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      Comparative Studies of Furosemide Effects on Membrane Potential and Intracellular Chloride Activity in Human and Rabbit Ciliary Epithelium

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          Furosemide (1 m M), a potent loop diuretic, caused a 10-mV (n = 14) depolarization of the intracellular potential difference (PD<sub>I</sub>) of isolated rabbit ciliary epithelium (CE), but produced a 9-mV (n = 5) hyperpolarization of PDI of isolated human CE. In rabbit CE, furosemide consistently depolarized PDi byChloride transport 13, 7 and 8 mV in HCO<sub>3</sub><sup>––</sup>-free Ringer, Na<sup>+</sup>-free Ringer and after BaCl<sub>2</sub> treatment, respectively. The depolarization of PD<sub>I</sub> was reduced to 2 mV (n = 11) in Cl-free conditions. A hyper polarization of PD<sub>I</sub> caused by furosemide that was quantitatively similar to that seen in normal Ringer also occurred in human CE during immersion in HCO<sub>3</sub><sup>––</sup>-free Ringer, Na<sup>+</sup>-free Ringer and after BaCl<sub>2</sub> treatment. There was a small hyperpolarization (3 mV) of PD<sub>I</sub> in Cl<sup>––</sup>-free conditions. Human or rabbit tissue-cultured nonpigmented ciliary epithelial cells were loaded with the Cl<sup>––</sup>-sensitive fluorophore 6-methoxy-N-(3-sul-fopropyl) quinolinium (SPQ) in hypotonic solution (145 mosm) for 4 min at 37°C. Furosemide decreased intracellular Cl<sup>––</sup> fluorescence activity of both human and rabbit ciliary epithelial cells by 30 ± 5 (n = 8) and 25 ± 7% (n = 13), respectively, when the cells were immersed in Ch-rich solution. It is suggested that a furosemide-sensitive Cl<sup>––</sup>- movement exists in both rabbit and human CE, although the mode of Cl<sup>––</sup> movement to the aqueous across CE may differ between these species.

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          Author and article information

          Ophthalmic Res
          Ophthalmic Research
          S. Karger AG
          10 December 2009
          : 24
          : 2
          : 83-91
          Departments of aOphthalmology and bPhysiology and Endocrinology, Medical College of Georgia, Augusta, Ga.; cDepartment of Ophthalmology, Yale University, New Haven, Conn., USA
          267151 Ophthalmic Res 1992;24:83–91
          © 1992 S. Karger AG, Basel

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          Pages: 9
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