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. 1995 Jul 15;486(Pt 2):339–347. doi: 10.1113/jphysiol.1995.sp020816

ATP-operated calcium-permeable channels activated via a guanine nucleotide-dependent mechanism in rat macrophages.

A P Naumov 1, K I Kiselyov 1, A G Mamin 1, E V Kaznacheyeva 1, Y A Kuryshev 1, G N Mozhayeva 1
PMCID: PMC1156525  PMID: 7473201

Abstract

1. To elucidate the possible involvement of a G protein in ATP-evoked Ca(2+)-permeable channel activity, membrane currents of rat peritoneal macrophages were recorded using inside-out and cell-attached configurations of the patch clamp technique. 2. In inside-out experiments with a pipette solution containing 105 mM Ba2+, application of 100 microM GTP or GTP gamma S to the internal surface of the membrane elicited a rise in channel activity. This effect was observed in 49% of the patches investigated (n = 69). The mean value of NPo (N, number of open channels; Po, channel open probability) was equal to 0.49 +/- 0.27 (mean +/- S.E.M.; n = 16). The delay in the activity development was 21 +/- 8 s (n = 18) with 200 microM ATP added to the pipette solution and about 4 min (n = 5) without agonist in the pipette. Similar results were obtained with 10 mM Ca2+ as the only permeant cation. 3. Properties of GTP gamma S-evoked channels were identical to those of channels activated by extracellular application of ATP. The channels exhibited at least four conductance sublevels, the 4th one being the least frequent. With 105 mM Ba2+ as a permeant cation, sublevel conductances were 3.5, 7, 10 and 15 pS. Corresponding values for 10 mM Ca2+ were about 4, 9, 13 and 17 pS. Extrapolated reversal potential (Er) values were about +40 and +25 mV for Ba2+ and Ca2+, respectively. 4. The activity of channels with similar characteristics could be induced by the extracellular application of fluoride in cell-attached experiments without any agonist in the pipette solution.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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