Phthalocyanine-Conjugated Upconversion NaYF4 :Yb3+ /Er3+ @SiO2 Nanospheres for NIR-Triggered Photodynamic Therapy in a Tumor Mouse Model
Language English Country Germany Media print-electronic
Document type Journal Article
- Keywords
- energy transfer, photodynamic therapy, phthalocyanine, singlet oxygen, upconversion nanospheres,
- MeSH
- Erbium chemistry pharmacology MeSH
- Neoplasms, Experimental drug therapy pathology MeSH
- Fluorides chemistry pharmacology MeSH
- Photochemotherapy * MeSH
- Photosensitizing Agents chemical synthesis chemistry pharmacology MeSH
- Indoles chemistry pharmacology MeSH
- Isoindoles MeSH
- Humans MeSH
- Molecular Structure MeSH
- Mice, Nude MeSH
- Mice MeSH
- Cell Line, Tumor MeSH
- Nanospheres chemistry MeSH
- Silicon Dioxide chemistry pharmacology MeSH
- Cell Proliferation drug effects MeSH
- Antineoplastic Agents chemical synthesis chemistry pharmacology MeSH
- Drug Screening Assays, Antitumor MeSH
- Dose-Response Relationship, Drug MeSH
- Structure-Activity Relationship MeSH
- Ytterbium chemistry pharmacology MeSH
- Yttrium chemistry pharmacology MeSH
- Animals MeSH
- Check Tag
- Humans MeSH
- Mice MeSH
- Female MeSH
- Animals MeSH
- Publication type
- Journal Article MeSH
- Names of Substances
- Erbium MeSH
- Fluorides MeSH
- Photosensitizing Agents MeSH
- Indoles MeSH
- Isoindoles MeSH
- Silicon Dioxide MeSH
- phthalocyanine MeSH Browser
- Antineoplastic Agents MeSH
- sodium yttriumtetrafluoride MeSH Browser
- Ytterbium MeSH
- Yttrium MeSH
Photodynamic therapy (PDT) has garnered immense attention as a minimally invasive clinical treatment modality for malignant cancers. However, its low penetration depth and photodamage of living tissues by UV and visible light, which activate a photosensitizer, limit the application of PDT. In this study, monodisperse NaYF4 :Yb3+ /Er3+ nanospheres 20 nm in diameter, that serve as near-infrared (NIR)-to-visible light converters and activators of a photosensitizer, were synthesized by high-temperature co-precipitation of lanthanide chlorides in a high-boiling organic solvent (octadec-1-ene). The nanoparticles were coated with a thin shell (≈3 nm) of homogenous silica via the hydrolysis and condensation of tetramethyl orthosilicate. The NaYF4 :Yb3+ /Er3+ @SiO2 particles were further functionalized by methacrylate-terminated groups via 3-(trimethoxysilyl)propyl methacrylate. To introduce a large number of reactive amino groups on the particle surface, methacrylate-terminated NaYF4 :Yb3+ /Er3+ @SiO2 nanospheres were modified with a branched polyethyleneimine (PEI) via Michael addition. Aluminum carboxyphthalocyanine (Al Pc-COOH) was then conjugated to NaYF4 :Yb3+ /Er3+ @SiO2 -PEI nanospheres via carbodiimide chemistry. The resulting NaYF4 :Yb3+ /Er3+ @SiO2 -PEI-Pc particles were finally modified with succinimidyl ester of poly(ethylene glycol) (PEG) in order to alleviate their future uptake by the reticuloendothelial system. Upon 980 nm irradiation, the intensive red emission of NaYF4 :Yb3+ /Er3+ @SiO2 -PEI-Pc-PEG nanoparticles completely vanished, indicating efficient energy transfer from the nanoparticles to Al Pc-COOH, which generates singlet oxygen (1 O2 ). Last but not least, NaYF4 :Yb3+ /Er3+ @SiO2 -PEI-Pc-PEG nanospheres were intratumorally administered into mammary carcinoma MDA-MB-231 growing subcutaneously in athymic nude mice. Extensive necrosis developed at the tumor site of all mice 24-48 h after irradiation by laser at 980 nm wavelength. The results demonstrate that the NaYF4 :Yb3+ /Er3+ @SiO2 -PEI-Pc-PEG nanospheres have great potential as a novel NIR-triggered PDT nanoplatform for deep-tissue cancer therapy.
References provided by Crossref.org
Single-Nanocrystal Studies on the Homogeneity of the Optical Properties of NaYF4:Yb3+,Er3
Magnetic Temperature-Sensitive Solid-Lipid Particles for Targeting and Killing Tumor Cells
