Long-Term Expression with a Cationic Polymer Derived from a Natural Polysaccharide: Schizophyllan

Takeshi Nagasaki, Masaya Hojo, Atsushi Uno, Taku Satoh, Kazuya Koumoto, Masami Mizu, Kazuo Sakurai, Seiji Shinkai

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)


Among the various synthetic gene carriers based on biomaterials, cationic polymers with polysaccharide backbones have long been studied as nonviral vectors due to their low immunogenicity and high water solubility. Schizophyllan, a β-(1,3)-glucan, is one of the various polysaccharides that are clinically administered. Furthermore, its safety in the human body has already been confirmed. Various functional groups can be selectively introduced into the side chain, not into the main chain of schizophyllan. Therefore, we have synthesized various oligoamine conjugates from schizophyllan. It was confirmed that their in vitro transfection efficiencies are superior to that of polyethylenimine by adjusting the molecular weight and the degree of amination of cationic schizophyllan. While it was possible to reduce cytotoxicity by adjusting the amount of DNA complex per cell, as seen with poly-L-lysine, polyethylenimine, and chitosan, PEGylation was the most effective means of reducing toxicity. Furthermore, using cationic schizophyllan carriers, it was also possible to express a reporter protein for a long period of time due to a long residence time of plasmid DNA in cells.

Original languageEnglish
Pages (from-to)249-259
Number of pages11
JournalBioconjugate Chemistry
Issue number2
Publication statusPublished - 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Bioengineering
  • Biomedical Engineering
  • Pharmacology
  • Pharmaceutical Science
  • Organic Chemistry


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