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Related Experiment Videos

Peripheral nerve structure and function in long-term galactosemic dogs: morphometric and electron microscopic

K Sugimoto1, T Kasahara, H Yonezawa

  • 1Department of Pathology, Hirosaki University, School of Medicine, Japan.

Acta Neuropathologica
|April 20, 1999
PubMed
Summary

Chronic galactosemia in dogs causes mild peripheral nerve changes, unlike in rats. This suggests species-dependent severity in diabetic neuropathy models.

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Area of Science:

  • Biochemistry
  • Neuroscience
  • Animal Models

Background:

  • Experimental galactosemia activates the polyol pathway, modeling diabetic complications.
  • Diabetic neuropathy is severe in galactosemic rats, but poorly characterized in dogs.

Purpose of the Study:

  • To investigate peripheral nervous system (PNS) changes in dogs with chronic galactosemia.
  • To compare canine galactosemia-induced neuropathy to existing rat models.

Main Methods:

  • Biochemical, electrophysiological, and morphometric studies on PNS of dogs on a 30% galactose diet for 44 months.
  • Control group received a 30% cellulose diet.
  • Analysis included sciatic nerve biochemistry, nerve conduction studies, and nerve fiber morphometry.

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Main Results:

  • Galactosemia led to galactitol accumulation and decreased myo-inositol in sciatic nerves.
  • No significant electrophysiological or teased fiber abnormalities were found in ulnar and peroneal nerves.
  • Morphometric analysis showed mild myelinated fiber atrophy and reduced occupancy rate in peroneal nerves.
  • Anterior mesenteric ganglion neurons showed a slight but significant increase in cell size without degenerative changes.

Conclusions:

  • Chronic galactosemia in dogs induces mild structural and functional changes in the PNS.
  • These changes differ from those observed in galactosemic rat models.
  • The severity of peripheral neuropathy in galactosemia models appears to be species-dependent.