August 1967
Volume 6, Issue 4
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Articles  |   August 1967
Sodium Ion Transport of the Ciliary Body in Vitro
Author Affiliations
  • MONTE G. HOLLAND
    Department of Ophthalmology, Tulane University School of Medicine, New Orleans, La.
  • MARION STOCKWELL
    Department of Ophthalmology, Tulane University School of Medicine, New Orleans, La.
Investigative Ophthalmology & Visual Science August 1967, Vol.6, 401-409. doi:
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      MONTE G. HOLLAND, MARION STOCKWELL; Sodium Ion Transport of the Ciliary Body in Vitro. Invest. Ophthalmol. Vis. Sci. 1967;6(4):401-409.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Sodium ion influx and outflux were measured simultaneously, with two radioactive isotopes, in the cat ciliary body isolated in vitro. Measurements of membrane potential or short-circuit current were made concurrently with the isotope studies. In the non-short-circuited membrane, where the membrane electromotive force assisted sodium influx, the sodium ion current was two to three times larger than the estimated average short-circuit current, implying the coexistence of an anion transport. In the continuously short-circuited membrane, in which the membrane electromotive force was eliminated, a net sodium ion influx persisted and was approximately equal to the short-circuit current. Thus, the in vitro cat ciliary body membrane appears to function as a mixed sodium-anion pump in the non-short-circuited state, but mainly as a sodium ion pump when short circuited.

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