Molecular analysis and bioactivity of luteinizing hormone from Japanese eel, Anguilla japonica, produced in silkworm pupae

Ji Hyun Choi, Dae Jung Kim, Sun Mee Hong, Sun Jung Jo, Kwan Sik Min, Young Chang Sohn, Jae Man Lee, Takahiro Kusakabe

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Luteinizing hormone (LH), a gonadotropin hormone (GTH) of the pituitary glycoprotein family, is important in oocyte maturation, ovulation, and spermiation. In this study, we generated a Japanese eel LH (JeLH) with and without the equine chorionic gonadotropin (eCG) carboxyl-terminal peptides under the control of the polyhedron in the silkworm pupae BES to determine their expression levels, glycosylation profile, and in vitro bioactivity. The target proteins were highly expressed in the pupae hemolymph. Recombinant JeLH·eCG and JeLH were N- or O-glycosylated, as shown by periodic-acid Schiff staining, deglycosidase enzyme treatment, and lectin blot analyses, and showed no significant difference in the in vitro bioactivity. Both single-chain hormones and salmon pituitary extract induced maturation of Japanese eel oocytes in vitro. Recombinant LHs produced in silkworm pupae might be suitable candidates for in vivo experiments, because they can be produced in sufficient amount and can undergo N-glycosylation.

Original languageEnglish
Pages (from-to)381-388
Number of pages8
JournalBiotechnology and Bioprocess Engineering
Issue number3
Publication statusPublished - Jun 1 2016


All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Bioengineering
  • Applied Microbiology and Biotechnology
  • Biomedical Engineering

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