大澤　重仁    Department   Research Institutes and Facilities, Research Institutes and Facilities    Position
Article types	Original article
Language	English
Peer review	Peer reviewed
Title	Single-stranded DNA-packaged polyplex micelle as adeno-associated-virus-inspired compact vector to systemically target stroma-rich pancreatic cancer
Journal	Formal name：ACS nano. Abbreviation：ACS Nano ISSN code：19360851/1936086X
Domestic / Foregin	Foregin
Volume, Issue, Page	13(11),pp.12732-12742
Total page number	11
Author and coauthor	Theofilus A Tockary, Wanling Foo, Anjaneyulu Dirisala, Qixian Chen, Satoshi Uchida, Shigehito Osawa, Yuki Mochida, Xueying Liu, Hiroaki Kinoh, Horacio Cabral, Kensuke Osada, Kazunori Kataoka
Publication date	2019/10/24
Summary	Despite the rigidity of double-stranded DNA (dsDNA), its packaging is used to construct nonviral gene carriers due to its availability and the importance of its double-helix to elicit transcription. However, there is an increasing demand for more compact-sized carriers to facilitate tissue penetration, which may be easily fulfilled by using the more flexible single-stranded DNA (ssDNA) as an alternative template. Inspired by the adeno-associated virus (AAV) as a prime example of a transcriptionally active ssDNA system, we considered a methodology that can capture unpaired ssDNA within the polyplex micelle system (PM), an assembly of DNA and poly(ethylene glycol)-b-poly(l-lysine) (PEG-PLys). A micellar assembly retaining unpaired ssDNA was prepared by unpairing linearized pDNA with heat and performing polyion complexation on site with PEG-PLys. The PM thus formed had a compact and spherical shape, which was distinguishable from the rod-shaped PM formed from dsDNA, and still retained its ability to activate gene expression. Furthermore, we demonstrated that its capacity to encapsulate DNA was much higher than AAV, thereby potentially allowing the delivery of a larger variety of protein-encoding DNA. These features permit the ssDNA-loaded PM to easily penetrate the size-restricting stromal barrier after systemic application. Further, they can elicit gene expression in tumor cell nests of an intractable pancreatic cancer mouse model to achieve antitumor effects through suicide gene therapy. Thus, single-stranded DNA-packaged PM is appealing as a potential gene vector to tackle intractable diseases, particularly those with target delivery issues due to size-restriction barriers.
DOI	10.1021/acsnano.9b04676