Cited by 35Pancreatic function and diabetesVirus-based gene therapy researchViral Infectious Diseases and Gene Expression in Insects

Regulatable production of insulin from primary-cultured hepatocytes: Insulin production is up-regulated by glucagon and cAMP and down-regulated by insulin

Lu, D, Tamemoto, H, Shibata, H, Saito, I, Takeuchi, T·1998·Gene Therapy

Abstract

To utilize hepatocytes for insulin-producing surrogate cells, we devised a regulatory secretion system by placing proinsulin DNA under the regulatable promoter for phosphoenolpyruvate carboxykinase (PEPCK). The expression of PEPCK is down-regulated by insulin, and up-regulated by cAMP and glucagon. To express insulin in hepatocytes, we constructed an adenoviral insulin expression system. After infection, the hepatocytes secreted immunoreactive insulin (IRI) at an increasing rate. IRI secretion increased over four-fold upon stimulation with 300 microM cAMP and 500 microM of the cAMP-dependent phosphodiesterase inhibitor 3-isobutyl-1-methylxanthine (IBMX). This increase was also observed with glucagon and IBMX. Production was augmented two-fold by the addition of wortmannin, phosphatidylinositol (PI)-3-kinase inhibitor, suggesting that inhibitory insulin signaling to the PEPCK promoter may be mediated through PI-3-kinase. Addition of exogenous insulin to the culture decreased insulin mRNA expression remarkably on Northern blot. Thus, by using a PEPCK promoter for insulin expression, we were able to up-regulate insulin production from hepatocytes with cAMP and glucagon, and down-regulate with insulin itself.

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Crossref · 10.1038/sj.gt.3300677

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Authors
Lu, D., Tamemoto, H., Shibata, H., Saito, I., & Takeuchi, T.
Affiliations
  • Gunma University (JP)
  • Institute of Medical Science, The University of Tokyo (JP)
Venue
Gene Therapy
Published
1998-07-01
Volume
5
Issue
7
Pages
888-895
ISSN
  • 0969-7128 (ISSN-L)
  • 1476-5462
OpenAlex
W2319240083
Cited by
35
References
45
Citations by year
2022: 1 · 2021: 1 · 2020: 1 · 2019: 1 · 2016: 1 · 2013: 2 · 2012: 2
FWCI
4.30
Type
journal article
Language
en
Open access
closed
Locations
  • Gene Therapy (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Virus-based gene therapy research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Viral Infectious Diseases and Gene Expression in Insects
Keywords
insulin production, primary hepatocytes, insulin-producing cells, cyclic AMP, glucagon, insulin signaling, PI3-kinase, wortmannin, 3-isobutyl-1-methylxanthine, adenoviral gene transfer, insulin secretion regulation
MeSH terms
Wortmannin, Cyclic AMP, Adenoviridae, Androstadienes, Animals, Cells, Cultured, Gene Expression Regulation, Genetic Vectors, Glucagon, Insulin, Insulin Antagonists, Liver, Male, Phosphoenolpyruvate Carboxykinase (GTP), Proinsulin, 1-Methyl-3-isobutylxanthine, Genetic Therapy, Rats, Wistar, Gene Transfer Techniques, Rats

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