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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Biodegradable and pH-Responsive Acetalated Dextran (Ac-Dex) Nanoparticles for NIR Imaging and Controlled Delivery of a Platinum-Based Prodrug into Cancer Cells

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Braga, Carolyne B. [1] ; Perli, Gabriel [1] ; Becher, Tiago B. [1] ; Omelas, Catia [1]
Total Authors: 4
[1] Univ Estadual Campinas, UNICAMP, Inst Chem, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: MOLECULAR PHARMACEUTICS; v. 16, n. 5, p. 2083-2094, MAY 2019.
Web of Science Citations: 0

Nanoparticles (NPs) based on the biodegradable acetalated dextran polymer (Ac-Dex) were used for near-infrared (NIR) imaging and controlled delivery of a Pt-IV prodrug into cancer cells. The Ac-Dex NPs loaded with the hydrophobic Pt(IV)prodrug 3 (Pt-IV/Ac-Dex NPs) and with the novel hydrophobic NIR-fluorescent dye 9 (NIR-dye 9/Ac-Dex NPs), as well as Ac-Dex NPs coloaded with both compounds (coloaded Ac-Dex NPs), were assembled using a single oil-in-water nanoemulsion method. Dynamic light scattering measurements and scanning electron microscopy images showed that the resulting Ac-Dex NPs are spherical with an average diameter of 100 nm, which is suitable for accumulation in tumors via the enhanced permeation and retention effect. The new nanosystems exhibited high drug-loading capability, high encapsulation efficiency, high stability in physiological conditions, and pH responsiveness. Drug-release studies clearly showed that the Pt(IV)prodrug 3 release from Ac-Dex NPs was negligible at pH 7.4, whereas at pH 5.5, this compound was completely released with a controlled rate. Confocal laser scanning microscopy unambiguously showed that the NIR-dye 9/Ac-Dex NPs were efficiently taken up by MCF-7 cells, and cytotoxicity assays against several cell lines showed no significant toxicity of blank Ac-Dex NPs up to 1 mg mL(-1). The IC(50 )values obtained for the Pt(IV)prodrug encapsulated in Ac-Dex NPs were much lower when compared with the IC50 values obtained for the free Pt(IV)complex and cisplatin in all cell lines tested. Overall, our results demonstrate, for the first time, that Ac-Dex NPs constitute a promising drug delivery platform for cancer therapy. (AU)

FAPESP's process: 18/02093-0 - Development of new nanomaterials for nanomedicine applications
Grantee:Cátia Cristina Capêlo Ornelas Megiatto
Support Opportunities: Regular Research Grants
FAPESP's process: 17/24488-3 - Development of nanostructured polysaccharide-based carriers for tunable release of antibiotics and silver nanoparticles
Grantee:Gabriel Perli
Support Opportunities: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 17/06146-8 - Development of nanocarriers based on dendrimers and polymer nanoparticles for selective delivery of goniothalamin, piplartine and Monastrol
Grantee:Carolyne Brustolin Braga
Support Opportunities: Scholarships in Brazil - Post-Doctoral