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Literature DB >> 7260265

Intracellular Na+ activity as a function of Na+ transport rate across a tight epithelium.

Abstract

Liquid Na+ resin microelectrodes were used to measure intracellular Na+ activities (alpha iNa+) in the mammalian tight epithelium, rabbit urinary bladder. alpha iNa+ averaged 7 +/- 1 mM and was independent of Na+ transport rate over the range of 2 to 8 muA/muF. (1 mF congruent to 1 cm2 apical membrane area). After Na+ loading the cells the Na+ pump in the basolateral membrane was measurably electrogenic. A method for shielding the Na+-sensitive microelectrodes is described which increases the response time and eliminates an electrical shunting artifact.

Entities: Species

Mesh：

Substances：
Sodium

Year: 1980 PMID： 7260265 PMCID： PMC1328722 DOI： 10.1016/S0006-3495(80)85086-7

Source DB: PubMed Journal: Biophys J ISSN： 0006-3495 Impact factor: 4.033

4 in total

1. The mechanism of Na+ transport by rabbit urinary bladder.

Authors: S A Lewis; D C Eaton; J M Diamond
Journal: J Membr Biol Date: 1976-08-27 Impact factor: 1.843

2. Na+ transport by rabbit urinary bladder, a tight epithelium.

Authors: S A Lewis; J M Diamond
Journal: J Membr Biol Date: 1976-08-27 Impact factor: 1.843

3. Basolateral membrane potential of a tight epithelium: ionic diffusion and electrogenic pumps.

Authors: S A Lewis; N K Wills; D C Eaton
Journal: J Membr Biol Date: 1978-06-28 Impact factor: 1.843

4. Sodium-selective liquid ion-exchanger microelectrodes for intracellular measurements.

Authors: J O'Doherty; J F Garcia-Diaz; W M Armstrong
Journal: Science Date: 1979-03-30 Impact factor: 47.728

4 in total

26 in total

7. Effects of intracellular sodium and potassium iontophoresis on membrane potentials and resistances in toad urinary bladder.

Authors: J Narvarte; A L Finn
Journal: J Membr Biol Date: 1985 Impact factor: 1.843

Intracellular Na+ activity as a function of Na+ transport rate across a tight epithelium.

1. The mechanism of Na+ transport by rabbit urinary bladder.

2. Na+ transport by rabbit urinary bladder, a tight epithelium.

3. Basolateral membrane potential of a tight epithelium: ionic diffusion and electrogenic pumps.

4. Sodium-selective liquid ion-exchanger microelectrodes for intracellular measurements.

1. Influence of apical Na+ entry on Na(+)-K(+)-ATPase in amphibian distal nephron cells in culture.

2. Apical and basolateral membrane ionic channels in rabbit urinary bladder epithelium.

3. Apical membrane potassium and chloride permeabilities in surface cells of rabbit descending colon epithelium.

4. Differential effects of aldosterone and ADH on intracellular electrolytes in the toad urinary bladder epithelium.

5. Ion transport and electrophysiology of the early proximal colon of rabbit.

6. Sodium pump quantity and turnover in rabbit descending colon at different rates of sodium absorption.

7. Effects of intracellular sodium and potassium iontophoresis on membrane potentials and resistances in toad urinary bladder.

8. Intracellular ion activities in frog skin in relation to external sodium and effects of amiloride and/or ouabain.

9. Cell Na+ activities and transcellular Na+ absorption by descending colon from normal and Na+-deprived rabbits.

10. Urinary proteases degrade epithelial sodium channels.