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Renal proximal tubular buffer-(glycodiazine) transport

Inhomogeneity of local transport rate, dependence on sodium, effect of inhibitors and chronic adaptation

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Summary

Using the stop flow microperfusion technique with simultaneous capillary perfusion the secretory rate of H+ ions in the proximal tubule was evaluated by measuring the level flow reabsorption as well as the static head concentration difference of3H labelled glycodiazine. At ambient glycodiazine concentration of 21 mmol/l the level flow reabsorption is in the same range as that of bicarbonate. In the early proximal loops the reabsorption is 20% greater than in the late proximal loops. The carbonic anhydrase inhibitors acetazolamide and 3,4-methylenedioxyphenyl-sulfonamide (both 10−4 M) as well as furosemide (10−3 M) inhibit the glycodiazine reabsorption 43%, 27% and 22% respectively. Thiocyanate (2 · 10−2 M), however, exerted only an insignificant inhibition (12%). When Na+ in the ambient perfusion solutions was replaced by Li+ or choline+ the glycodiazine transport was strongly reduced. Ouabain (5 · 10−2 M) inhibited too, but amiloride (10−3 M) had no effect on glycodiazine transport.

The glycodiazine transport was 28% reduced in metabolic alkalosis and to a smaller although significant extent (17%) in metabolic acidosis; it was unchanged in chronic hypercapnia. In chronic K+ depletion the glycodiazine reabsorption was accelerated by 12% only in the early proximal loops. Chronic parathyroidectomy as well as acute substitution with parathyroid hormone had no effect on the glycodiazine absorption. The main conclusions are: Proximal H+ transport proceeds with suitable buffers. Although independent of HCO3 − and carbonic anhydrase, it could be partially inhibited by CA inhibitors. H+ transport is supposed to proceed as countertransport with Na+ ions. In chronic alkalosis the H+ transport is reduced.

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Authors and Affiliations

  1. Max-Planck-Institut für Biophysik, Frankfurt a. M., Germany

    K. J. Ullrich, G. Rumrich, K. Baumann, S. Klöss & F. Papavassiliou

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Ullrich, K.J., Rumrich, G., Baumann, K. et al. Renal proximal tubular buffer-(glycodiazine) transport. Pflugers Arch. 357, 149–163 (1975). https://doi.org/10.1007/BF00585971

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