| 2003 |
KCNT2/Slick is a Na+-activated K+ channel that is activated by intracellular Na+ and Cl-, and inhibited by intracellular ATP. A consensus ATP binding site near the C terminus is required for ATP and its nonhydrolyzable analogs to reduce open probability. |
Heterologous expression, electrophysiology (patch-clamp), site-directed mutagenesis of ATP binding site |
The Journal of neuroscience |
High |
14684870
|
| 2003 |
KCNT2/Slick channel activation is rapidly gating and the channel integrates intracellular Na+, Cl-, and ATP as indicators of metabolic state to regulate electrical excitability. |
Heterologous expression, whole-cell and single-channel electrophysiology in Xenopus oocytes and mammalian cells |
The Journal of neuroscience |
High |
14684870
|
| 2005 |
Slick (KCNT2) protein is widely distributed in the rat CNS, including brainstem auditory neurons, olfactory bulb, hippocampal CA1-CA3 and dentate gyrus, cortical layers II/III/V, hypothalamus and thalamus, with a distribution overlapping but distinct from Slack. Computer simulations indicate Slick currents can cause adaptation during prolonged stimuli. |
In situ hybridization, immunohistochemistry, computational simulation |
The Journal of comparative neurology |
Medium |
15717307
|
| 2006 |
KCNT2/Slo2.1 activity is strongly inhibited by Gαq-protein coupled receptor (GqPCR) stimulation (M1 muscarinic receptor and mGluR1), in contrast to Slo2.2 (Slack) which is activated. The inhibition involves PKC; PMA application inhibits Slo2.1 whole-cell currents. The distal carboxyl region of Slo2.1 controls sensitivity to PMA. |
Heterologous co-expression in Xenopus oocytes, pharmacological activation of GqPCRs, PMA application, chimera construction, immunocytochemistry |
The Journal of neuroscience |
High |
16687497
|
| 2007 |
Slo2.1 (KCNT2) is expressed in striatal cholinergic interneurons and functions as a Cl--activated K+ channel that is inhibited by mGluR1/5 receptor activation. Under conditions of elevated intracellular NaCl, Slo2.1 provides a background K+ current that is inhibited by mGluR agonists and volatile anesthetics. |
Electrophysiological recordings in brain slices, HEK293 cell transfection reconstitution, immunohistochemistry, in situ hybridization, gramicidin perforated-patch recordings |
The Journal of neuroscience |
High |
17699666
|
| 2008 |
Slack and Slick KNa channels are required for the depolarizing afterpotential (DAP) in medium diameter rat DRG neurons. Native KNa channels show 201 pS unitary conductance, are activated by cytoplasmic Na+ (EC50 ~35 mM) and by Cl-, and both Slack and Slick mRNA are expressed in DRG neurons. |
Inside-out and whole-cell patch-clamp, RT-PCR, pharmacology (TTX) |
Acta pharmacologica Sinica |
Medium |
18664322
|
| 2009 |
Slick (KCNT2) and Slack subunits co-assemble to form heteromeric KNa channels with properties distinct from homomers: different unitary conductance, altered kinetics, different subcellular localization, and different response to PKC activation. Heteromer formation requires the N-terminal domain of Slack-B, which also facilitates trafficking of heteromeric channels to the plasma membrane. |
Co-immunoprecipitation, single-channel electrophysiology, immunocytochemistry, domain deletion/mutation analysis |
The Journal of neuroscience |
High |
19403831
|
| 2010 |
Slo2.1 (KCNT2) channel gating can be activated by fenamates (niflumic acid, flufenamic acid) independent of intracellular Na+. Channel gating is modulated by extracellular K+ and Na+ concentrations. The weak voltage dependence of Slo2.1 is independent of charged residues in S1-S4 segments; mutation of R190 in the S4-S5 linker to Ala/Gln/Glu induces constitutive channel activity. |
Heterologous expression in Xenopus oocytes, voltage-clamp electrophysiology, site-directed mutagenesis |
The Journal of general physiology |
High |
20176855
|
| 2012 |
