In vitro characterization of chemokine-loaded liposomes.

The recent emergence of immunotherapies is transforming cancer treatments. Although many cancer immunotherapies are finding enormous success for treating hematologic tumors, a major obstacle for the treatment of solid tumors is localizing immune cells to the tumor site. Therefore, we have developed a technology that is capable of directing immune cell migration. Specifically, we have packaged chemokines, signaling molecules that promote immune cell migration, inside polyethylene glycol decorated-liposomes. The release profiles of chemokines and other large molecules from the liposomes have been examined in serum-containing media. We have demonstrated that the liposomes are able to release chemokines to induce immune cell migration. Additionally, these liposomes have been shown in vitro to limit cancer cell growth through increased immune cell recruitment. This strategy of encapsulating chemokines within liposomes paves the way for additional cancer immunotherapies and chemokine-based therapies.