Monodisperse Rattle-Structured Gold Nanorod-Mesoporous Silica Nanoparticles Core–Shell as Sulforaphane Carrier and its Sustained-Release Property

Abstract

Sulforaphane (SF) was loaded into the multi-functioned rattle-structured gold nanorod mesoporous silica nanoparticles core-shell to improve its stability and efficacy through its efficient delivery to tumors. The rattle-structured gold nanorod mesoporous silica nanoparticles (rattle-structured AuNR@mSiO₂ core-shell NPs) were obtained by covering the surface of Au NPs with Ag and mSiO₂ shell and subsequently selective Ag shell etching strategy. Then the surface of rattle-structured AuNR@mSiO₂ NPs was decorated with thiolated polyethylene glycol-FITC and thiolated polyethylene glycol-folic acid to the designed form. The obtained FITC/FA@ [rattle-structured AuNR@mSiO₂] NPs was characterized by different techniques including energy dispersive X-ray spectroscopy (EDX), scanning and transmission electron microscopy (SEM & TEM), UV-visible spectrophotometer and dynamic light scattering (DLS). The FITC/FA@ [rattle-structured AuNR@mSiO₂] NPs has an average diameter around ~33 nm, which increases to ~38 nm after the loading of sulforaphane. The amount of the loaded drug was ~ 2.8×10-4 mol of SF per gram of FITC/FA@ [rattle-structured AuNR@mSiO₂] NPs. The rattle-structured AuNR@mSiO₂ and FITC/FA@ [rattle-structured AuNR@mSiO₂] NPs showed little inherent cytotoxicity, whereas the SF loaded FITC/FA@ [rattle-structured AuNR@mSiO₂] NPs was highly cytotoxic in the case of MCF-7 cell line. Finally, Fluorescence microscopy and flow cytometry were used to demonstrate that the nanoparticles could be accumulated in specific regions and SF loaded FITC/FA@ [Fe₃O₄@Au] NPs efficiently induce apoptosis in MCF-7 cell line [Graphical Abstract].

Graphical Abstract

Key words

Breast cancer - FITC and folic acid - in vitro and in vivo - Multi-functioned rattle-structured AuNR@mSiO₂ nanoparticles - Sulforaphane

• References

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