Slick and Slack channels are regulated by the phosphoinositide PIP2. Exogenous PIP2 activates both channels. The activating effect of PIP2 on Slick involves direct interaction with lysine 306 in the proximal C-terminus. |
Xenopus oocyte expression, voltage-clamp electrophysiology, site-directed mutagenesis (K306 in Slick) |
Biochemical and biophysical research communications |
Medium |
22728883
|
| 2012 |
Fenamates activate Slo2.1 (KCNT2) via two distinct sites: an extracellular accessible site mediating activation and a cytoplasmic accessible site in the pore (S6 segment) mediating inhibition. N-phenylanthranilic acid is the minimal pharmacophore for fenamate activation. Mutation A278R in the pore-lining S6 segment increases sensitivity to NFA activation and reduces inhibition. |
Xenopus oocyte expression, voltage-clamp electrophysiology, site-directed mutagenesis, structure-activity relationship analysis |
Molecular pharmacology |
Medium |
22851714
|
| 2013 |
The activation gate of Slo2.1 (KCNT2) is located at the selectivity filter, not the S6 bundle crossing. Pro271 and Glu275 in S6 maintain the inner pore in an open configuration. Dynamic coupling between the pore helix residue Phe240 and S5/S6 segments mediates channel activation. Verapamil blocks Slo2.1 in an activation-independent manner confirming the S6 bundle crossing does not gate ion access. |
Heterologous expression in Xenopus oocytes, Ala scanning mutagenesis of S6 and S5, intragenic second-site rescue mutations, homology modeling, pharmacological analysis |
The Journal of general physiology |
High |
24166878
|
| 2014 |
Intracellular ATP does NOT inhibit Slo2.1 (KCNT2) channels. Direct application of 5 mM ATP to inside-out patches did not inhibit NFA-activated Slo2.1 currents; metabolic depletion of ATP did not increase Slo2.1 currents; mutation of the C-terminal ATP binding site did not enhance current magnitude. |
Excised inside-out macropatch recordings, whole-cell voltage clamp in HEK293 cells, site-directed mutagenesis of ATP binding site, metabolic inhibition with NaN3 |
Physiological reports |
High |
25214519
|
| 2014 |
Slick (Slo2.1/KCNT2) channels, but not Slack (Slo2.2) channels, are regulated by cell volume changes: Slick is stimulated ~196% by cell swelling and inhibited ~57% by cell shrinkage. This volume sensitivity does not depend on an intact actin cytoskeleton, ATP release, or vesicle fusion. |
Co-expression with aquaporin 1 in Xenopus oocytes, two-electrode voltage clamp, hypo/hypertonic challenge, pharmacological dissection |
PloS one |
Medium |
25347289
|
| 2015 |
The intracellular Na+ sensor of Slo2.1 (KCNT2) is identified as Asp757 in the C-terminus. D757R mutation abolishes Na+ sensitivity while preserving fenamate activation, demonstrating this single Asp residue accounts for intracellular Na+ sensitivity. Fenamates are ~14-fold more potent activators of Slo2.1 than intracellular Na+. |
Site-directed mutagenesis, heterologous expression in Xenopus oocytes and HEK293 cells, whole-cell voltage clamp, excised inside-out macropatch recordings |
The Journal of biological chemistry |
High |
25903137
|
| 2015 |
KCNT2/Slick channel expression is transcriptionally regulated by NF-κB. Two NF-κB binding sites in the KCNT2/Kcnt2 promoter are required for transcriptional activation. NFκB binding was confirmed in vivo by ChIP in neurons. Under hypoxic conditions, NF-κB drives SLICK expression, and NF-κB inhibition reduces Slick transcript levels in primary neurons. |
ChIP assay, luciferase reporter assay, promoter mutagenesis, hypoxia exposure of PC-12 cells, primary neuron cultures with NF-κB inhibitor |
The Journal of biological chemistry |
High |
26100633
|
| 2015 |
Hydrophobic interactions between residues on a single face of the S5 transmembrane segment and Phe240 in the pore helix stabilize Slo2.1 (KCNT2) channels in the closed state. Ala substitution of five S5 residues induces constitutive activity. Mutation of Leu209 (predicted to face Phe240) to Glu or Gln induces maximal activation. |
