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Effect of adrenalectomy on calcium metabolism in vitamin D-treated and rachitic rats

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Abstract

The effect of adrenalectomy on radiocalcium distribution in rachitic and vitamin D-treated rats was studied. Adrenalectomy resulted in an increased deposition of radiocalcium in the femurs of both rachitic and vitamin D-treated rats when compared with their respective shamoperated controls. However, kinetic analysis of the data on the skeletal uptake of radiocalcium demonstrated that accretion rates of bone mineral were decreased by adrenalectomy at least in vitamin D-treated animals. Vitamin D administration, on the other, hand increased the accretion rate over that of rachitic controls in both adrenalectomized and non-adrenalectomized animals. In addition vitamin D was shown to enhance intestinal absorption as well as skeletal deposition of radiocalcium in the adrenalectomized rachitic rat.

Résumé

On a étudié l'effet de la suppression des capsules surrénales au point de vue de la distribution du radiocalcium chez des rats rachitiques et chez des rats traités par la vitamine D. Cette opération a produit une augmentation du dépôt de radiocalcium dans les fémurs des rats rachitiques et également des rats traités par la vitamine D comparés à leurs contrôles respectifs ayant eu une opération simulée. Cependant, une analyse kinétique des données sur l'assimilation squelettique du radiocalcium a démontré que les degrés de déposition du minéral de l'os étaient amoindris par la suppression des capsules surrénales du moins chez les animaux traités par la vitamine D. D'autre part, la vitamine D a augmenté le degré de déposition plus que celui des contrôles rachitiques à la fois chez les animaux ayant eu ou non leurs capsules surrénales supprimées. De plus on a démontré que la vitamine D a rehaussé l'absorption intestinale autant que la déposition squelettique du radiocalcium chez le rat rachitique à qui on a enlevé les capsules surrénales.

Zusammenfassung

In dieser Arbeit wurde die Auswirkung der Nebennierenentfernjng auf die Verteilung radioaktivem Calciums in rachitischen und Vitamin D behandelten Ratten untersucht. Entfernung der Nebennieren hatte eine erhöhte Ablagerung von radioaktivem Calcium in den Obserschenkelknochen der rachitischen und mit Vitamin D behandelten Ratten gegenüber den jeweiligen scheinoperierten Kontrollen zur Folge. Jedoch konnte durch kinetische Analyse der Ablagerungswerte von radioaktivem Calcium im Skelet festgestellt werden, daß die Menge der abgelagerten Knochenmineralien durch Entfernung der Nebennieren zumindest bei den mit Vitamin D behandelten Ratten herabgesetzt wurde. Auf der anderen Seite hat die Verabreichung von Titamin D die Ablagerungsmenge bei Ratten, denen die Nebennieren entfernt wurden und in solchen, die nicht operiert wurden, den rachitischen Kontrollen gegenüber erhöht. Zusätzlich konnte gezeigt werden, daß bei rachitischen Ratten nach Nebennierenentfernung und nach Behandlung mit Vitamin D erhöhte Darmabsorption und Skeletablagerung radioaktiven Calciums stattfand.

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These studies were supported by U. S. National Institutes of Health Grants AMO4652 and 2-T01-DE-0090 and by U. S. Atomic Energy Commission Contract AT (30-1)-2147.

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Kallfelz, F.A., Wasserman, R.H. Effect of adrenalectomy on calcium metabolism in vitamin D-treated and rachitic rats. Calc. Tis Res. 3, 74–83 (1969). https://doi.org/10.1007/BF02058647

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  • DOI: https://doi.org/10.1007/BF02058647

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