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Related Experiment Videos

Can we create new organs from our own tissues?

S Ferber1

  • 1Endocrine Institute, Sheba Medical Center, Tel-Hashomer, Israel. sferber@netvision.net.il

The Israel Medical Association Journal : IMAJ
|July 26, 2000
PubMed
Summary

Scientists reprogrammed mouse liver cells into insulin-producing beta cells using the PDX-1 gene. This breakthrough offers a potential new therapy for diabetes by creating "self" cells to restore normal blood sugar levels.

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Area of Science:

  • Regenerative Medicine
  • Genetic Engineering
  • Metabolic Disorders

Background:

  • Novel therapeutic methods are emerging from new technologies.
  • Pluripotent stem cells and genetic engineering offer solutions for organ scarcity and immune rejection.
  • Insulin-dependent diabetes mellitus is a prevalent metabolic disorder that could benefit from these advancements.

Purpose of the Study:

  • To review potential future methods for curing metabolic disorders like diabetes.
  • To analyze the capacity of "master regulator" genes to genetically manipulate tissue development in vivo.
  • To investigate if the Pancreatic and Duodenal Homeobox gene-1 (PDX-1) can induce a beta cell phenotype in liver tissue.

Main Methods:

  • Systemic delivery of the PDX-1 homeobox gene to mouse liver using recombinant adenovirus technology.
  • Analysis of endogenous gene expression for insulin 1, insulin 2, and pro-insulin convertase.
  • Measurement of hepatic and plasma immunoreactive insulin levels.
  • Assessment of the biological activity of PDX-1-induced insulin in ameliorating hyperglycemia in diabetic mice.

Main Results:

  • PDX-1 activated silent mouse insulin 1, insulin 2, and pro-insulin convertase gene expression in the liver.
  • PDX-1 expression led to a 25-fold increase in hepatic and a threefold increase in plasma immunoreactive insulin.
  • The induced hepatic insulin was biologically active and ameliorated hyperglycemia in diabetic mice.

Conclusions:

  • PDX-1 can reprogram extra-pancreatic tissue, such as the liver, toward a beta cell phenotype.
  • This reprogramming generates "self" surrogate beta cells.
  • This approach offers a promising strategy for replacing impaired islet cell function in diabetes.

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