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. 1984 Nov;83(3):635–643. doi: 10.1111/j.1476-5381.1984.tb16217.x

Vascular reactivity in diabetes mellitus: possible role of insulin on the endothelial cell.

Z B Fortes, J Garcia Leme, R Scivoletto
PMCID: PMC1987095  PMID: 6439270

Abstract

The response to vasoactive agents of microvessels of the rat was tested in vivo by direct microscopic observation of the exteriorized mesentery and assessment of cutaneous vascular permeability changes with Evans blue. The constrictor response to a standard amount of noradrenaline in mesenteric microvessels was fully antagonized by acetylcholine in normal, diabetic, adrenalectomized and diabetic-adrenalectomized rats. In contrast, the minimum doses of histamine or bradykinin, effective in normal or adrenalectomized animals, had to be increased about 20 fold to be active in diabetic or diabetic-adrenalectomized animals. Topical application of insulin to mesenteric microvessels of diabetic animals, in amounts not causing any increase in serum insulin levels, improved or restored the capacity of the animals to respond to histamine or bradykinin, acting as antagonists of the vasoconstrictor response to noradrenaline. Topical insulin, however, was ineffective in normal animals given 2-deoxyglucose, the acute effects of which result from cellular glucopaenia unrelated to insulin deficiency. Vascular permeability responses to intracutaneous histamine or bradykinin were decreased in animals pretreated with 2-deoxyglucose as much as in diabetic animals. Pretreatment of normal animals with indomethacin produced no effect on the responses of these animals to histamine or bradykinin, tested as antagonists of noradrenaline on mesenteric microvessels, or as vascular permeability-increasing factors in the skin. Pretreatment of normal animals with chloroquine, mepacrine or dexamethasone had no effect on the reactivity of mesenteric microvessels to histamine and bradykinin, acting as antagonists to noradrenaline.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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