Ala-scanning mutagenesis of S5, additional point mutagenesis, heterologous expression in Xenopus oocytes, voltage-clamp electrophysiology |
Biochimica et biophysica acta |
Medium |
26724206
|
| 2015 |
In mouse brain, Slick (KCNT2) channels show intense immunoreactivity in processes, varicosities, and neuronal cell bodies of olfactory bulb, hippocampus, amygdala, lateral septal nuclei, hypothalamic and midbrain nuclei, and brainstem; distinct from Slack's primarily diffuse pattern. Both channels overlap in some regions but diverge in others. |
In situ hybridization, immunohistochemistry in mouse brain sections |
The Journal of comparative neurology |
Medium |
26587966
|
| 2015 |
Slick (KCNT2) and Slack (KCNT1) channels co-assemble into identical cellular complexes in mouse brain. Novel interaction partners of native Slick channel complexes identified by co-immunoprecipitation and mass spectrometry include: beta-synuclein, transmembrane protein 263 (TMEM263), inactive dipeptidyl-peptidase (DPP10), and synapse associated protein 102 (SAP102). |
Co-immunoprecipitation, Western blot, double immunofluorescence, mass spectrometric sequencing |
Biochemistry and biophysics reports |
Medium |
29124216
|
| 2016 |
Slo2.1 (KCNT2/Slick) is required for volatile anesthetic (VA)-stimulated K+ transport in cardiac cells and for anesthetic preconditioning (APC)-induced cardioprotection. In Slo2.1 knockout hearts, APC protection against ischemia-reperfusion injury was absent, while Slo2.2 knockout hearts responded like wild-type. VA-stimulated K+ transport in cardiomyocytes and mitochondria from Slo2.1 KO mice was also absent. |
Perfused heart ischemia-reperfusion model, fluorescent K+ flux assay, Slo2.1 KO mice, Slo2.2 KO mice, double KO mice |
Anesthesiology |
High |
26845140
|
| 2017 |
The de novo KCNT2 variant Phe240Leu causes altered ion selectivity: Cl- sensitivity is reversed, predominantly K+-selective WT channels are made to favor Na+ over K+, and inward conductance is increased. Expression of rSlick in primary neurons induced membrane hyperexcitability resembling a cellular seizure phenotype. |
Exome sequencing, Sanger sequencing, whole-cell patch-clamp electrophysiology in heterologous expression system, primary neuron recordings |
Cell reports |
High |
29069600
|
| 2017 |
Slick (KCNT2) channels are exclusively expressed in small- and medium-sized CGRP-containing DRG neurons. A pool of Slick channels localizes to large dense-core vesicles (LDCV) containing CGRP, and upon stimulation for CGRP release, Slick channels translocate from LDCVs to the neuronal membrane. Slick KO mice show increased basal heat detection and exacerbated thermal hyperalgesia; DRG neurons from Slick KO show reduced outward current and altered action potential properties. |
Immunohistochemistry, subcellular fractionation/colocalization, behavioral testing (Slick KO mice), whole-cell patch-clamp of DRG neurons |
Journal of experimental neuroscience |
Medium |
28943756
|
| 2017 |
TNF-α inhibits the SLICK KNa current in rat dorsal horn neurons via the p38 MAPK pathway. The p38 inhibitor SB202190 blocks this effect. TNF-α modulation of SLICK does not affect channel gating directly but likely involves posttranslational modification. |
Cultured dorsal horn neurons, whole-cell patch-clamp, pharmacological inhibition of p38 MAPK |
Journal of pain research |
Medium |
28579824
|
| 2017 |
Heteromeric Slick/Slack K+ channels show graded cell volume sensitivity dependent on the number of Slick α-subunits in the tetrameric channel. Channels with more Slick subunits show greater volume sensitivity, while channels with more Slack subunits show reduced sensitivity. |
Co-expression of varying ratios of Slick/Slack subunits with aquaporin 1 in Xenopus oocytes, two-electrode voltage clamp, osmotic challenge |
PloS one |
Medium |
28222129
|
