ArticleAmerican journal of physiology. Cell physiology2012
KV2.1 and electrically silent KV channel subunits control excitability and contractility of guinea pig detrusor smooth muscle.
Article in American journal of physiology. Cell physiology, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 27 papers.
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Who cites it
27 citing papers in PubMed.
- Inhibition of cancerous properties of triple-negative MDA-MB-436 cells by targeting the KJournal of physiology and biochemistry · 2025Article
- Gene therapy for chronic pain: emerging opportunities in target-rich peripheral nociceptors.Nature reviews. Neuroscience · 2023Review
- Age-dependent decrease in TRPM4 channel expression but not trafficking alters urinary bladder smooth muscle contractility.Physiological reports · 2021Article
- Urinary bladder smooth muscle ion channels: expression, function, and regulation in health and disease.American journal of physiology. Renal physiology · 2020Review
- TRPM4 channel inhibitors 9-phenanthrol and glibenclamide differentially decrease guinea pig detrusor smooth muscle whole-cell cation currents and phasic contractions.American journal of physiology. Cell physiology · 2020Article
- Preparation and Utilization of Freshly Isolated Human Detrusor Smooth Muscle Cells for Characterization of 9-Phenanthrol-Sensitive Cation Currents.Journal of visualized experiments : JoVE · 2020Article
- Detrusor Smooth Muscle KFrontiers in physiology · 2020Review
- Properties of single-channel and whole cell ClAmerican journal of physiology. Cell physiology · 2019Article
- Involvement of transient receptor potential melastatin 4 channels in the resting membrane potential setting and cholinergic contractile responses in mouse detrusor and ileal smooth muscles.The Journal of veterinary medical science · 2019Article
- KThe Journal of pharmacology and experimental therapeutics · 2018Article
- Kv5, Kv6, Kv8, and Kv9 subunits: No simple silent bystanders.The Journal of general physiology · 2016Review
- Review
- The Novel KV7.2/KV7.3 Channel Opener ICA-069673 Reveals Subtype-Specific Functional Roles in Guinea Pig Detrusor Smooth Muscle Excitability and Contractility.The Journal of pharmacology and experimental therapeutics · 2015Article
- Novel mechanism of hydrogen sulfide-induced guinea pig urinary bladder smooth muscle contraction: role of BK channels and cholinergic neurotransmission.American journal of physiology. Cell physiology · 2015Article
- Modulation of Closed-State Inactivation in Kv2.1/Kv6.4 Heterotetramers as Mechanism for 4-AP Induced Potentiation.PloS one · 2015Article
- Central role of the BK channel in urinary bladder smooth muscle physiology and pathophysiology.American journal of physiology. Regulatory, integrative and comparative physiology · 2014Review
- Oxidation of KCNB1 K(+) channels in central nervous system and beyond.World journal of biological chemistry · 2014Review
- Large-conductance voltage- and Ca2+-activated K+ channel regulation by protein kinase C in guinea pig urinary bladder smooth muscle.American journal of physiology. Cell physiology · 2014Article
- Ion channels of the mammalian urethra.Channels (Austin, Tex.) · 2014Review
- Ethanol-mediated relaxation of guinea pig urinary bladder smooth muscle: involvement of BK and L-type Ca2+ channels.American journal of physiology. Cell physiology · 2014Article
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7 authors.
Funding
Abstract
Voltage-gated K(+) (K(V)) channels are implicated in detrusor smooth muscle (DSM) function. However, little is known about the functional role of the heterotetrameric K(V) channels in DSM. In this report, we provide molecular, electrophysiological, and functional evidence for the presence of K(V)2.1 and electrically silent K(V) channel subunits in guinea pig DSM. Stromatoxin-1 (ScTx1), a selective inhibitor of the homotetrameric K(V)2.1, K(V)2.2, and K(V)4.2 as well as the heterotetrameric K(V)2.1/6.3 and K(V)2.1/9.3 channels, was used to examine the role of these K(V) channels in DSM function. RT-PCR indicated mRNA expression of K(V)2.1, K(V)6.2-6.3, K(V)8.2, and K(V)9.1-9.3 subunits in isolated DSM cells. K(V)2.1 protein expression was confirmed by Western blot and immunocytochemistry. Perforated whole cell patch-clamp experiments revealed that ScTx1 (100 nM) inhibited the amplitude of the K(V) current in freshly isolated DSM cells. ScTx1 (100 nM) did not significantly change the steady-state activation and inactivation curves for K(V) current. However, ScTx1 (100 nM) decreased the activation time-constant of the K(V) current at positive voltages. Although our patch-clamp data could not exclude the presence of the homotetrameric K(V)2.1 channels, the biophysical characteristics of the ScTx1-sensitive current were consistent with the presence of heterotetrameric K(V)2.1/silent K(V) channels. Current-clamp recordings showed that ScTx1 (100 nM) did not change the DSM cell resting membrane potential. ScTx1 (100 nM) increased the spontaneous phasic contraction amplitude, muscle force, and muscle tone as well as the amplitude of the electrical field stimulation-induced contractions of isolated DSM strips. Collectively, our data revealed that K(V)2.1-containing channels are important physiological regulators of guinea pig DSM excitability and contractility.
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