[Changes in the concentration of K+ induced by a flash of light in the preretinal vitreous of the anesthesized minipig].
When measured with double-barreled ion-selected microelectrodes, delta K+0 is found to be heterogeneously distributed over the retinal surface. A transient fall (less than or equal to 200 microM) in delta K+0 near an arteriole wall and a transient increase (less than or equal to 500 microM) in zones free of arterioles were observed during light stimulation. In view of these findings the authors assume that the former is due to K+ uptake and transport by perivascular astrocytes, and that the latter is due to K+ siphoning by Müller cells.
Poitry-Yamate
C L
CL
Laboratoire d'Ophtalmologie Expérimentale Genève.
Tsacopoulos
M
M
Pournaras
C J
CJ
D000818:Animals; D001813:Blood-Retinal Barrier / Q000502:physiology*; D002199:Capillary Permeability / Q000502:physiology*; D005110:Extracellular Space / Q000502:physiology*; D010775:Photic Stimulation; D011188:Potassium / Q000097:blood*; D015221:Potassium Channels / Q000502:physiology; D012160:Retina / Q000502:physiology*; D013552:Swine; D013556:Swine, Miniature; D014785:Vision, Ocular / Q000502:physiology*
D015221:Potassium Channels; D011188:Potassium
Changements de la concentration du K+ induits par un flash dans le vitré prérétinien du porc miniature anesthésié.