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ATP sensitive potassium channel

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https://www.readbyqxmd.com/read/28322929/exogenous-h2s-prevents-high-glucose-induced-damage-to-osteoblasts-through-regulation-of-katp-channels
#1
Yuanyuan Liu, Jianyong Liu, Xin Li, Fantao Wang, Xin Xu, Chunling Wang
Association between diabetes and osteoporosis has been extensively investigated. However, whether the effects of H2S on osteoblast function under high glucose (HG) condition relate to ATP-sensitive potassium (KATP) channels is unclear. To investigate the effects of H2S on the proliferation, apoptosis, and mineralization of osteoblasts under HG condition, and to observe whether H2S exert this effect through the KATP channels. Primary osteoblasts (POBs) were obtained from the calvaria of Sprague-Dawley rats. Cells were pre-treated with 400 μmol/L NaHS (a H2S donor), and/or 0...
March 16, 2017: Biochimie
https://www.readbyqxmd.com/read/28270043/roles-of-atp-sensitive-potassium-channel-in-modulating-gastric-tone-and-accommodation-in-dogs
#2
Shiying Li, Yong Lei, Jiande Dz Chen
OBJECTIVE: The ATP sensitive potassium (KATP) channel plays an important role in the regulation of resting membrane potential and membrane excitability. The role of the KATP channel in modulating gastric motility is unclear. The aim of this study was to investigate the role and mechanism of the KATP channel in modulating gastric tone and accommodation in dogs. MATERIALS AND METHODS: Gastric volume under a constant pressure reflecting gastric tone was measured using a barostat device in dogs equipped with a gastric cannula...
May 2017: Scandinavian Journal of Gastroenterology
https://www.readbyqxmd.com/read/28262438/neonatal-diabetes-and-the-katp-channel-from-mutation-to-therapy
#3
REVIEW
Frances M Ashcroft, Michael C Puljung, Natascia Vedovato
Activating mutations in one of the two subunits of the ATP-sensitive potassium (KATP) channel cause neonatal diabetes (ND). This may be either transient or permanent and, in approximately 20% of patients, is associated with neurodevelopmental delay. In most patients, switching from insulin to oral sulfonylurea therapy improves glycemic control and ameliorates some of the neurological disabilities. Here, we review how KATP channel mutations lead to the varied clinical phenotype, how sulfonylureas exert their therapeutic effects, and why their efficacy varies with individual mutations...
March 2, 2017: Trends in Endocrinology and Metabolism: TEM
https://www.readbyqxmd.com/read/28222502/subclinical-doses-of-atp-sensitive-potassium-channel-modulators-prevent-alterations-in-memory-and-synaptic-plasticity-induced-by-amyloid-%C3%AE
#4
Karla Salgado-Puga, Javier Rodríguez-Colorado, Roberto A Prado-Alcalá, Fernando Peña-Ortega
In addition to coupling cell metabolism and excitability, ATP-sensitive potassium channels (KATP) are involved in neural function and plasticity. Moreover, alterations in KATP activity and expression have been observed in Alzheimer's disease (AD) and during amyloid-β (Aβ)-induced pathology. Thus, we tested whether KATP modulators can influence Aβ-induced deleterious effects on memory, hippocampal network function, and plasticity. We found that treating animals with subclinical doses (those that did not change glycemia) of a KATP blocker (Tolbutamide) or a KATP opener (Diazoxide) differentially restrained Aβ-induced memory deficit, hippocampal network activity inhibition, and long-term synaptic plasticity unbalance (i...
2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28214687/gastroprotective-effect-and-mechanism-of-action-of-croton-rhamnifolioides-essential-oil-in-mice
#5
Cinara Soares Vidal, Anita Oliveira Brito Pereira Bezerra Martins, Andressa de Alencar Silva, Maria Rayane Correia de Oliveira, Jaime Ribeiro-Filho, Thaís Rodrigues de Albuquerque, Henrique Douglas Melo Coutinho, Jackson Roberto Guedes da Silva Almeida, Lucindo Jose Quintans, Irwin Rose Alencar de Menezes
BACKGROUND: Croton rhamnifolioides Pax is a plant species that have been used in the folk medicine to treat ulcers, inflammations and hypertension. However, despite the relevant data obtained from ethnopharmacological studies, the pharmacological properties endorsing the efficacy of this plant to treat ulcer remain to be elucidated. HYPOTHESIS/PURPOSE: The present study aimed to characterize the chemical profile and evaluate the gastroprotective activity of the essential oil obtained from C...
