Freezing Assisted Protein Delivery by Using Polymeric Cryoprotectant

Abstract

A number of drug carrier systems such as liposomes, polymeric-nanoparticles, microparticles, polymeric micelles have been investigated for intracellular delivery. Among these liposomes are the potential drug vehicles for efficient cytosolic delivery. They have an adhesive property for cell membrane to encapsulate the drug or protein effectively and showing the enhanced absorption rate. One of the problems could be the difficulty of incorporation of the drug or protein into cell. Therefore many studies of the drug carriers have been developed to enhance the intracellular delivery of materials. Here we propose the novel method to improve the intracellular uptaking by using freeze concentration. Solutes are excluded from ice crystallization and concentrated in the remaining solution during freezing by freezing concentration. We have reported that polymeric cryoprotectant which is carboxylated poly-L-lysine was adsorbed on to the cell membrane during freezing and caused effective freeze concentration. In this study we investigated that delivery of protein effectively taking place by liposome as a carrier agent. It was successfully delivered protein to L929 cells via freeze concentration using polymeric cryoprotectant as a novel drug delivery.