| First Author | Sabanov V | Year | 2007 |
| Journal | Biochim Biophys Acta | Volume | 1768 |
| Issue | 11 | Pages | 2714-25 |
| PubMed ID | 17716619 | Mgi Jnum | J:130681 |
| Mgi Id | MGI:3772118 | Doi | 10.1016/j.bbamem.2007.07.003 |
| Citation | Sabanov V, et al. (2007) Ca(2+) -independent effects of BAPTA and EGTA on single-channel Cl(-) currents in brown adipocytes. Biochim Biophys Acta 1768(11):2714-25 |
| abstractText | 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. |