February 16, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28212804/potassium-channels-in-regulation-of-vascular-smooth-muscle-contraction-and-growth
#6
W F Jackson
Potassium channels importantly contribute to the regulation of vascular smooth muscle (VSM) contraction and growth. They are the dominant ion conductance of the VSM cell membrane and importantly determine and regulate membrane potential. Membrane potential, in turn, regulates the open-state probability of voltage-gated Ca(2+) channels (VGCC), Ca(2+) influx through VGCC, intracellular Ca(2+), and VSM contraction. Membrane potential also affects release of Ca(2+) from internal stores and the Ca(2+) sensitivity of the contractile machinery such that K(+) channels participate in all aspects of regulation of VSM contraction...
2017: Advances in Pharmacology
https://www.readbyqxmd.com/read/28179209/administration-of-anabolic-steroid-during-adolescence-induces-long-term-cardiac-hypertrophy-and-increases-susceptibility-to-ischemia-reperfusion-injury-in-adult-wistar-rats
#7
Fernando de Azevedo Cruz Seara, Raiana Andrade Quintanilha Barbosa, Dahienne Ferreira de Oliveira, Diorney Luiz Souza Gran da Silva, Adriana Bastos Carvalho, Andrea Claudia Freitas Ferreira, José Hamilton Matheus Nascimento, Emerson Lopes Olivares
Chronic administration of anabolic androgenic steroids (AAS) in adult rats results in cardiac hypertrophy and increased susceptibility to myocardial ischemia/reperfusion (IR) injury. Molecular analyses demonstrated that hyperactivation of type 1 angiotensin II (AT1) receptor mediates cardiac hypertrophy induced by AAS and also induces down-regulation of myocardial ATP-sensitive potassium channel (KATP), resulting in loss of exercise-induced cardioprotection. Exposure to AAS during adolescence promoted long-term cardiovascular dysfunctions, such as dysautonomia...
February 5, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28177665/possible-involvement-of-atp-sensitive-potassium-channels-in-the-antidepressant-like-effects-of-gabapentin-in-mice-forced-swimming-test
#8
Sattar Ostadhadi, Reyhaneh Akbarian, Abbas Norouzi-Javidan, Vahid Nikoui, Samira Zolfaghari, Mohsen Chamanara, Ahmad-Reza Dehpour
Gabapentin as an anticonvulsant drug also has beneficial effects in treatment of depression. Previously we showed that acute administration of gabapentin produced an antidepressant-like effect in the mouse forced swimming test (FST) by a mechanism involves the inhibition of the nitric oxide (NO). Considering the involvement of NO in adenosine triphosphate (ATP)-sensitive potassium channels (KATP), in the present study we investigated the involvement of KATP channels in antidepressant-like effect of gabapentin...
January 29, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28163539/inhibition-by-tadalafil-of-contractility-of-isolated-nonpregnant-human-myometrium
#9
Sumalya Sen, Anitha Thomas, Saibal Das, Jayanta Kumar Dey, Abraham Peedicayil, Vinotha Thomas, Jacob Peedicayil
OBJECTIVE: To investigate the inhibitory effect of tadalafil on the contractility of isolated nonpregnant human myometrium. MATERIALS AND METHODS: The ability of tadalafil (25, 40, and 63 μM) to inhibit 55 mM KCl-induced contractility of isolated nonpregnant human myometrium was studied. The ability of the ATP-sensitive potassium channel blocker glibenclamide (10 μM) and the calcium-sensitive potassium channel (BKCa) blocker iberiotoxin (100 nM) to reverse the inhibitory effect of 40 μM tadalafil on 55 mM KCl-induced myometrial contractility was also studied...
