Changes in [K+]0 induced by transretinal currents in frog retina.
Current-induced changes in extracellular potassium concentration (delta [K+]0) were measured with K+-selective microelectrodes in frog retina. A characteristic depth profile of delta[K+]0 was detected, which included significant changes in the superfusate just above the inner limiting membrane. This response was almost eliminated by Ba2+, a blocker of K+ channels. The delta[K+]0 in the superfusate is likely due to transcellular flux of K+, probably through Muller cell endfeet.
Karwoski
C J
CJ
Department of Psychology, University of Georgia, Athens.
D000818:Animals; D004558:Electric Stimulation; D005071:Evoked Potentials; D066298:In Vitro Techniques; D008839:Microelectrodes; D011188:Potassium / Q000378:metabolism*; D011894:Rana pipiens; D012016:Reference Values; D012160:Retina / Q000502:physiology*
D011188:Potassium