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Related Concept Videos

iPS Cell Differentiation01:22

iPS Cell Differentiation

The ability of induced pluripotent stem cells or iPSCs to differentiate into most body cell types has stimulated repair and regenerative medicine research over the past few decades. iPSC-derived blood cells, hepatocytes, beta islet cells, cardiomyocytes, neurons, and other cell types can repair injuries or regenerate damaged tissue in diseases such as diabetes and neurodegenerative disorders.
EPS and iPS Cells in Disease Research01:21

EPS and iPS Cells in Disease Research

Embryonic and induced pluripotent stem cells are excellent models for disease research because of their ability to self-renew and differentiate into most cell types. Somatic cells from a patient are isolated and reprogrammed into induced pluripotent stem cells or iPSCs. These iPSCs are later differentiated into the desired cell type, which mirrors the diseased cell of the patient. In this way, disease models have been created for investigating diseases such as Down syndrome, type I diabetes,...

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Related Experiment Video

Updated: May 12, 2026

Leprdb Mouse Model of Type 2 Diabetes: Pancreatic Islet Isolation and Live-cell 2-Photon Imaging Of Intact Islets
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Pdx1 restores beta cell function in Irs2 knockout mice.

Jake A Kushner1, Jing Ye, Markus Schubert

  • 1Howard Hughes Medical Institute, Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts 02215, USA.

The Journal of Clinical Investigation
|May 8, 2002
PubMed
Summary
This summary is machine-generated.

Reduced Pdx1 expression in mice lacking Irs2 disrupts beta cell function, leading to diabetes. Restoring Pdx1 corrects this, suggesting a link between Pdx1 dysregulation and both type 2 diabetes and MODY.

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Area of Science:

  • Endocrinology
  • Molecular Biology
  • Genetics

Background:

  • The homeodomain transcription factor Pdx1 is crucial for pancreas development and beta cell function.
  • Mutations in Pdx1 and hepatocyte nuclear factors are linked to maturity-onset diabetes of the young (MODY).
  • Insulin/Igf signaling, particularly the Irs2 pathway, regulates beta cell growth and function.

Purpose of the Study:

  • To investigate the relationship between beta cell failure in Irs2(-/-) mice and the function of MODY-related transcription factors.
  • To determine if Pdx1 expression is altered in Irs2(-/-) mice before diabetes onset.
  • To explore the therapeutic potential of Pdx1 in ameliorating diabetes in Irs2(-/-) mice.

Main Methods:

  • Measurement of Pdx1 expression in pancreatic islets of young Irs2(-/-) mice.
  • Generation of Irs2(-/-) mice with varying Pdx1 gene dosage (Pdx1(+/+) and Pdx1(+/-)).
  • Transgenic expression of Pdx1 in Irs2(-/-) mice to assess its impact on beta cell function and glucose tolerance.

Main Results:

  • Pdx1 expression was reduced in islets of Irs2(-/-) mice prior to diabetes onset.
  • Male Irs2(-/-)Pdx1(+/+) mice developed diabetes, while haploinsufficiency of Pdx1 in Irs2(-/-) mice led to neonatal diabetes.
  • Transgenic Pdx1 expression rescued beta cell mass and function, promoting lifelong glucose tolerance in Irs2(-/-) mice.

Conclusions:

  • Dysregulation of Pdx1 is implicated in the beta cell failure observed in Irs2(-/-) mice.
  • Pdx1 deficiency exacerbates diabetes development in the context of impaired insulin signaling.
  • Restoration of Pdx1 offers a potential therapeutic strategy for diabetes, linking MODY and type 2 diabetes pathogenesis.