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Research Article Free access | 10.1172/JCI107583

Proximal tubule reabsorption after hyperoncotic albumin infusion. Role of parathyroid hormone and dissociation from plasma volume.

F G Knox, E G Schneider, L R Willis, J W Strandhoy, C E Ott, J L Cuche, R S Goldsmith, and C D Arnaud

Nephrology Research Laboratory, Department of Physiology, and Mineral Research Laboratory, Department of Endocrine Research and Clinical Study Unit, Mayo Clinic and Mayo Foundation, Rochester, Minnesota 55901, USA.

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Nephrology Research Laboratory, Department of Physiology, and Mineral Research Laboratory, Department of Endocrine Research and Clinical Study Unit, Mayo Clinic and Mayo Foundation, Rochester, Minnesota 55901, USA.

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Nephrology Research Laboratory, Department of Physiology, and Mineral Research Laboratory, Department of Endocrine Research and Clinical Study Unit, Mayo Clinic and Mayo Foundation, Rochester, Minnesota 55901, USA.

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Nephrology Research Laboratory, Department of Physiology, and Mineral Research Laboratory, Department of Endocrine Research and Clinical Study Unit, Mayo Clinic and Mayo Foundation, Rochester, Minnesota 55901, USA.

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Nephrology Research Laboratory, Department of Physiology, and Mineral Research Laboratory, Department of Endocrine Research and Clinical Study Unit, Mayo Clinic and Mayo Foundation, Rochester, Minnesota 55901, USA.

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Nephrology Research Laboratory, Department of Physiology, and Mineral Research Laboratory, Department of Endocrine Research and Clinical Study Unit, Mayo Clinic and Mayo Foundation, Rochester, Minnesota 55901, USA.

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Nephrology Research Laboratory, Department of Physiology, and Mineral Research Laboratory, Department of Endocrine Research and Clinical Study Unit, Mayo Clinic and Mayo Foundation, Rochester, Minnesota 55901, USA.

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Nephrology Research Laboratory, Department of Physiology, and Mineral Research Laboratory, Department of Endocrine Research and Clinical Study Unit, Mayo Clinic and Mayo Foundation, Rochester, Minnesota 55901, USA.

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Published February 1, 1974 - More info

Published in Volume 53, Issue 2 on February 1, 1974
J Clin Invest. 1974;53(2):501–507. https://doi.org/10.1172/JCI107583.
© 1974 The American Society for Clinical Investigation
Published February 1, 1974 - Version history
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Abstract

Preferential expansion of the plasma volume by infusion of salt-poor hyperoncotic albumin solution decreases sodium reabsorption by the proximal tubule. The present micropuncture studies test the thesis that albumin infusion depresses proximal reabsorption by an effect unrelated to expansion of the plasma volume, perhaps due to an effect of parathyroid hormone (PTH) on proximal sodium reabsorption. Infusion of salt-poor hyperoncotic albumin significantly decreased plasma ionized calcium, increased immunoreactive PTH (iPTH) in plasma, decreased sodium reabsorption by the proximal tubule, and increased phosphate clearance. In contrast, infusions of albumin, in which the ionized calcium was restored to normal plasma levels, had no significant effect on ionized calcium, iPTH, proximal reabsorption, or phosphate clearance in intact dogs. Similarly, in parathyroidectomized animals given a constant replacement infusion of PTH, albumin infusion had no significant effect on proximal reabsorption or phosphate clearance. Plasma volume was markedly expanded following albumin infusion in all groups of dogs. These findings (a) indicate that PTH plays a significant role in the decrease in sodium reabsorption by the renal proximal tubule after salt-poor hyperoncotic albumin infusion, and (b) dissociate preferential expansion of the plasma volume from decreases in sodium reabsorption by the proximal tubule.

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