eCite Digital Repository
Human liver-derived cells stably modified for regulated proinsulin secretion function as bioimplants in vivo
Citation
Chen, X and Patil, JG and Lok, SHL and Kon, OL, Human liver-derived cells stably modified for regulated proinsulin secretion function as bioimplants in vivo, Journal of Gene Medicine, 4, (4) pp. 447-458. ISSN 1099-498X (2002) [Refereed Article]
Copyright Statement
Copyright 2002 John Wiley and Sons Ltd.
DOI: doi:10.1002/jgm.263
Abstract
Background: Insulin deficiency is currently treated with pharmacological insulin secretagogues, insulin injections or islet transplants. Secondary failure of pharmacological agents is common; insulin injections often fail to achieve euglycemic control; and islet transplants are rare. Non-β cells capable of regulated insulin secretion in vivo could be a functional cure for diabetes. Hepatocytes are good candidates, being naturally glucose-responsive, protein-secreting cells, while the liver is positioned to receive direct nutrient signals that regulate insulin production. Methods: Human liver-derived Chang cells were modified with a plasmid construct in which a bifunctional promoter comprising carbohydrate response elements and the human metallothionein IIA promoter controlled human proinsulin cDNA expression. Secretory responses of stable cell clones were characterized in vitro and in vivo by proinsulin radioimmunoassay. Results: Transfected Chang cells secreted 5-8 pmol proinsulin/ 106 cells per 24 h in continuous passage for at least a year in response to 5-25 mM glucose and 10-90 μM zinc in vitro. Glucose and zinc synergistically increased proinsulin production by up to 30-fold. Non-glucose secretagogues were also active. Glucose transporter 2 (GLUT2) and glucokinase cDNA co-transfection enhanced glucose responsiveness. Intraperitoneally implanted Chang cells secreted proinsulin in scid and Balb/c mice. Serum proinsulin levels were further increased 1.3-fold (p<0.05) after glucose and 1.4- to 1.6-fold (p<0.005) after zinc administration in vivo. Conclusions: These results are the first to demonstrate stable proinsulin production in a human liver-derived cell line with activity in vitro and in vivo and provide a basis for engineering hepatocytes as in vivo bioimplants for future diabetes treatment. Copyright © 2002 John Wiley & Sons, Ltd.
Item Details
Item Type: | Refereed Article |
---|---|
Keywords: | Diabetes; Glucose-inducible; Hepatocyte; Zinc-inducible; carbohydrate; complementary DNA; glucokinase; glucose; glucose transporter 2; proinsulin; zinc; proinsulin; animal experiment; article; cell based gene therapy; cell clone; controlled study |
Research Division: | Biomedical and Clinical Sciences |
Research Group: | Medical biochemistry and metabolomics |
Research Field: | Medical biochemistry - nucleic acids |
Objective Division: | Health |
Objective Group: | Clinical health |
Objective Field: | Clinical health not elsewhere classified |
UTAS Author: | Patil, JG (Dr Jawahar Patil) |
ID Code: | 96249 |
Year Published: | 2002 |
Web of Science® Times Cited: | 9 |
Deposited By: | NC Ports and Shipping |
Deposited On: | 2014-10-28 |
Last Modified: | 2014-11-25 |
Downloads: | 0 |
Repository Staff Only: item control page