title: Assembly of multilayer PSS/PAH membrane on coherent alginate/PLO microcapsule for long-term graft transplantation.
abstract: Conventional alginate/poly-L-ornithine (AP) membranes used to immunoisolate foreign tissue transplants fail in long-term transplantations of immortal cell lines. We have developed a novel layer-by-layer (LbL) membrane using polystyrene sulfonate and polyallylamine hydrochloride (PSS/PAH) on top of the coherent AP membrane. Assembly of the LbL membrane was followed by electrophoresis, and the surface morphologies and structure were characterized and examined by cryo-scanning electron microscope and transmission electron microscopy. Unlike the standard AP membrane, the LbL membrane withstood the internal pressure generated by continuous cell proliferation of microencapsulated HEK-293 and Min-6 cells. The new membrane did not affect insulin secretion or diffusion by Min-6 cells.
authors.affiliation: Australian Institute of Bioengineering and Nanotechnology, University of Queensland, Brisbane, Queensland 4072, Australia.
authors.forename: Andy
authors.initials: A
authors.lastname: Leung
authors.forename: Matt
authors.initials: M
authors.lastname: Trau
authors.forename: Lars Keld
authors.initials: LK
authors.lastname: Nielsen
mesh_terms: D002214:Capsules / Q000737:chemistry*; D002460:Cell Line; D049109:Cell Proliferation / Q000187:drug effects; D017690:Cell Transplantation / Q000379:methods*; D006801:Humans; D007328:Insulin / Q000378:metabolism; D000078790:Insulin Secretion; D007668:Kidney / Q000166:cytology*; D008567:Membranes, Artificial; D011073:Polyamines; D011137:Polystyrenes; D013499:Surface Properties
chemical_list: D002214:Capsules; D007328:Insulin; D008567:Membranes, Artificial; D011073:Polyamines; D011137:Polystyrenes; C063994:polyallylamine; C003321:polystyrene sulfonic acid