Synthesis and characterization of aminolevulinic acid gold nanoparticles: Photo and sonosensitizer agent for atherosclerosis

dc.creatorGONCALVES, KARINA de O.
dc.creatorVIEIRA, DANIEL P.
dc.creatorCOURROL, LILIA C.
dc.date2018
dc.date2018-09-24T17:50:52Z
dc.date2018-09-24T17:50:52Z
dc.date.accessioned2023-09-28T14:08:28Z
dc.date.available2023-09-28T14:08:28Z
dc.identifier0022-2313
dc.identifierhttp://repositorio.ipen.br/handle/123456789/29199
dc.identifier197
dc.identifier10.1016/j.jlumin.2018.01.057
dc.identifier73.158
dc.identifier73.60
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8999441
dc.descriptionPhotodynamic and sonodynamic therapies (PDT and SDT, respectively) are emerging as new atherosclerosis treatments. The subsequent generation of free radicals by activated photo and sonosensitizers can lead to apoptotic cell death. The use of gold nanoparticles (AuNPs) as the vehicle for a sensitizer delivery improves reactive oxygen species formation and sensitizer performance. In this study gold nanoparticles functionalized with polyethylene glycol (PEG) were synthesized mixing ??-aminolevulinic acid (ALA) with tetrachloroauric (III) acid in milliQ water solution followed by photo reduction with 300W xenon lamp. The synthesized ALA:AuNPs were characterized by UV/vis optical absorption, zeta potential and electron microscopy. The mean particle size of spherical ALA:AuNP was ~ 18 nm, with a polydispersity index of 0.437. Singlet oxygen generation efficiency was measured using the trap molecule 1,3-diphenylisobenzofuran. ALA:AuNPs and DPBF were irradiated with 590 nm LED, or pulse ultrasound irradiation (1 W/cm2 with 1.0 MHz), and consumption of the DPBF was monitored over time by the absorption and emission spectra. The results showed that he gold nanoparticles generate singlet oxygen during light and ultrasound irradiations. THP-1 cells differentiated into macrophages cytotoxicity test were described and was found the half maximal inhibitory concentration (IC50) values ~ 36 nM for ALA:AuNPs. Increase in the fluorescence intensity of PpIX extracted from macrophages incubated with ALA:AuNPs indicating stable encapsulation of ALA into gold nanoparticles and further conversion to PpIX. The potential use of ALA:AuNps as a sensitizer for photo and sonodynamic therapies were investigated. ALA:AuNPs mediated SDT was more effective than PDT. SDT with ALA:AuNPs induced the reduction of macrophage viability in ~ 87,5% in only 2 min. The mechanism underlying SDT-induced apoptosis involves the generation of singlet oxygen. The results indicate that ALA:AuNPs can be used as a novel photo and sonosensitizer for atherosclerosis.
dc.descriptionFunda????o de Amparo ?? Pesquisa do Estado de S??o Paulo (FAPESP)
dc.descriptionFAPESP: 10/016544-1
dc.format317-323
dc.relationJournal of Luminescence
dc.rightsopenAccess
dc.subjectaluminium arsenides
dc.subjectaminolevulinic acid
dc.subjectaqueous solutions
dc.subjectarteriosclerosis
dc.subjectelectron microscopy
dc.subjectemission spectra
dc.subjectgold
dc.subjectmacrophages
dc.subjectnanoparticles
dc.subjectoxygen
dc.subjectparticle size
dc.subjectpolyethylene glycols
dc.subjectpulsed irradiation
dc.subjectsensitizers
dc.subjectsynthesis
dc.titleSynthesis and characterization of aminolevulinic acid gold nanoparticles: Photo and sonosensitizer agent for atherosclerosis
dc.typeArtigo de peri??dico
dc.coverageI


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