Related Experiment Videos
Human liver-derived cells stably modified for regulated proinsulin secretion function as bioimplants in vivo
Xiang Chen1, Jawahar G Patil, Serene H L Lok
1Division of Medical Sciences, National Cancer Centre, Singapore and Department of Biochemistry, National University of Singapore, Singapore.
The Journal of Gene Medicine
|July 19, 2002
Summary
Researchers engineered liver cells to produce insulin, offering a potential new treatment for diabetes. These modified cells demonstrated stable insulin production in lab tests and in animal models, paving the way for future bioimplant therapies.
Area of Science:
- Cell biology
- Metabolic disease research
- Bioengineering
Background:
- Current diabetes treatments like insulin injections and transplants have limitations.
- Developing alternative insulin-producing cells is crucial for diabetes management.
- Hepatocytes are promising candidates due to their natural glucose responsiveness and liver's signaling capabilities.
Purpose of the Study:
- To engineer human liver-derived cells for regulated insulin production.
- To assess the in vitro and in vivo functionality of these modified cells for diabetes treatment.
Main Methods:
- Human liver-derived Chang cells were genetically modified to express human proinsulin cDNA.
- A bifunctional promoter controlled gene expression in response to glucose and zinc.
- Stable cell clones were evaluated for proinsulin secretion in vitro and in vivo.
Main Results:
- Transfected Chang cells stably secreted proinsulin in response to glucose and zinc for over a year.
- Glucose and zinc synergistically boosted proinsulin production up to 30-fold.
- Implanted cells secreted proinsulin in mice, with levels increasing after glucose and zinc administration.
Conclusions:
- This study demonstrates stable proinsulin production in engineered human liver cells.
- The engineered hepatocytes show functional activity both in vitro and in vivo.
- These findings support the potential of hepatocytes as bioimplants for future diabetes therapy.