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Gut region-specific diabetic damage to the capillary endothelium adjacent to the myenteric plexus

Nikolett Bódi1, Petra Talapka, Marietta Zita Poles

  • 1Department of Physiology, Anatomy and Neuroscience, University of Szeged, Szeged, Hungary.

Microcirculation (New York, N.Y. : 1994)
|February 3, 2012
PubMed
Abstract

Insights

Diabetic damage affects gut capillaries, altering basement membrane morphology, tight junctions, and albumin transport. Insulin therapy can prevent these changes, suggesting endothelial cells are a regional target in diabetic enteric neuropathy.

Area of Science:

  • Gastroenterology
  • Diabetology
  • Vascular Biology

Background:

  • Diabetic enteric neuropathy is linked to damage in capillaries supplying the myenteric plexus (MP).
  • Understanding microvascular changes is crucial for addressing diabetic gastrointestinal complications.

Purpose of the Study:

  • To investigate the impact of streptozotocin (STZ)-induced diabetes on myenteric plexus (MP) capillary morphology and function.
  • To assess changes in basement membrane (BM), caveolar compartments, tight junctions (TJs), albumin transport, and Cav-1/eNOS expression.

Main Methods:

  • Comparison of gut segments from diabetic rats, insulin-treated diabetic rats, and control rats.
  • Morphometric analysis of BM, caveolar compartments, and TJs.
  • Postembedding immunohistochemistry for albumin transport, Cav-1, and eNOS.
  • Molecular methods to assess Cav-1 and eNOS expression.

Main Results:

  • Diabetes caused BM thickening, enlarged caveolar compartments, widened TJs, and enhanced albumin transport.
  • Overexpression of Cav-1 and eNOS was observed in diabetic capillaries.
  • Insulin treatment mitigated these diabetes-induced microvascular alterations.

Conclusions:

  • Endothelial cells in capillaries near the MP are regionally targeted by diabetic damage.
  • These findings provide morphological, functional, and molecular evidence of diabetic microvascular injury in the gut.

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