Directing Assembly and Disassembly of 2D MoS2 Nanosheets with DNA for Drug Delivery.
Bang Lin LiMagdiel I SetyawatiLinye ChenJianping XieLok Kumar ShresthaChwee-Teck LimSlaven GarajDavid Tai LeongPublished in: ACS applied materials & interfaces (2017)
Layer-by-layer (LbL) self-assembled stacked Testudo-like MoS2 superstructures carrying cancer drugs are formed from nanosheets controllably assembled with sequence-based DNA oligonucleotides. These superstructures can disassemble autonomously in response to cancer cells' heightened ATP metabolism. First, we functionalize MoS2 nanosheets (MoS2-NS) nanostructures with DNA oligonucleotides having thiol-terminated groups (DNA/MoS2-NS) via strong binding to sulfur atom defect vacancies on MoS2 surfaces. The driving force to assemble into a higher-order DNA/MoS2-NS superstructure is guided by a linker aptamer that induced interlayer assembly. In the presence of target ATP molecules, these multilayer superstructures disassembled as a consequence of stronger binding of ATP molecules with the linking aptamers. This design plays a dual role of protection and delivery by LbL stacked MoS2-NS similar in concept to a Greek Testudo. These superstructures present a protective armor-like shell of MoS2-NS, which still remains responsive to small and infiltrating ATP molecules diffusing through the protective MoS2-NS, contributing to an enhanced stimuli-responsive drug release system for targeted chemotherapy.
Keyphrases
- quantum dots
- reduced graphene oxide
- transition metal
- room temperature
- visible light
- highly efficient
- circulating tumor
- sensitive detection
- dengue virus
- single molecule
- drug delivery
- gold nanoparticles
- nucleic acid
- cell free
- cancer therapy
- drug release
- squamous cell carcinoma
- ionic liquid
- zika virus
- escherichia coli
- molecular dynamics
- binding protein
- dna binding
- endothelial cells
- pseudomonas aeruginosa
- high glucose
- rectal cancer
- transcription factor