Polyvalent Folate-Dendrimer-Coated Iron Oxide Theranostic Nanoparticles for Simultaneous Magnetic Resonance Imaging and Precise Cancer Cell Targeting.

The low therapeutic index of conventional chemotherapy and poor prognosis of patients diagnosed with metastatic cancers are prompting clinicians to adopt newer strategies to simultaneously detect cancer lesions at an early stage and to precisely deliver anticancer drugs to tumor sites. In this study, we employed a novel strategy to engineer a polyvalent theranostic nanocarrier consisting of superparamagnetic iron oxide nanoparticle core (SPIONs) decorated with folic acid-polyamidoamine dendrimers surface (FA-PAMAM). In addition, a highly potent hydrophobic anticancer agent 3,4-difluorobenzylidene-curcumin (CDF) was coloaded in the FA-PAMAM dendrimer to increase its solubility and assess its therapeutic potentials. The resulting targeted nanoparticles (SPIONs@FA-PAMAM-CDF) exhibited high MR contrast. When tested on folate receptor overexpressing ovarian (SKOV3) and cervical (HeLa) cancer cells, the CDF loaded targeted nanoformulations showed higher accumulation with a better anticancer activity as compared to the nontargeted counterparts, possibly due to multivalent folate receptor binding interaction with cells overexpressing the target. The results were corroborated by observation of a larger population of cells undergoing apoptosis due to upregulation of tumor suppressor phosphatase and tensis homologue (PTEN), caspase 3, and inhibition of NF-κB in groups treated with the targeted formulations, which further confirmed the ability of the multivalent theranostic nanoparticles for simultaneous imaging and therapy of cancers.