Methods
CD1-nude mice were injected orthotopically with RT112 b… Show more
“…This significantly improves treatment efficiency and reduces systemic toxicity and drug side effects, rendering it the tumor-targeted therapy strategy with the most promising potential at present. [33][34][35] In this study, ultrasound NBs were used as drug delivery carriers. Based on the bridging effect between biotin-streptavidin, PD-L1 mAb/DOX-NBs were successfully prepared with a small and uniform particle size, high antibody connection rate, and good safety in vivo.…”
Purpose
Ultrasound nanobubbles (NBs) can kill tumor cells, mediated by their effects of cavitation and acoustic perforation through ultrasound, while as novel drug carriers, biomaterial-modified NBs release drugs at a target region. In this work, the ultrasound NBs bridged by biotin-streptavidin were prepared simultaneously to be loaded with both programmed death ligand 1 monoclonal antibody (PD-L1 mAb) and doxorubicin (DOX), which are immune checkpoint inhibitors (ICIs) and chemotherapeutic agents, to synergize immunotherapy and chemotherapy combined with sonodynamic therapy (SDT).
Methods
The PD-L1 mAb/DOX NBs, using bridging affinity biotin (BRAB) technology as a bridge, were prepared by thin-film hydration and mechanical oscillation for the targeted delivery of biotinylated PD-L1 mAb and DOX. Characterization and pharmacokinetic studies of PD-L1 mAb/DOX NBs were performed in vitro and in vivo. The antitumor effect of ultrasound-mediated PD-L1 mAb/DOX-NBs was studied in the subcutaneously transplanted tumor of the H22 hepatoma model, and the mechanism of synergistic tumor repression was investigated.
Results
The data of in vitro targeting experiments, contrast-enhanced ultrasound imaging (CEUS), in vivo imaging of the small animals imaging system (IVIS), and frozen sections showed that PD-L1 mAb/DOX-NBs have well-targeted aggregation in the tumor. By observing tumor inhibition rate, tissue cell apoptosis, and apoptosis-related gene and protein expression, the PD-L1 mAb/DOX-NBs group showed the best immunotherapy effects, and its tumor volume and mass inhibition rates were about 69.64% and 75.97%, respectively (
P
< 0.01). Therefore, blocking the PD-1/PD-L1 pathway could improve immune cells’ tumor-killing ability. Antitumor immune cytokines were further enhanced when combined with DOX-induced tumor cell apoptosis and immunogenic cell death (ICD).
Conclusion
In summary, ultrasound-mediated PD-L1 mAb/DOX-NBs showed significant synergistic antitumor effects, providing a potential combined immunotherapy strategy for HCC.
“…This significantly improves treatment efficiency and reduces systemic toxicity and drug side effects, rendering it the tumor-targeted therapy strategy with the most promising potential at present. [33][34][35] In this study, ultrasound NBs were used as drug delivery carriers. Based on the bridging effect between biotin-streptavidin, PD-L1 mAb/DOX-NBs were successfully prepared with a small and uniform particle size, high antibody connection rate, and good safety in vivo.…”
Purpose
Ultrasound nanobubbles (NBs) can kill tumor cells, mediated by their effects of cavitation and acoustic perforation through ultrasound, while as novel drug carriers, biomaterial-modified NBs release drugs at a target region. In this work, the ultrasound NBs bridged by biotin-streptavidin were prepared simultaneously to be loaded with both programmed death ligand 1 monoclonal antibody (PD-L1 mAb) and doxorubicin (DOX), which are immune checkpoint inhibitors (ICIs) and chemotherapeutic agents, to synergize immunotherapy and chemotherapy combined with sonodynamic therapy (SDT).
Methods
The PD-L1 mAb/DOX NBs, using bridging affinity biotin (BRAB) technology as a bridge, were prepared by thin-film hydration and mechanical oscillation for the targeted delivery of biotinylated PD-L1 mAb and DOX. Characterization and pharmacokinetic studies of PD-L1 mAb/DOX NBs were performed in vitro and in vivo. The antitumor effect of ultrasound-mediated PD-L1 mAb/DOX-NBs was studied in the subcutaneously transplanted tumor of the H22 hepatoma model, and the mechanism of synergistic tumor repression was investigated.
