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Related Concept Videos

Type I Diabetes II: Pathophysiology01:26

Type I Diabetes II: Pathophysiology

Type 1 diabetes mellitus arises from an immune-mediated destruction of pancreatic β-cells, resulting in an absolute deficiency of insulin. This process develops in genetically susceptible individuals when autoimmunity, environmental exposures, and immunologic dysregulation converge to trigger a targeted attack on the insulin-producing cells of the pancreas. The β-cells are located within the islets of Langerhans and are essential for regulating blood glucose by facilitating cellular uptake of...

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Surgical Injury to the Mouse Pancreas through Ligation of the Pancreatic Duct as a Model for Endocrine and Exocrine Reprogramming and Proliferation
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Increased islet apoptosis in Pdx1+/- mice.

James D Johnson1, Noreen T Ahmed, Dan S Luciani

  • 1Renal Division, Department of Internal Medicine, Washington University School of Medicine/Barnes-Jewish Hospital, 660 S. Euclid Avenue, St. Louis, MO 63110, USA.

The Journal of Clinical Investigation
|April 17, 2003
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Partial Pdx1 deficiency in mice impairs pancreatic beta cell function and leads to diabetes. Increased apoptosis and reduced beta cell mass contribute to this organ-level defect.

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Area of Science:

  • Endocrinology
  • Developmental Biology
  • Genetics

Background:

  • PDX1 (pancreatic and duodenal homeobox 1) is crucial for pancreatic development.
  • Partial deficiency of PDX1 can impact glucose homeostasis.

Purpose of the Study:

  • To investigate the mechanisms underlying glucose intolerance in mice with partial Pdx1 deficiency.
  • To determine the impact of Pdx1 deficiency on beta cell function, survival, and islet architecture.

Main Methods:

  • Perfusion and static incubation of islets from Pdx1(+/-) and Pdx1(+/+) mice.
  • Assessment of glucose sensing, insulin secretion, and calcium responses in isolated islets and single beta cells.
  • Evaluation of apoptosis, beta cell mass, islet number, and inflammatory markers in vivo.

Main Results:

  • Pdx1(+/-) mice exhibited impaired glucose tolerance and reduced insulin release in vivo.
  • Islets from Pdx1(+/-) mice showed normal glucose-stimulated insulin secretion and calcium responses in vitro.
  • Pdx1(+/-) islets and beta cells were more susceptible to apoptosis, with reduced Bcl-XL and Bcl-2 expression.
  • In vivo, Pdx1(+/-) mice displayed abnormal islet architecture, increased apoptosis, and lymphocyte infiltration.
  • Beta cell mass and islet number were significantly reduced in aged Pdx1(+/-) mice.

Conclusions:

  • Partial Pdx1 deficiency leads to increased beta cell apoptosis and impaired islet regeneration.
  • These defects result in reduced beta cell mass and islet number, causing organ-level insulin secretion defects and diabetes.
  • Apoptosis and abnormal regulation of islet mass are key mechanisms in Pdx1 deficiency-induced diabetes.