Intracellular and extracellular chloride ions in the horizontal cells of the stingray retina.
Intracellular and extracellular concentrations of chloride ([Cl-]i, [Cl-]o) ions in the horizontal cells of the stingray retina were studied by means of ion-selective microelectrodes. The electrodes used were of the double-barreled type and Corning's #477315 resin was used as the exchanger. The average [Cl-]o and [Cl-]i in the L-type cells were 320 and 130 mM, respectively (n = 37), and the equilibrium potential (ECl) was calculated as -23.3 mV. In some cases, dark membrane potentials were more positive than the ECl. With white light stimulus, the membrane hyperpolarized to a more negative level than ECl. Based on the experiments described above, the hypothesis that the hyperpolarizing response of horizontal cells is due to the permeability change of the membrane to chloride ion was excluded in the stingray retina.
Fujimoto
M
M
Zoological Institute, Faculty of Science, Hiroshima University, Japan.
Yanase
H
H
Katayama
J
J
Toyoda
J
J
D000818:Animals; D002712:Chlorides / Q000378:metabolism*; D005110:Extracellular Space / Q000378:metabolism; D005399:Fishes / Q000378:metabolism*; D007424:Intracellular Fluid / Q000378:metabolism; D008564:Membrane Potentials; D008839:Microelectrodes; D010775:Photic Stimulation; D012160:Retina / Q000166:cytology / Q000378:metabolism* / Q000528:radiation effects
D002712:Chlorides