Development of a thermoresponsive chitosan gel combined with human mesenchymal stem cells and desferrioxamine as a multimodal pro-angiogenic therapeutic for the treatment of critical limb ischaemia

Journal of Controlled Release : Official Journal of the Controlled Release Society
Conn L HastingsGarry P Duffy

Abstract

Critical limb ischaemia (CLI) is a debilitating ischaemic disease caused by vascular occlusion. Pro-angiogenic therapeutics have the potential to produce collateral vasculature, delaying or negating the need for amputation or invasive revascularisation. Thermoresponsive hydrogels can provide an in situ depot for the sustained release of drugs and provide protection and cohesion for encapsulated cells. Human mesenchymal stem cells (hMSCs) have demonstrated strong angiogenic potential in vitro and angiogenic efficacy in vivo. Desferrioxamine (DFO), a pharmacological activator of the pro-angiogenic hypoxia inducible factor-1α pathway, has shown pro-angiogenic efficacy in vivo. This study combined hMSCs and DFO with a thermoresponsive chitosan/β-glycerophosphate (β-GP) gel, to function as an injectable, multimodal, pro-angiogenic therapeutic for the treatment of CLI. This gel underwent a thermogelation beginning at 33°C, and provided a sustained, biologically active release of DFO over the space of seven days, whilst permitting the survival, proliferation and migration of encapsulated hMSCs. hMSCs encapsulated in gel containing a 100μM concentration of DFO displayed an upregulation in VEGF expression. The combination of hMSCs and D...Continue Reading

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Citations

May 17, 2013·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Rosanne RafterySally-Ann Cryan
Dec 17, 2014·Carbohydrate Polymers·Hui Yun ZhouXi Guang Chen
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