Introduction: Nano drug delivery is a broad field of research on the development of novel
nano- carrier systems for effective therapeutic delivery of drugs. Here, an anticancer drug, cisplatin
(CDDP) conjugated Gold Nanoparticles (GNPs) via L-Lysine (Lys) linker.
Methods: The produced nanodrug (GNPs-Lys-CDDP) was characterized by UV-Vis spectroscopy,
Dynamic Light Scattering (DLS), Zeta potentials and electron force microscopy. The cytotoxic efficacy
of the GNPs-Lys-CDDP against human breast cancer cells (SKBR3) and normal cells (MCF-
10A) was evaluatedby MTT assay. Cell apoptosis and morphology changes were assessed by
flowcytometery and Acridine Orange/Ethidium Bromide (AO/EtBr) staining, respectively.
Results: It was found that the GNPs-Lys-CDDP with a size of 85 nm and negatively charged with
a zeta-potential of about -25 mV could be taken up by tumor cells. A marked change in the UV
spectrum of GNPs-Lys-CDDP compare to GNPs showed a strong absorption shift in the 525 nm region.
The LD 50 of GNPs-Lys-CDDP against SKBR3 (1 μg.mL -1), was found to be 8 times lower
than that of naked CDDP against SKBR3 (8 μg.mL -1). The nanocomplex GNPs-Lys-CDDP also
significantly increased the apoptosis of SKBR3 with the lowest cytotoxic effects on normal cells.
Discussion: This work indicates that GNPs effectively could decrease the lethal dose of CDDP to
87%. Hence, GNPs modified by Lys, could be a good nano-carrier for chemotherapeutic drugs.