Tubular transport and urinary excretion of phosphate after renal denervation in the anesthetized rat

G. Szenasi, P. Bencsath, E. Lehoczky, L. Takacs

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Abstract

Tubular transport of phosphate (Pi) was studied using clearance and tracer microinjection techniques in Inactin-anesthetized male rats subjected to left kidney denervation. Experiments were conducted in the following groups: (1) acute denervation (AD); (2) chronic denervation (CD); (3) acute denervation plus thyroparathyroidectomy (AD + TPTX); (4) microinjection with AD. Besides a marked diuresis and natriuresis with no difference in GFR between innervated (inn) and denervated (den) kidneys, unilateral renal denervation resulted in an increased urinary excretion and decreased tubular reabsorption of inorganic phosphate. Maximum tubular reabsorption of Pi [Tm(Pi)] calculated per unit GFR was (means ± SE): AD, inn: 2.38 ± 0.04, den: 1.98 ± 0.06 μmol/ml; CD, inn: 2.66 ± 0.10, den: 2.19 ± 0.11 μmol/ml; AD + TPTX, inn: 4.78 ± 0.06, den: 4.26 ± 0.08 μmol/ml. Thus, differences in Tm(pi) between the two sides were of the same magnitude in the three groups. Fractional recovery of 32Pi from microinjections in control (C) and post-denervation (D) periods was: early proximal, C: 53.0 ± 0.81, D: 61.3 ± 1.07%; late proximal, C: 77.0 ± 0.81, D: 70.6 ± 0.60%; early distal, C: 93.7 ± 0.75, D: 93.5 ± 0.72%. It is concluded that renal sympathectomy depresses tubular transport of inorganic phosphate in anesthetized rats by a primary action on the proximal convoluted tubule and with a partial compensation in the loop of Henle.

Original languageEnglish
Pages (from-to)F481-F486
JournalAmerican Journal of Physiology - Renal Fluid and Electrolyte Physiology
Volume9
Issue number6
Publication statusPublished - Jan 1 1981

ASJC Scopus subject areas

  • Physiology

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