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Vascular Dysfunction in Horses with Endocrinopathic Laminitis.

Ruth A Morgan1,2, John A Keen2, Brian R Walker1

  • 1University/BHF Centre for Cardiovascular Science, The Queen's Medical Research Institute, University of Edinburgh, Edinburgh, United Kingdom.

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Summary
This summary is machine-generated.

Endocrinopathic laminitis (EL) in horses is linked to significant vascular and endothelial dysfunction in hoof and facial arteries. This systemic issue suggests a connection to underlying metabolic and hormonal conditions.

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Area of Science:

  • Veterinary Vascular Medicine
  • Equine Endocrinology
  • Laminitis Research

Background:

  • Endocrinopathic laminitis (EL) is a debilitating equine hoof condition associated with metabolic syndrome and Cushing's disease.
  • Vascular dysfunction, particularly endothelial dysfunction, is a known risk factor for cardiovascular issues in humans with similar metabolic and endocrine disorders.

Purpose of the Study:

  • To investigate the hypothesis that horses with EL exhibit vascular, specifically endothelial, dysfunction.
  • To compare vascular responses in horses with and without EL.

Main Methods:

  • Small vessel wire myography was used to study laminar arteries, laminar veins, and facial skin arteries from healthy horses (n=6) and horses with EL (n=6).
  • Vessel responses to vasoconstrictors (phenylephrine, 5-hydroxytryptamine) and the vasodilator acetylcholine were measured.

Main Results:

  • Horses with EL showed significantly reduced acetylcholine-induced relaxation in all studied vessels compared to healthy controls.
  • Contractile responses to phenylephrine and 5-hydroxytryptamine were increased in laminar veins of horses with EL.
  • Vascular sensitivity to phenylephrine was decreased in laminar arteries and veins from horses with EL.

Conclusions:

  • Horses with EL demonstrate significant vascular dysfunction in both laminar and facial skin arteries.
  • The systemic nature of these vascular abnormalities suggests they are linked to the underlying endocrinopathy, not just local hoof changes.