1992
DOI: 10.1523/jneurosci.12-11-04243.1992
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Light-evoked expansion of subretinal space volume in the retina of the frog

Abstract: The retina of the frog was superfused with a Ringer solution containing impermeant "probe" cations and anions. Light-evoked concentration changes in these probe ions were measured in the subretinal space (SRS) with ion-selective microelectrodes. A decrease in probe ion concentration was found, and several observations suggest that this is caused by a light-evoked expansion of the SRS. The probe ion decrease was not seen in the isolated retina; thus, the pigment epithelial (PE) cells are important for its gener… Show more

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Cited by 88 publications
(82 citation statements)
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“…Consistent with the [K+]-induced changes in RPE cell volume , Huang & Karwoski (1992) showed in a frog eyecup preparation that light caused a decrease in 'probe' ion concentration in the subretinal space, suggesting a volume increase of 5-9 %. They hypothesized that the subretinal space volume increase was caused by a decrease in the volume of the RPE, perhaps due to the exit of K+ and Cl-through the apical and basolateral membranes, respectively.…”
Section: Solute-induced Volume Changessupporting
confidence: 58%
See 1 more Smart Citation
“…Consistent with the [K+]-induced changes in RPE cell volume , Huang & Karwoski (1992) showed in a frog eyecup preparation that light caused a decrease in 'probe' ion concentration in the subretinal space, suggesting a volume increase of 5-9 %. They hypothesized that the subretinal space volume increase was caused by a decrease in the volume of the RPE, perhaps due to the exit of K+ and Cl-through the apical and basolateral membranes, respectively.…”
Section: Solute-induced Volume Changessupporting
confidence: 58%
“…Light-induced changes in retinal volume have been observed in several preparations from frog, chick and cat (Huang & Karwoski, 1992;Li et al 1992;R. Steinberg, personal communication).…”
Section: Solute-induced Volume Changesmentioning
confidence: 99%
“…Ion-selective microelectrodes (ISM Es) were prepared with a liquid potassium ion exchanger (I E 190, W PI) and calibrated in conventional fashion. In addition to its selectivity for potassium ions, the ion exchanger is highly selective for quaternary ammonium ions (Hansen and Olsen, 1980;Huang and Karwoski, 1992). Changes in extracellular space (EC S) volume can be detected by adding 10 mM TM A-C l to extracellular fluid (Ransom et al, 1985;Huang and Karwoski, 1992).…”
Section: Animalsmentioning
confidence: 99%
“…ISMEs were prepared with a liquid potassium ion exchanger (Corning 477317) and calibrated in conventional fashion. In addition to its selectivity for potassium ions, the ion exchanger is highly selective for quaternary ammonium ions (Hansen and Olsen 1980, Huang and Karwoski 1992a, Huang and Karwoski 1992b. For detection of changes in extracellular space volume, 10mM tetramethylammoniumchloride (TMACl) were added to the extracellular fluid (Ransom et al 1985, Huang andKarwoski 1992b).…”
Section: Ion-selective Microelectrodesmentioning
confidence: 99%
“…Changes in extracellular TMA-concentration can be interpreted as alterations in ECS volume. Relative alterations of ECS volume were calculated using the following expression (Dietzel et al 1980 In the presence of quaternary ammonium ions, the used ISMEs are virtually blind to potassium ions (Huang and Karwoski 1992b). Fig.…”
Section: Ion-selective Microelectrodesmentioning
confidence: 99%