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Zur reagibilität von kortikalen Knochenkapillaren

Funktionelle TEM-Analyse mit Adrenalin, ATP und insulin

Morphological effects of cortical bone capillaries

A functional TEM analysis with epinephrine, ATP and insulin

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Abstract

In order to study any morphological effects that vasoactive drugs might exert on cortical bone capillaries, Swiss mice received one intravenous bolus injection each of epinephrine, ATP and insulin. In one control group saline solution was injected and another was not treated. All animals were handled in the same way. A piece of the tibia diaphysis was resected and prepared for transmission electron microscopy (TEM). The lumina and the endothelia of capillaries were submitted to computerized morphometry. Some significant changes were noted: epinephrine increases both the width of the lumen and the endothelium. ATP decreases the endothelium. Insulin (hypoglycaemia?) thickens the endothelium. These finding suggest some physiological hypotheses: the epinephrine-induced widening of the lumen and the thickening of the endothelium might reflect a decreased extravasal space and oedema of cortical bone that might cause the diffusion of minerals to take longer. Intracortical perfusion pressure would then decrease and the bone perfusion rate increase. ATP might reduce the transcapillary diffusion time and increase the extravasal space in cortical bone. Apparently there are specific insulin receptors in cortical bone capillaries.

Zusammenfassung

Es sollte herausgefunden wurden, ob vasoaktive Pharmaka morphologische Veränderungen in kortikalen Knochenkapillaren machen können. Dazu erhielten Swiss-Mäuse i.v.-Bolusinjektionen von Adrenalin, ATP and Insulin. Eine Kontrollgruppe blieb unbehandelt; einer anderen wurde isotonische Kochsalzlösung injiziert. Alle Tiere wurden in gleicher Weise gehandhabt: Das mittlere Stück der Tibiadiaphyse wurde reseziert and für die TEM aufgearbeitet. Die Lumina and die Endothelien der Kapillaren wurden morphometriert. Dabei fanden sich einige signifikante Unterschiede: Adrenalin vergrößert sowohl die Lumenweite als auch die Endotheldicke. ATP verdünnt das Endothel. Insulin (die Hypoglykämie?) verdickt das Endothel. Diese Befunde begründen einige physiologische Hypothesen: Die Adrenalineffekte könnten eine Verkleinerung des Extravasalraums and ein intraossäres Ödem bedeuten, was die Diffusionszeit von Mineralien verlängerte. Der intrakortikale Perfusionsdruck nähme ab and die Perfusionsrate des Knochens stiege. ATP würde die Diffusionszeit reduzieren and den Extravasalraum vergrößern. Offenbar haben Kapillaren auch im Knochengewebe spezifische Insulinrezeptoren.

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In memoriam Prof. Dr. Werner Lierse, vormals Direktor des Instituts für Neuroanatomie, Universitätskrankenhaus Eppendorf, Hamburg

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Döhler, J.R., Hennig, F.F. & Hughes, S.P.F. Zur reagibilität von kortikalen Knochenkapillaren. Langenbecks Arch Chir 380, 176–183 (1995). https://doi.org/10.1007/BF00207726

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  • DOI: https://doi.org/10.1007/BF00207726

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