October 2016: Journal of Pharmacology & Pharmacotherapeutics
https://www.readbyqxmd.com/read/28161195/activation-of-atp-sensitive-potassium-channel-by-iptakalim-normalizes-stress-induced-hpa-axis-disorder-and-depressive-behaviour-by-alleviating-inflammation-and-oxidative-stress-in-mouse-hypothalamus
#10
Xiao-Jie Zhao, Zhan Zhao, Dan-Dan Yang, Lu-Lu Cao, Ling Zhang, Juan Ji, Jun Gu, Ji-Ye Huang, Xiu-Lan Sun
Stress-induced disturbance of the hypothalamic-pituitary-adrenal (HPA) axis is strongly implicated in incidence of mood disorders. A heightened neuroinflammatory response and oxidative stress play a fundamental role in the dysfunction of the HPA axis. We have previously demonstrated that iptakalim (Ipt), a new ATP-sensitive potassium (K-ATP) channel opener, could prevent oxidative injury and neuroinflammation against multiple stimuli-induced brain injury. The present study was to demonstrate the impacts of Ipt in stress-induced HPA axis disorder and depressive behavior...
February 1, 2017: Brain Research Bulletin
https://www.readbyqxmd.com/read/28123328/enhanced-antidiabetic-efficacy-and-safety-of-compound-k%C3%A2-%C3%AE-cyclodextrin-inclusion-complex-in-zebrafish
#11
Youn Hee Nam, Hoa Thi Le, Isabel Rodriguez, Eun Young Kim, Keonwoo Kim, Seo Yule Jeong, Sang Ho Woo, Yeong Ro Lee, Rodrigo Castañeda, Jineui Hong, Min Gun Ji, Ung-Jin Kim, Bin Na Hong, Tae Woo Kim, Tong Ho Kang
BACKGROUND: 20(S)-Protopanaxadiol 20-O-D-glucopyranoside, also called compound K (CK), exerts antidiabetic effects that are mediated by insulin secretion through adenosine triphosphate (ATP)-sensitive potassium (KATP) channels in pancreatic β-cells. However, the antidiabetic effects of CK may be limited because of its low bioavailability. METHODS: In this study, we aimed to enhance the antidiabetic activity and lower the toxicity of CK by including it with β-cyclodextrin (CD) (CD-CK), and to determine whether the CD-CK compound enhanced pancreatic islet recovery, compared to CK alone, in an alloxan-induced diabetic zebrafish model...
January 2017: Journal of Ginseng Research
https://www.readbyqxmd.com/read/28119170/existence-of-atp-sensitive-potassium-currents-on-human-periodontal-ligament-cells
#12
Phuong Thi Huyen Tran, Young Hee Lee, Janardhan Prasad Bhattarai, Soo Joung Park, Ho-Keun Yi, Seong Kyu Han
OBJECTIVE: Potassium channels of the ATP-sensitive family (KATP channel) are inhibited by increase in intracellular ATP. Electrophysiological studies have demonstrated that the kinetics and pharmacological properties of KATP channels vary among different tissues, suggesting structurally and functionally distinct types. There are studies showing human periodontal ligament (PDL) cells respond to mechanical stress by increasing ATP release, which participates in bone resorption or bone homeostasis...
January 17, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28104983/hydrogen-sulfide-attenuates-gastric-mucosal-injury-induced-by-restraint-water-immersion-stress-via-activation-of-katp-channel-and-nf-%C3%AE%C2%BAb-dependent-pathway
#13
Hong-Zhao Sun, Shan Zheng, Kai Lu, Feng-Tian Hou, Jie-Xue Bi, Xue-Lian Liu, Shan-Shan Wang
AIM: To explore the effect of hydrogen sulfide (H2S) on restraint water-immersion stress (RWIS)-induced gastric lesions in rats and the influence of adenosine triphosphate (ATP)-sensitive potassium (KATP) channels and nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB) pathway on such an effect. METHODS: Male Wistar rats were randomly divided into a control group, a physiological saline (PS) group, a sodium hydrosulfide (NaHS) group, a glibenclamide (Gl) group, Gl plus NaHS group, a pyrrolidine dithiocarbamate (PDTC) group, and a PDTC plus NaHS group...
