Delivery Guaranteed

It can be decades before a scientific discovery leads to a treatment. A prime example of this is the discovery of RNA interference—a mechanism by which cells are able to silence specific genes using molecules known as small interfering RNA (siRNA). The discovery, which was made more than two decades ago, was lauded as a scientific breakthrough and won the two scientists who made the finding a Nobel Prize for Medicine.  

 

But a transformative therapy based on this discovery has remained elusive. This is partly because targeting siRNAs to disease targets—for example, cancer cells—remains a challenge.

 

UHN researcher Dr. Kazuhiro Yasufuku recently published a report describes a new siRNA technology that takes advantage of nanotechnology to overcome this hurdle to deliver siRNA to lung cancer cells.

 

For the study, Dr. Yasufuku and his team obtained tissues from patients with lung cancer and looked for genes that were highly expressed in lung cells and linked to cancer cell growth. They discovered more than sixty genes that were essential for lung cancer cell growth and selected one—kinesin family member-11 (KIF-11)—for further investigation.

 

The researchers then generated an siRNA molecule that targets KIF-11 and linked it to a tiny particle (nanoparticle) that recognizes and infiltrates cancer cells. These newly designed nanoparticles significantly reduced the levels of KIF-11 gene expression and dramatically slowed cancer growth in an experimental model of lung cancer. 

 

Explains Dr. Yasufuku “Our study demonstrates that it is possible to develop siRNAs that specifically target cancer cells. We are continuing to refine this technique in hopes of developing customized siRNA treatments for patients with advanced lung cancer who currently have little to no therapeutic options and high rates of mortality.”