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The recently discovered small interfering RNA (siRNA) holds great promise in cancer therapy. However, efficient and safe delivery systems are required for the development of new therapeutic paradigms. Ovarian cancer has the highest mortality of all gynecologic tumors, and there is an urgent need for specific and effective therapies. The phosphatidylinositol 3-kinase/Akt pathway, which is strongly implicated in the biology of ovarian cancer, constitutes an attractive therapeutic target. In this study, we describe a triethanolamine-core poly(amidoamine) dendrimer which forms stable nanoparticles with the Akt siRNA, protects siRNA against RNase digestion, and is highly effective for initiating Akt target-gene silencing both in vitro and in vivo, while being minimally toxic. Most importantly, it could potentiate the antitumor effect of the anticancer drug paclitaxel. These results represent the proof-of-concept, demonstrating that dendrimer-mediated Akt siRNA delivery, in combination with a chemotherapeutic regimen, may constitute a promising nanomedicine approach in cancer therapy.

journal of medicinal chemistry

Combination of Dendrimer-Nanovector-Mediated Small Interfering RNA Delivery to Target Akt with the Clinical Anticancer Drug Paclitaxel for Effective and Potent Anticancer Activity in Treating Ovarian Cancer