Ca(2+) -independent effects of BAPTA and EGTA on single-channel Cl(-) currents in brown adipocytes.
The Cl(-) channels of brown adipocytes electrophysiologically resemble outwardly rectifying Cl(-) channels (ORCC). To study tentative Ca(2+) regulation of these channels, we attempted to control Ca(2+) levels at the cytoplasmic side of the inside-out membrane patches with Ca(2+)-chelating agents. However, we found that the commonly used Ca(2+)-chelators EGTA and BAPTA by themselves influenced the Cl(-) channel currents, unrelated to their calcium chelating effects. Consequently, in this report we delineate effects of Ca(2+)-chelators (acting from the cytoplasmic side) on the single Cl(-) channel currents in patch-clamp experiments. Using fixed (1-2 mM) concentrations of chelators, two types of Cl(-) channels were identified, as discriminated by their reaction to the Ca(2+)-chelators and by their conductance: true-blockage channels (31 pS) and quasi-blockage channels (52 pS). In true-blockage channels, EGTA and BAPTA inhibited channel activity in a classical flickery type manner. In quasi-blockage channels, chelators significantly shortened the duration of individual openings, as in a flickering block, but the overall channel activity tended to increase. This dual effect of mean open time decrease accompanied by a tendency of open probability to increase we termed a quasi-blockage. Despite the complications due to the chelators as such, we could detect a moderate inhibitory effect of Ca(2+). The anionic classical Cl(-) channel blockers DIDS and SITS could mimic the true/quasi blockage of EGTA and BAPTA. It was concluded that at least in this experimental system, standard techniques for Ca(2+) level control in themselves could fundamentally affect the behaviour of Cl(-) channels.
Sabanov
Victor
V
The Wenner-Gren Institute, The Arrhenius Laboratories F3, Stockholm University, SE-106 91, Stockholm, Sweden.
Nedergaard
Jan
J
D017878:4,4'-Diisothiocyanostilbene-2,2'-Disulfonic Acid / Q000494:pharmacology; D012856:4-Acetamido-4'-isothiocyanatostilbene-2,2'-disulfonic Acid / Q000494:pharmacology; D052437:Adipocytes, Brown / Q000378:metabolism*; D000818:Animals; D002118:Calcium / Q000502:physiology*; D002478:Cells, Cultured; D002614:Chelating Agents / Q000494:pharmacology*; D018118:Chloride Channels / Q000502:physiology*; D004533:Egtazic Acid / Q000031:analogs & derivatives* / Q000494:pharmacology*; D051379:Mice
D002614:Chelating Agents; D018118:Chloride Channels; D012856:4-Acetamido-4'-isothiocyanatostilbene-2,2'-disulfonic Acid; D004533:Egtazic Acid; C025603:1,2-bis(2-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid; D017878:4,4'-Diisothiocyanostilbene-2,2'-Disulfonic Acid; D002118:Calcium