A stimuli responsive liposome loaded hydrogel provides flexible on-demand release of therapeutic agents

• Published in: Acta biomaterialia 2017-01, Vol.48, p.110-119
• Main Authors: O’Neill, Hugh S., Herron, Caroline C., Hastings, Conn L., Deckers, Roel, Lopez Noriega, Adolfo, Kelly, Helena M., Hennink, Wim E., McDonnell, Ciarán O., O’Brien, Fergal J., Ruiz-Hernández, Eduardo, Duffy, Garry P.
• Format: Article
• Language: English
• Subjects: Angiogenesis; Biocompatible Materials - pharmacology; Cell migration; Cell Movement - drug effects; Chemical compounds; Chitosan; Chitosan - chemistry; Complications; Controlled release; Deferoxamine - pharmacology; Dosage; Drug delivery; Drug dosages; Drug Liberation; Drugs; Dual release; Encapsulation; Entrapment; Flexibility; Glycerophosphates - chemistry; Growth factor delivery; Hepatocyte growth factor; Hepatocyte Growth Factor - pharmacology; Humans; Hydrogel, Polyethylene Glycol Dimethacrylate - chemistry; Hydrogels; Hyperthermia; Hyperthermia, Induced; In vitro methods and tests; Kinetics; Liposomes; Mesenchymal Stromal Cells - cytology; Mesenchymal Stromal Cells - drug effects; Mesenchymal Stromal Cells - metabolism; Pharmacology; Reagents; Recruitment; Scheduling; Stability; Stem cells; Thermoresponsive hydrogel; Thermosensitive liposomes; Tissues; Vascular endothelial growth factor; Vascular Endothelial Growth Factor A - metabolism
• ISSN: 1742-7061; 1878-7568
• DOI: 10.1016/j.actbio.2016.10.001

[Display omitted] Lysolipid-based thermosensitive liposomes (LTSL) embedded in a chitosan-based thermoresponsive hydrogel matrix (denoted Lipogel) represents a novel approach for the spatiotemporal release of therapeutic agents. The entrapment of drug-loaded liposomes in an injectable hydrogel permits local liposome retention, thus providing a prolonged release in target tissues. Moreover, release can be controlled through the use of a minimally invasive external hyperthermic stimulus. Temporal control of release is particularly important for complex multi-step physiological processes, such as angiogenesis, in which different signals are required at different times in order to produce a robust vasculature. In the present work, we demonstrate the ability of Lipogel to provide a flexible, easily modifiable release platform. It is possible to tune the release kinetics of different drugs providing a passive release of one therapeutic agent loaded within the gel and activating the release of a second LTSL encapsulated agent via a hyperthermic stimulus. In addition, it was possible to modify the drug dosage within Lipogel by varying the duration of hyperthermia. This can allow for adaption of drug dosing in real time. As an in vitro proof of concept with this system, we investigated Lipogels ability to recruit stem cells and then elevate their production of vascular endothelial growth factor (VEGF) by controlling the release of a pro-angiogenic drug, desferroxamine (DFO) with an external hyperthermic stimulus. Initial cell recruitment was accomplished by the passive release of hepatocyte growth factor (HGF) from the hydrogel, inducing a migratory response in cells, followed by the delayed release of DFO from thermosensitive liposomes, resulting in a significant increase in VEGF expression. This delayed release could be controlled up to 14days. Moreover, by changing the duration of the hyperthermic pulse, a fine control over the amount of DFO released was achieved. The ability to trigger the release of therapeutic agents at a specific timepoint and control dosing level through changes in duration of hyperthermia enables sequential multi-dose profiles. This paper details the development of a heat responsive liposome loaded hydrogel for the controlled release of pro-angiogenic therapeutics. Lysolipid-based thermosensitive liposomes (LTSLs) embedded in a chitosan-based thermoresponsive hydrogel matrix represents a novel approach for the spatiotemporal release of the