Journal
SMALL
Volume 14, Issue 15, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201704039
Keywords
controlled-release; copolymer hydrogels; functional nucleic acids; phospholipid systems; stimuli-responsive
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Funding
- Fundamental Research Funds for Central Universities (China)
- National Natural Science Foundation of China [21505078]
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A novel stimuli-responsive hydrogel system with liposomes serving as both noncovalent crosslinkers and functional small molecules carriers for controlled-release is developed. Liposomes can crosslink polyacrylamide copolymers functionalized with cholesterol-modified DNA motifs to yield a DNA hydrogel system, due to the hydrophobic interaction between cholesteryl groups and the lipid bilayer of liposomes. Functional information encoded DNA motifs on the polymer backbones endow the hydrogel with programmable smart responsive properties. In a model system, the hydrogel exhibits stimuli-responsive gel-to-sol transformation triggered by the opening of DNA motifs upon the presence of a restriction endonuclease enzyme, EcoR I, or temperature change, realizing the controlled-release of liposomes which are highly efficient carriers of active small molecules payloads. Two active molecules, 1,1-dioctadecyl-3,3,3,3-tetramethylindodicarbocyanine perchlorate (DiIC18(5)) and calcein, are chosen as the hydrophobic and hydrophilic model payloads, respectively, to address the feasibility of the releasing strategy. Moreover, the hydrogel exhibits injectable property as well as self-recovery behaviors.
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