Engineering oncogene-targeted anisamide-functionalized pBAE nanoparticles as efficient lung cancer antisense therapies

Non-small cell lung cancer (NSCLC) is one of the leading causes of worldwide death, mainly due to the lack of efficient and safe therapies. Currently, NSCLC standard of care for consist on the use of traditional chemotherapeutics, non-selectively distributed through the whole body, thus causing severe side effects while not achieving high efficacy outcomes. Consequently, the need of novel therapies, targeted to modify specific subcellular routes aberrantly expressed only in tumor cells is still urgent. In this context, the delivery of siRNAs that can know-down overexpressed oncogenes, such as mTOR, could become the promised targeted therapy. However, siRNA effective delivery remains a challenge due to its compromised stability in biological fluids and its inability to cross biological and plasmatic membranes. Therefore, polymeric nanoparticles that efficiently encapsulate siRNAs and are selectively targeted to tumor cells could play a pivotal role. Accordingly, we demonstrate in this work that oligopeptide end-modified poly(beta aminoester) (OM-pBAE) polymers can efficiently complex siRNA in small nanometric particles using very low polymer amounts, protecting siRNA from nucleases attack. These nanoparticles are stable in the presence of serum, advantageous fact in terms of in vivo use. We also demonstrated that they efficiently transfect cells in vitro, in the presence of serum and are able to knock down target gene expression. Moreover, we demonstrated their antitumor efficacy by encapsulating mTOR siRNA, as a model antisense therapy, which showed specific lung tumor cell growth inhibition in vitro and in vivo. Finally, through the addition of anisamide functionalization to the surface of the nanoparticles, we proved that they become selective to lung tumor cells, while not affecting healthy cells. Therefore, our results are a first step in the discovery of a tumor cell-targeted efficient silencing nanotherapy for NSCLC patients survival improvement.

Automated summary

Non-small cell lung cancer (NSCLC) is a leading cause of death worldwide, and current standard of care has limitations in terms of efficacy and safety. Targeted therapies that modify specific subcellular routes aberrantly expressed in tumor cells, such as siRNA delivery, could provide a promising solution. This study demonstrates that oligopeptide end-modified poly(beta aminoester) (OM-pBAE) polymers can efficiently encapsulate siRNA, protecting it from degradation and allowing for targeted delivery to tumor cells. These nanoparticles are stable in the presence of serum and have shown efficacy in inhibiting lung tumor cell growth both in vitro and in vivo. The addition of anisamide functionalization further enhances the selectivity of the nanoparticles to lung tumor cells. Overall, this research represents a significant step towards developing a targeted nanotherapy for improving survival in NSCLC patients.