A comparison of thiolated and disulfide-crosslinked polyethylenimine for nonviral gene delivery.

Abstract:

:Branched polyethylenimine (25 kDa) is thiolated and compared with redox-sensitive crosslinked derivatives. Both polymers thiol contents are assessed; the thiolated polymers have 390-2300 mmol SH groups/mol, whereas the crosslinked polymers have lower thiol contents. Cytotoxicity assays show that both modified polymers give lower hemolysis than unmodified PEI. Increased thiol content increases gene transfer efficiency but also elevates cytotoxicity. Crosslinking improves plasmid DNA condensation and enhances transfection efficiency, but extensive crosslinking overstabilizes the polyplexes and decreases transfection, emphasizing the need to balance polyplex stabilization and unpacking. Thus, at low levels of crosslinking, 25 kDa PEI can be an efficient redox-sensitive carrier system.

journal_name

Macromol Biosci

authors

Aravindan L,Bicknell KA,Brooks G,Khutoryanskiy VV,Williams AC

doi

10.1002/mabi.201300103

subject

Has Abstract

pub_date

2013-09-01 00:00:00

pages

1163-73

issue

9

eissn

1616-5187

issn

1616-5195

journal_volume

13

pub_type

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