dc.contributor.author |
Braun, Gabriella |
|
dc.contributor.author |
Lengyel, Miklós |
|
dc.contributor.author |
Enyedi, Péter |
|
dc.contributor.author |
Czirják, Gábor |
|
dc.date.accessioned |
2017-06-09T10:08:11Z |
|
dc.date.available |
2017-06-09T10:08:11Z |
|
dc.date.issued |
2015 |
|
dc.identifier |
84924957228 |
|
dc.identifier.citation |
pagination=1728-1738;
journalVolume=172;
journalIssueNumber=7;
journalTitle=BRITISH JOURNAL OF PHARMACOLOGY; |
|
dc.identifier.uri |
http://repo.lib.semmelweis.hu//handle/123456789/2705 |
|
dc.identifier.uri |
doi:10.1111/bph.13019 |
|
dc.description.abstract |
BACKGROUND AND PURPOSE: Pharmacological separation of the background potassium currents of closely related K2P channels is a challenging problem. We previously demonstrated that ruthenium red (RR) inhibits TASK-3 (K2 P 9.1), but not TASK-1 (K2 P 3.1) channels. RR has been extensively used to distinguish between TASK currents in native cells. In the present study, we systematically investigate the RR sensitivity of a more comprehensive set of K2 P channels. EXPERIMENTAL APPROACH: K+ currents were measured by two-electrode voltage clamp in Xenopus oocytes and by whole-cell patch clamp in mouse dorsal root ganglion (DRG) neurons. KEY RESULTS: RR differentiates between two closely related members of the TREK subfamily. TREK-2 (K2 P 10.1) proved to be highly sensitive to RR (IC50 = 0.2 muM), whereas TREK-1 (K2 P 2.1) was not affected by the compound. We identified aspartate 135 (D135) as the target of the inhibitor in mouse TREK-2c. D135 lines the wall of the extracellular ion pathway (EIP), a tunnel structure through the extracellular cap characteristic for K2 P channels. TREK-1 contains isoleucine in the corresponding position. The mutation of this isoleucine (I110D) rendered TREK-1 sensitive to RR. The third member of the TREK subfamily, TRAAK (K2 P 4.1) was more potently inhibited by ruthenium violet, a contaminant in some RR preparations, than by RR. DRG neurons predominantly express TREK-2 and RR-resistant TREK-1 and TRESK (K2 P 18.1) background K+ channels. We detected the RR-sensitive leak K+ current component in DRG neurons. CONCLUSIONS AND IMPLICATIONS: We propose that RR may be useful for distinguishing TREK-2 (K2P 10.1) from TREK-1 (K2P 2.1) and other RR-resistant K2 P channels in native cells. |
|
dc.relation.ispartof |
urn:issn:0007-1188 |
|
dc.title |
Differential sensitivity of TREK-1, TREK-2 and TRAAK background potassium channels to the polycationic dye ruthenium red |
|
dc.type |
Journal Article |
|
dc.date.updated |
2015-11-25T10:03:54Z |
|
dc.language.rfc3066 |
en |
|
dc.identifier.mtmt |
2812479 |
|
dc.identifier.wos |
000351398000008 |
|
dc.identifier.pubmed |
25409575 |
|
dc.contributor.department |
SE/AOK/I/Élettani Intézet |
|
dc.contributor.institution |
Semmelweis Egyetem |
|