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Original Articles

Sodium transport kinetics in erythrocytes from spontaneously hypertensive rats.

C Rosati, P Meyer, R Garay
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https://doi.org/10.1161/01.HYP.11.1.41
Hypertension. 1988;11:41-48
Originally published January 1, 1988
C Rosati
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P Meyer
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R Garay
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Abstract

Rat erythrocytes with five different amounts of Na+ content have been prepared by using a new, nondetrimental Na+-loading method (net NaHPO4-influx through the anion carrier). This method allowed the determination of 1) maximal translocation rates and apparent dissociation constants for internal Na+ of the Na+-K+ pump, outward Na+-K+ cotransport, and Na+-Li+ countertransport and 2) rate constants of Na+ leak in erythrocytes from spontaneously hypertensive rats of the Okamoto strain and Wistar-Kyoto normotensive controls aged 2 to 26 weeks. Two major abnormalities were found in erythrocytes from spontaneously hypertensive rats: 1) a decreased cotransport affinity for internal Na+, which was constantly observed from 2 to 26 weeks of age (mean intracellular Na+ content for half-maximal stimulation of outward Na+-K+ cotransport = 33.1 +/- 7.0 [SD] mmol/L cells in spontaneously hypertensive rats vs 16.7 +/- 4.7 mmol/L cells in Wistar-Kyoto rats; p less than 0.001), and 2) a decreased maximal pump rate in adult (15- to 26-week-old) spontaneously hypertensive as compared with that for age-matched Wistar-Kyoto rats (9-37 vs 34-70 mmol/L cells/hr). Therefore, the low cotransport affinity for internal Na+ appears to be a stable, possibly genetic defect of spontaneously hypertensive rats. Conversely, the decreased maximal pump rate may be a secondary event, possibly reflecting the appearance of endogenous pump inhibitors in the plasma of adult spontaneously hypertensive rats.

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January 1988, Volume 11, Issue 1
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    Sodium transport kinetics in erythrocytes from spontaneously hypertensive rats.
    C Rosati, P Meyer and R Garay
    Hypertension. 1988;11:41-48, originally published January 1, 1988
    https://doi.org/10.1161/01.HYP.11.1.41

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    Sodium transport kinetics in erythrocytes from spontaneously hypertensive rats.
    C Rosati, P Meyer and R Garay
    Hypertension. 1988;11:41-48, originally published January 1, 1988
    https://doi.org/10.1161/01.HYP.11.1.41
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