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. 1984 Jul;352:517–526. doi: 10.1113/jphysiol.1984.sp015307

Natriuretic response of the rat to plasma concentrations of arginine vasopressin within the physiological range.

R J Balment, M J Brimble, M L Forsling, C T Musabayane
PMCID: PMC1193227  PMID: 6747899

Abstract

The relationship of plasma vasopressin concentrations in the physiological range to renal electrolyte excretion was investigated. Unanaesthetized rats, when normally hydrated, were found to have a plasma vasopressin concentration of 1.13 +/- 0.15 mu u./ml. 16 h water deprivation raised this to 1.98 +/- 0.21 mu u./ml. Inactin-anaesthetized rats infused with 0.45% NaCl had a plasma vasopressin concentration of 1.19 +/- 0.18 mu u./ml. Administration of synthetic arginine vasopressin at 6 and 24 mu u./min raised plasma vasopressin levels to 1.88 +/- 0.17 and 4.26 +/- 0.43 microunits./ml respectively. In addition to the expected antidiuresis, vasopressin at a rate of 6 microunits./min also produced a highly significant increase in Na+ excretion from 8.9 +/- 0.6 to 10.5 +/- 0.6 mumol/min and Cl- excretion from 9.1 +/- 0.7 to 10.5 +/- 0.7 mumol/min. At 24 microunits./min it produced larger increases in Na+ and Cl- excretion. Inactin-anaesthetized hypophysectomized rats infused with 0.45% NaCl had a plasma vasopressin concentration of only 0.17 +/- 0.04 microunits./ml. Administration of vasopressin at 6 and 24 microunits./ml raised plasma vasopressin levels in these animals to 0.63 +/- 0.17 and 2.20 +/- 0.11 microunits./ml respectively. Hypophysectomized rats failed to exhibit a natriuresis in response to the lower dose of vasopressin, despite exhibiting an undiminished antidiuresis. The failure of the natriuresis may be related to the lower plasma vasopressin concentration achieved. It is concluded that in the rat plasma vasopressin concentrations within the physiological range do influence Na+ and Cl- excretion by the kidney as well as controlling urine flow rate.

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Selected References

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