Secretory production system of bionanocapsules using a stably transfected insect cell line

Takuya Shishido, Masaru Muraoka, Masakazu Ueda, Masaharu Seno, Katsuyuki Tanizawa, Shun'ichi Kuroda, Hideki Fukuda, Akihiko Kondo

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Bionanocapsules (BNCs) are hollow nanoscale particles composed of L protein of the hepatitis B virus surface antigen that represent specific affinity for human hepatocytes. BNCs can transfer genes and drugs into human hepatocytes efficiently and specifically. BNC can be expressed in yeast cells. In this study, we developed a new L particle production system using a stably transfected insect cell line. For this purpose, we established a host-vector system using the Trichoplusia ni insect cell line. L particles were efficiently secreted by the overexpression of the L protein, which was fused to the secretion signal peptide. The concentration of L particles was reached approximately 1.7 μg/ml in 5 days during cultivation in a serum-free medium without antibiotic selective pressure. The production of L particles was maintained for at least 75 days. The secretory production of L particles facilitated their easy purification by chromatography. Furthermore, it was demonstrated that purified L particles can transfect only human hepatocytes. Therefore, an insect cell expression system is an attractive tool for the production of BNC.

Original languageEnglish
Pages (from-to)505-511
Number of pages7
JournalApplied Microbiology and Biotechnology
Issue number3
Publication statusPublished - Dec 2006

ASJC Scopus subject areas

  • Biotechnology
  • Applied Microbiology and Biotechnology


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