Current Microbiology

, Volume 75, Issue 1, pp 92–98 | Cite as

Recombinant Mouse Osteocalcin Secreted by Lactococcus lactis Promotes Glucagon-Like Peptide-1 Induction in STC-1 Cells

  • Fu Namai
  • Suguru Shigemori
  • Koichi Sudo
  • Takashi Sato
  • Yoshinari Yamamoto
  • Shireen Nigar
  • Tasuku Ogita
  • Takeshi Shimosato


An osteoblastic protein, osteocalcin (OC), exists in vivo in two forms: carboxylated OC, and uncarboxylated or low-carboxylated OC (ucOC). ucOC acts as a hormone to regulate carbon and energy metabolism. Recent studies demonstrated that ucOC exerts insulinotropic effects, mainly through the glucagon-like peptide 1 (GLP-1) pathway. GLP-1 is an insulinotropic hormone secreted by enteroendocrine L cells in the small intestine. Thus, efficient delivery of ucOC to the small intestine may be a new therapeutic option for metabolic diseases such as diabetes and obesity. Here, we genetically engineered a lactic acid bacterium, Lactococcus lactis, to produce recombinant mouse ucOC. Western blotting showed that the engineered strain (designated NZ-OC) produces and secretes the designed peptide (rOC) in the presence of nisin, an inducer of the recombinant gene. Highly-purified rOC was obtained from the culture supernatants of NZ-OC using immobilized metal affinity chromatography. An in vitro assay showed that purified rOC promotes GLP-1 secretion in a mouse intestinal neuroendocrine cell line, STC-1, in a dose-dependent manner. These results clearly demonstrate that NZ-OC secretes rOC, and that rOC can promote GLP-1 secretion by STC-1 cells. Genetically modified lactic acid bacteria (gmLAB) have been proposed over the last two decades as an effective and low-cost mucosal delivery vehicle for biomedical proteins. NZ-OC may be an attractive tool for the delivery of rOC to trigger GLP-1 secretion in the small intestine to treat diabetes and obesity.



This study was funded by a Grant-in-Aid from the Japan Society for the Promotion of Science Fellows (No. 14J06317) to SS and a grant from the Faculty of Agriculture, Shinshu University, to TSh.

Compliance with Ethical Standards

Conflict of interest

The authors declare that they have no conflict of interest.


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© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  1. 1.Department of Food Production Science, Faculty of AgricultureShinshu UniversityKamiinaJapan
  2. 2.Department of Intestinal Ecosystem Regulation, Faculty of MedicineUniversity of TsukubaTsukubaJapan
  3. 3.Metabologenomics Core, Transborder Medical Research CenterUniversity of TsukubaTsukubaJapan
  4. 4.Department of Pulmonology, Graduate School of MedicineYokohama City UniversityYokohamaJapan
  5. 5.Department of Bioscience and Food Production Science, Interdisciplinary Graduate School of Science and TechnologyShinshu UniversityKamiinaJapan
  6. 6.Japan Society for the Promotion of ScienceTokyoJapan
  7. 7.Department of Nutrition and Food TechnologyJessore University of Science and TechnologyJessoreBangladesh
  8. 8.Department of Interdisciplinary Genome Sciences and Cell Metabolism, Institute for Biomedical SciencesShinshu UniversityKamiinaJapan
  9. 9.Research Center for Fungal and Microbial DynamismShinshu UniversityKamiinaJapan

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