| 2018 |
SLO2.1 (KCNT2) is expressed and active at the resting membrane potential in myometrial smooth muscle cells (MSMCs). Oxytocin inhibits SLO2.1 via Gαq-protein coupled receptor activation of protein kinase C, leading to membrane depolarization, activation of voltage-dependent calcium channels, and calcium influx. |
Electrophysiological recordings in MSMCs, pharmacological dissection (oxytocin receptor, PKC inhibitors), calcium imaging |
The Journal of physiology |
High |
30334255
|
| 2020 |
Two truncating KCNT2 mutations (frameshift p.L48Qfs43 in N-terminal domain; nonsense p.K564* in C-terminal region) significantly decrease global current density of heteromeric KNa1.1/KNa1.2 channels by ~55% and ~25% respectively, demonstrating loss-of-function effects on heteromeric channels in EOEE patients. |
Whole-cell patch-clamp in transfected CHO cells, homomeric and heteromeric channel reconstitution |
Frontiers in cellular neuroscience |
Medium |
32038177
|
| 2021 |
SLO2.1 (KCNT2) and NALCN form a functionally coupled system in myometrial smooth muscle cells: Na+ entering through NALCN activates SLO2.1, and K+ efflux through SLO2.1 hyperpolarizes the membrane. NALCN and SLO2.1 are in close proximity in human MSMCs. Decreased SLO2.1/NALCN activity leads to membrane depolarization, Ca2+ entry via voltage-dependent channels, and contraction. |
Live-cell imaging, proximity assay (co-localization), electrophysiology, Ca2+ imaging, functional coupling assays in MSMCs |
iScience |
Medium |
34746693
|
| 2022 |
Slick (KCNT2) in nociceptive Aδ-fibers modulates heat-induced pain, while Slick in spinal cord dorsal horn interneurons inhibits capsaicin-induced pain but facilitates somatostatin-induced itch. Slick co-localizes with SSTR2 in spinal dorsal horn. Conditional KO of Slick in Lbx1+ spinal neurons (Lbx1-Slick-/-) increased capsaicin-induced pain and reduced octreotide-induced scratching. |
Immunostaining, in situ hybridization, Western blot, qRT-PCR, global and conditional (Lbx1-Cre) Slick KO mice, behavioral testing, ERK phosphorylation assay |
Anesthesiology |
High |
35303056
|
| 2023 |
Among 14 KCNT2 variants tested in HEK-293 and SH-SY5Y cells, 8 show gain-of-function and 6 show loss-of-function effects by whole-cell electrophysiology. Quinidine and fluoxetine block all GoF variants; loxapine and riluzole activate some LoF variants while blocking others, revealing variant-specific pharmacological profiles. |
Whole-cell electrophysiology in HEK-293 and SH-SY5Y cells, pharmacological profiling of 14 variants |
Annals of neurology |
High |
37062836
|
| 2024 |
Slick (KCNT2) limits TRPM3-mediated noxious heat sensation in sensory neurons. Slick is highly co-expressed with TRPM3 (but not TRPV1, TRPA1, or TRPM2) in sensory neurons. Conditional KO of Slick in Nav1.8+ sensory neurons increases nocifensive behavior to heat and to the TRPM3 activator pregnenolone sulfate. TRPM3 activation increases Na+-dependent outward K+ current, which is absent when NaCl is replaced with choline chloride, indicating Na+ entry through TRPM3 activates Slick. |
Conditional KO mice (SNS-Slick-/-), behavioral testing, in situ hybridization, patch-clamp recordings in sensory neurons, ion substitution experiments |
Frontiers in pharmacology |
High |
39744124
|
| 2026 |
Slick (Slo2.1/KCNT2) channels at the plasma membrane of cardiac fibroblasts and myofibroblasts regulate K+ efflux and modulate store-operated calcium entry (SOCE). Global and CMF-specific conditional Slick KO reduces fibrosis, preserves left ventricular function after ischemia/reperfusion injury, and is associated with diminished myofibroblast activation, reduced inflammation, and improved cardiomyocyte survival. |
Live-cell imaging, whole-cell patch-clamp, global and conditional (CMF-specific) KO mice, ischemia/reperfusion model, histological fibrosis assessment, functional cardiac measurements |
JCI insight |
High |
41842949
|