Results
The data of in vitro targeting experiments, contrast-enhanced ultrasound imaging (CEUS), in vivo imaging of the small animals imaging system (IVIS), and frozen sections showed that PD-L1 mAb/DOX-NBs have well-targeted aggregation in the tumor. By observing tumor inhibition rate, tissue cell apoptosis, and apoptosis-related gene and protein expression, the PD-L1 mAb/DOX-NBs group showed the best immunotherapy effects, and its tumor volume and mass inhibition rates were about 69.64% and 75.97%, respectively (
P
< 0.01). Therefore, blocking the PD-1/PD-L1 pathway could improve immune cells’ tumor-killing ability. Antitumor immune cytokines were further enhanced when combined with DOX-induced tumor cell apoptosis and immunogenic cell death (ICD).
Conclusion
In summary, ultrasound-mediated PD-L1 mAb/DOX-NBs showed significant synergistic antitumor effects, providing a potential combined immunotherapy strategy for HCC.
“… MRI-guided focused ultrasound enhanced doxorubicin delivery by 4-fold compared to controls and significantly suppressed the volumetric tumor growth rate (24.4 ± 10.9%). Ruan (2021) [131] Gemcitabine Murine bladder tumor model (RT112 cells) Microbubble: diameter data not given Conc. : 3 × 10 8 /mL Freq.…”
Section: Cavitation-mediated Drug Deliverymentioning
confidence: 99%
“…For chemotherapy alone, cavitation selectively and efficiently enhanced the accumulation (4–8-folds) of drugs (paclitaxel, doxorubicin, gemcitabine, etoposide, and hydroxychloroquine) in tumor regions to improve the therapeutic efficiency [12] , [13] , [129] , [130] , [131] , [132] . Idbaih et al reported a first-in-man clinical trial in patients with recurrent glioblastoma of the cavitation-enhanced trans -BBB delivery of a chemotherapeutic drug (carboplatin).…”
Section: Cavitation-mediated Drug Deliverymentioning
“…US-mediated drug delivery methods hardly exacerbate the acute intestinal toxicity using the crypt assay in contrast to conventional chemoradiation. 93 In another gemcitabine delivery study, in vitro and in vivo RT112 bladder cancer cell line and murine orthotopic muscle-invasive bladder cancer model was tested. No significant increase in drug uptake was observed due to the US when compared to drug control of Drug+MBs.…”
Section: Interaction Of Ultrasound Withmentioning
confidence: 99%
“…Another study used US+MBs for targeted gemcitabine delivery to minimize normal-tissue toxicity in a mouse orthotopic MIBC model. US-mediated drug delivery methods hardly exacerbate the acute intestinal toxicity using the crypt assay in contrast to conventional chemoradiation . In another gemcitabine delivery study, in vitro and in vivo RT112 bladder cancer cell line and murine orthotopic muscle-invasive bladder cancer model was tested.…”
Section: Interaction Of Ultrasound
With Biological Systems:
Physical ...mentioning
The
role of ultrasound in medicine and biological sciences is expanding
rapidly beyond its use in conventional diagnostic imaging. Numerous
studies have reported the effects of ultrasound on cellular and tissue
physiology. Advances in instrumentation and electronics have enabled
successful in vivo applications of therapeutic ultrasound.
Despite path breaking advances in understanding the biophysical and
biological mechanisms at both microscopic and macroscopic scales,
there remain substantial gaps. With the progression of research in
this area, it is important to take stock of the current understanding
of the field and to highlight important areas for future work. We
present herein key developments in the biological applications of
ultrasound especially in the context of nanoparticle delivery, drug
delivery, and regenerative medicine. We conclude with a brief perspective
on the current promise, limitations, and future directions for interfacing
ultrasound technology with biological systems, which could provide
guidance for future investigations in this interdisciplinary area.
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