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Biosci. (Landmark Ed)"],"abstract":"<jats:p>Background: Ultrasound-responsive nanodroplets (NDs) targeting tumors have shown great potential in ultrasound imaging and tumor therapy, but most of these studies are based NDs with lipid shells that cannot overcome the uptake by cells of the reticulo-endothelial system (RES). NDs with shells comprised of polyethylene glycol (PEG)-based polymers could effectively suppressed the uptake of RES, but the phase transition, contrast-enhanced imaging and drug release about these NDs have not been well illuminated. Methods: Folate receptor targeted NDs with shells of polymers and loaded with DOX (FA-NDs\/DOX) were prepared. The particle size distribution and morphology of NDs was characterized with dynamic light scattering (DLS) and microscope. Phase transition and contrast-enhanced ultrasound imaging under different mechanical indices (MIs) was studied, and the intensity of contrast enhancement were quantitatively analyzed. The targeting property of FA-NDs\/DOX to MDA-MB-231 cells and cellular uptake were observed using a fluorescence microscope. The anti-tumor effects of FA-NDs\/DOX combined with low-intensity focused ultrasound (LIFU) was studied through cytotoxicity tests. Flow cytometry assays were used to detect cell apoptosis. Results: The average particle size of the FA-NDs\/DOX was 448.0 \u00b1 8.9 nm, and the zeta potential was 30.4 \u00b1 0.3 mV. When exposed to ultrasound at 37 \u00b0C, ultrasound contrast enhancement of FA-NDs\/DOX was observed when MI \u22650.19. A stronger acoustic signal was observed under higher MIs and concentrations. The results of quantitative analysis showed that the contrast enhancement intensity of FA-NDs\/DOX (1.5 mg\/mL) at MI of 0.19, 0.29 and 0.48 was 26.6 \u00b1 0.9 dB, 97.0 \u00b1 3.8 dB and 153.1 \u00b1 5.7 dB, respectively. The contrast enhancement of the FA-NDs\/DOX lasted for more than 30 minutes at an MI of 0.48. In targeting experiments, FA-NDs could be recognized by MDA-MB-231 cells, and significant cellular uptake was observed. The blank FA-NDs showed good biocompatibility, while the FA-NDs\/DOX induced apoptosis of MDA-MB-231 and MCF-7 cells. By combining LIFU irradiation and FA-NDs\/DOX treatment, the best cell-killing effect was achieved. Conclusions: The FA-NDs\/DOX prepared in this study has excellent performance in contrast-enhanced ultrasound imaging, tumor targeting and enhanced chemotherapy. This FA-NDs\/DOX with polymer shells provides a novel platform for ultrasound molecular imaging and tumor therapy.<\/jats:p>","DOI":"10.31083\/j.fbl2806115","type":"journal-article","created":{"date-parts":[[2023,6,16]],"date-time":"2023-06-16T05:49:09Z","timestamp":1686894549000},"source":"Crossref","is-referenced-by-count":5,"title":["Study on Contrast-Enhanced Ultrasound Imaging and Anti-Tumor Effects of Drug-Loaded Nanodroplets with Tumor Targeting and Ultrasound Sensitivity"],"prefix":"10.31083","volume":"28","author":[{"given":"Yaqiong","family":"Li","sequence":"first","affiliation":[{"name":"Department of Pharmacy, Henan Provincial People\u2019s Hospital, People\u2019s Hospital of Zhengzhou University, People\u2019s Hospital of Henan University, 450003 Zhengzhou, Henan, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yongqing","family":"Chen","sequence":"first","affiliation":[{"name":"Department of Ultrasound, Henan Provincial People\u2019s Hospital, People's Hospital of Zhengzhou University, People's Hospital of Henan University, 450003 Zhengzhou, Henan, China"},{"name":"Henan Engineering Technology Research Centre of Ultrasonic Molecular Imaging and Nanotechnology, 450003 Zhengzhou, Henan, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ruiqing","family":"Liu","sequence":"first","affiliation":[{"name":"Henan Engineering Technology Research Centre of Ultrasonic Molecular Imaging and Nanotechnology, 450003 Zhengzhou, Henan, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shaobo","family":"Duan","sequence":"first","affiliation":[{"name":"Henan Engineering Technology Research Centre of Ultrasonic Molecular Imaging and Nanotechnology, 450003 Zhengzhou, Henan, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lijuan","family":"Chen","sequence":"first","affiliation":[{"name":"Department of Medical Imaging, Henan Provincial People\u2019s Hospital & the People\u2019s Hospital of Zhengzhou University, 450003 Zhengzhou, Henan, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jun","family":"Sun","sequence":"first","affiliation":[{"name":"Department of Pharmacy, Henan Provincial People\u2019s Hospital, People\u2019s Hospital of Zhengzhou University, People\u2019s Hospital of Henan University, 450003 Zhengzhou, Henan, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lianzhong","family":"Zhang","sequence":"first","affiliation":[{"name":"Department of Ultrasound, Henan Provincial People\u2019s Hospital, People's Hospital of Zhengzhou University, People's Hospital of Henan University, 450003 Zhengzhou, Henan, China"},{"name":"Henan Engineering Technology Research Centre of Ultrasonic Molecular Imaging and Nanotechnology, 450003 Zhengzhou, Henan, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"16242","published-online":{"date-parts":[[2023,6,14]]},"reference":[{"key":"ref1","doi-asserted-by":"crossref","unstructured":"Kiessling F, Huppert J, Palmowski M. 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