Virus-Like Particles That Can Deliver Proteins and RNA

The National Cancer Institute's Protein Expression Laboratory seeks parties interested in licensing the novel delivery of RNA to mammalian cells using virus-like particles.

Current methods of delivering proteins or RNA to mammalian cells are limited by a lack of target specificity and toxicity, among other shortcomings.  NCI researchers have created novel virus-like particles (VLPs) that are capable of binding to and replicating within a target mammalian cell, including human cells.  The claimed VLPs are safer than viral delivery because they are incapable of re-infecting target cells.  The present VLPs can optionally comprise inhibitory recombinant polynucleotides, such as microRNA, antisense RNA or small hairpin RNA, to down regulate or turn off expression of a particular gene within the target cell.  Alternatively, recombinant polynucleotides packaged within VLPs can comprise a gene encoding a therapeutic protein so as to enable expression of that protein within the target cell.   Specifically, VLPs of the invention are composed of an alphavirus replicon that contains a recombinant polynucleotide, a retroviral gag protein, and a fusogenic envelope glycoprotein.

 While the claimed VLPs have a variety of applications, therapeutic uses of the VLPs include directing antibody synthesis and converting cancer cells into antigen presenting cells. Additional applications include using VLPs to induce fast (approx. 3-4 hrs) and high levels of protein production in mammalian cells.