title: Hyperglycemia and microangiopathy in the eel.
abstract: When female eels, fasting and sexually mature, were progressively adapted to cold water (2-4 degrees C), their blood sugar concentration rose to values averaging 600 mg/dl. Control eels, kept in warm water (18-20 degrees C), had a mean blood sugar concentration of 100 mg/dl. After a period of 5-6 mo, the blood capillaries of the rete mirabile in the swimbladder were examined in both control, low blood sugar eels, and in cold-adapted, high blood sugar eels. In the latter, the basal laminae of the capillaries were thickened; their amino acids composition was altered and the in vitro glucose carbon incorporation into basal laminae glycoproteins was increased over a wide range of medium glucose concentrations. Furthermore, the diffusion capacity of the rete, as measured with tracer molecules during steady-state conditions in a countercurrent perfusion system, was increased in the hyperglycemic eel. It is concluded that chronic hyperglycemia in the cold-adapted eel is associated with a microangiopathy characterized by morphologic, biochemical, and functional alterations.
mesh_terms: D000222:Adaptation, Physiological; D000400:Air Sacs / Q000098:blood supply; D000818:Animals; D003080:Cold Temperature; D003925:Diabetic Angiopathies / Q000209:etiology*; D004524:Eels / Q000378:metabolism*; D005260:Female; D006943:Hyperglycemia / Q000209:etiology*