scholarly journals Energy barriers to sodium extrusion from sodium-rich kidney cortex slices

1966 ◽  
Vol 187 (2) ◽  
pp. 361-368 ◽  
Author(s):  
Honor Smyth
Keyword(s):  
Kidney Cortex ◽  
Energy Barriers ◽  
Cortex Slices ◽  
Sodium Extrusion ◽  
Kidney Cortex Slices

scholarly journals Sodium Extrusion and Potassium Uptake in Guinea Pig Kidney Cortex Slices

1965 ◽  
Vol 48 (4) ◽  
pp. 699-717 ◽  
Author(s):  
Guillermo Whittembury
Keyword(s):  
Guinea Pig ◽  
Potential Gradient ◽  
Electrochemical Potential ◽  
Kidney Cortex ◽  
K Uptake ◽  
Pig Kidney ◽  
Cortex Slices ◽  
Sodium Extrusion ◽  
Kidney Cortex Slices ◽  
Bathing Fluid

Slices from the cortex corticis of the guinea pig kidney were immersed in a chilled solution without K and then reimmersed in warmer solutions. The Na and K concentrations and the membrane potential Vm were then studied as a function of the Na and K concentrations of the reimmersion fluid. It was found that Na is extruded from the cells against a large electrochemical potential gradient. Q10 for net Na outflux was ∼2.5. At bath K concentrations larger than 8 mM the behavior of K was largely passive. At the outset of reimmersion (Vm > EK) K influx seemed secondary to Na extrusion. Na extrusion would promote K entrance, being limited and requiring the presence of K in the bathing fluid. At bath K concentrations below 8 mM, K influx was up an electrochemical potential gradient. Thus a parallel active K uptake is apparent. Q10 for net K influx was ∼2.0. Dinitrophenol inhibited net Na outflux and net K influx, Q10 became <1.1 for both fluxes. The ratio between these fluxes varied. Thus at the outset of reimmersion the net Na outflux to net K influx ratio was >1. After 8 minutes it was <1.

Sign in / Sign up

Export Citation Format

Share Document