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Related Experiment Videos

Aqueous flow in galactose-fed dogs.

Carol B Toris1, James T Lane, Yoshio Akagi

  • 1Department of Ophthalmology, University of Nebraska, 985840 Nebraska Medical Center, Omaha, 68198-5840, USA. ctoris@unmc.edu

Experimental Eye Research
|June 27, 2006
PubMed
Summary

Dogs fed galactose develop diabetes-like eye issues. This study found that galactosemic dogs have reduced aqueous humor flow, similar to diabetic patients, an irreversible condition potentially useful for diabetes research.

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Area of Science:

  • Ophthalmology
  • Endocrinology
  • Comparative Medicine

Background:

  • Galactose feeding in dogs induces diabetes-like ocular complications, including keratopathy, cataracts, and retinopathy.
  • Insulin-dependent diabetes mellitus is associated with altered aqueous humor dynamics in humans.

Purpose of the Study:

  • To investigate if galactosemic dogs exhibit reduced aqueous humor flow, mirroring observations in human diabetic patients.
  • To explore the potential of galactosemic dogs as an animal model for studying aqueous humor dynamics in diabetes.

Main Methods:

  • Twelve beagles were divided into three groups: Galactose (fed 30% galactose for 97 months), Reversal (galactose for 38 months, then standard diet), and Control (standard diet for 97 months).
  • Aqueous flow was measured using fluorophotometry.

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  • Intraocular pressure (IOP), anterior chamber depth, and histological changes were assessed.

    • Main Results:

    • Galactose-fed dogs showed significantly reduced aqueous flow (4.4±2.2 µL/min) compared to controls (6.8±2.4 µL/min).
    • The Reversal group also exhibited decreased aqueous flow (3.1±1.3 µL/min), indicating an irreversible effect.
    • Reduced aqueous flow correlated with morphological changes in the ciliary processes and was independent of retinopathy.

    Conclusions:

    • Galactose-fed dogs demonstrate reduced aqueous humor flow, similar to patients with insulin-dependent diabetes mellitus.
    • This reduction in aqueous flow is irreversible and occurs independently of retinopathy.
    • Galactosemic dogs serve as a valuable animal model for investigating aqueous humor dynamics in diabetes.