A novel calcium-dependent chloride current in Xenopus oocytes injected with brain messenger RNA.

The Journal of Physiology
B GilloS C Sealfon

Abstract

1. Membrane currents were studied in voltage-clamped Xenopus laevis oocytes which had been injected with total rat brain RNA. 2. When the membrane potential was stepped from -100 to +10 mV, two components of outward current were observed which were named Tout1 and Tout2. 3. Both Tout1 and Tout2 were eliminated in chloride-free or calcium-free media and blocked by 9-anthroic acid, indicating that they represented calcium-dependent chloride currents. 4. Both currents were dependent on extracellular calcium (1.8-10 mM), with Tout1 showing a greater sensitivity to changes in calcium concentration. 5. Tout2 but not Tout1 was blocked by intracellular injection of 300-600 pmol, BaCl2 (final concentration in the oocyte: 0.3-0.6 mM). Injection of KCl had no effect on either Tout1 or Tout2. 6. Tout2 but not Tout1 was enhanced by low concentrations of serotonin (0.5-2 nM). This effect was blocked by 0.1 microM-mianserin. Higher concentrations (above 10 nM) of serotonin decreased the amplitude of Tout2. The effect of serotonin was blocked by the protein kinase inhibitor, H-7 (25 microM). 7. Tout2 but not Tout1 was enhanced by 10 nM-phorbol myristate acetate. Higher concentrations of the phorbol ester decreased the amplitude of Tout2. 8. It...Continue Reading

Citations

Mar 17, 2000·Brain Research. Molecular Brain Research·R D BlitzerE M Landau
Aug 1, 1996·Journal of Photochemistry and Photobiology. B, Biology·B GilloB Minke
Feb 22, 2002·The Journal of Experimental Zoology·Basilio A KotsiasHoracio F Cantiello
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Oct 22, 2016·Journal of Neurophysiology·Lauw J KlaassenMaarten Kamermans
Jun 1, 1991·Pflügers Archiv : European journal of physiology·E HonoréP Guilbault
Feb 1, 1992·Pflügers Archiv : European journal of physiology·P G KostyukA S Ter-Markosyan
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Aug 1, 1991·Molecular and Cellular Endocrinology·R McChesneyC Bancroft

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