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Researchers at Hokkaido University Have Reported New Data on Biomaterials

February 20, 2014

By a News Reporter-Staff News Editor at Gene Therapy Weekly -- Current study results on Biomaterials have been published. According to news reporting originating from Hokkaido, Japan, by NewsRx correspondents, research stated, "Biomembranes and cytoplasm, a diffusion-limited region for nanoparticles are critical barriers to be overcome for the successful gene delivery. We herein report on a neutral, and intracellularly degradable lipid nanoparticle (LNP), containing encapsulated plasmid DNA (pDNA) that can be effectively delivered to the nucleus."

Our news editors obtained a quote from the research from Hokkaido University, "A key material component in this particle is a vitamin A-scaffold SS-cleavable Proton-Activated Lipid-like Material ((SS)PalmA), which contains tertiary amine groups as proton sponge units that can respond to the acidic pH in endosomes, disulfide bonding for programmed collapse in the cytoplasm, and retinoic acid (RA) as a hydrophobic unit for assembly into LNP. LNP prepared using (SS)PalmA (LNP(PalmA)) exhibited a 15-fold higher gene expression activity compared to particles prepared with a simple acyl chain (myristoyl group)-scaffold one (LNPPalmM). Intracellular imaging studies revealed that LNP(PalmA) unexpectedly showed excessive endosome-disruptive characteristics. Furthermore, the decapsulation of pDNA slowly, but successively occurred in parallel with peri-nuclear accumulation. Nuclear targeting was blocked in the presence of native RA."

According to the news editors, the research concluded: "Collectively, LNP(PalmA) is an intelligent particle that passes through the cytoplasm in particle form with the aid of the intrinsic nuclear transport system of RA, and thereafter releases its encapsulated pDNA for effective gene expression."

For more information on this research see: Neutral biodegradable lipid-envelope-type nanoparticle using vitamin A-Scaffold for nuclear targeting of plasmid DNA. Biomaterials, 2014;35(5):1755-61. (Elsevier -; Biomaterials -

The news editors report that additional information may be obtained by contacting H. Tanaka, Faculty of Pharmaceutical Sciences, Hokkaido University, Kita 12 Nishi 6, Sapporo City, Hokkaido 060-0812, Japan. Additional authors for this research include H. Akita, R. Ishiba, K. Tange, M. Arai, K. Kubo and H. Harashima (see also Biomaterials).

Keywords for this news article include: Asia, Biotechnology, Japan, Hokkaido, Biomaterials, DNA Research, Gene Therapy, Bioengineering.

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Source: Gene Therapy Weekly

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