Síntese de nanopartículas de ouro modificadas para interações específicas in vitro com células neoplásicas

Abstract

The present work was aimed on the construction of a system using gold nanoparticles (AuNPs) with two targeting biomolecules, folic acid (HFol) and anti-folate receptor antibody, for application on in vitro tests with breast cancer cells MDA-MB-231 and MCF-7 to form a drug delivery system with anastrozole and tamoxifen. Among the different used adsorbates, the interactions of crystal violet (CV), mercaptoethanol (ME), HFol, polymer (PEGSH), anastrozole and tamoxifen, were analysed through electronic spectroscopy (UV-VIS-NIR), Raman and Surface Enhanced Raman Scattering (SERS). SERS spectroscopy was also applied on mapping of CV signal (SERS marker) of the complete systems with cancer cells MCF-7 in order to evaluate the effect of the presence or absence of these targeting biomolecules on the affinity with cancer cells. The performed mapping showed the relevance of the presence of the antibody by increasing from 13%, on the system with no biomolecules, to 30% of the CV signal, on the system with just antibody as biomolecule and increased from 30% to 65% in presence of HFol. AuNPs modified with folic acid and antibody, when conjugated with tamoxifen, reduced the minimum effective concentration of the drug in the action against MCF-7 cells, indicating that this system has a potential to be applied as a drug delivery system.