January 7, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28101177/analysis-on-mechanism-of-atp-sensitive-k-channel-opener-natakalim-improving-congestive-heart-failure-after-myocardial-infarction
#14
Feng Jin
The action mechanism of natakalim, a novel ATP-sensitive potassium channel opener, was studied in ameliorating the congestive heart failure (CHF) after myocardial infarction. A total of 25 healthy Wistar male rats (age, 10 weeks; average weight, 300 g) were selected, and the CHF models after acute myocardial infarction (AMI) were prepared by ligation of left anterior descending branch. They were randomly divided into the sham operation group, the model group and the groups of 1, 3 and 9 mg/kg/day natakalims...
December 2016: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28092267/cryo-em-structure-of-the-atp-sensitive-potassium-channel-illuminates-mechanisms-of-assembly-and-gating
#15
Gregory M Martin, Craig Yoshioka, Emily A Rex, Jonathan F Fay, Qing Xie, Matthew R Whorton, James Z Chen, Show-Ling Shyng
KATP channels are metabolic sensors that couple cell energetics to membrane excitability. In pancreatic β-cells, channels formed by SUR1 and Kir6.2 regulate insulin secretion and are the targets of antidiabetic sulfonylureas. Here, we used cryo-EM to elucidate structural basis of channel assembly and gating. The structure, determined in the presence of ATP and the sulfonylurea glibenclamide, at ~6 Å resolution reveals a closed Kir6.2 tetrameric core with four peripheral SUR1s each anchored to a Kir6.2 by its N-terminal transmembrane domain (TMD0)...
January 16, 2017: ELife
https://www.readbyqxmd.com/read/28076808/spatiotemporal-modeling-of-triggering-and-amplifying-pathways-in-glp-1-secreting-intestinal-l-cells
#16
Alessia Tagliavini, Morten Gram Pedersen
Glucagon-like peptide 1 (GLP-1) is secreted by intestinal L-cells, and augments glucose-induced insulin secretion, thus playing an important role in glucose control. The stimulus-secretion pathway in L-cells is still incompletely understood and a topic of debate. It is known that GLP-1 secreting cells can sense glucose to promote electrical activity either by the electrogenic sodium-glucose cotransporter SGLT1, or by closure of ATP-sensitive potassium channels after glucose metabolism. Glucose also has an effect on GLP-1 secretion downstream of electrical activity...
January 10, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28065754/mechanisms-involved-in-antinociception-induced-by-a-polysulfated-fraction-from-seaweed-gracilaria-cornea-in-the-temporomandibular-joint-of-rats
#17
Chistiane Oliveira Coura, Hellíada Vasconcelos Chaves, Danielle Rocha do Val, Lorena Vasconcelos Vieira, Felipe Dantas Silveira, Fernanda Maxcynne Lino Dos Santos Lopes, Francisco Isaac Fernandes Gomes, Annyta Fernandes Frota, Ricardo Basto Souza, Juliana Trindade Clemente-Napimoga, Mirna Marques Bezerra, Norma Maria Barros Benevides
Temporomandibular disorder is a common clinical condition involving pain in the temporomandibular joint (TMJ) region. This study assessed the antinociceptive effects of a polysulfated fraction from the red seaweed Gracilaria cornea (Gc-FI) on the formalin-induced TMJ hypernociception in rats and investigated the involvement of different mechanisms. Male Wistar rats were pretreated with injection (sc) of saline or Gc-FI 1h before intra- TMJ injection of formalin to evaluate the nociception. The results showed that pretreatment with Gc-FI significantly reduced formalin-induced nociceptive behavior...
April 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28054274/nicorandil-improves-post-fatigue-tension-in-slow-skeletal-muscle-fibers-by-modulating-glutathione-redox-state
#18
E Sánchez-Duarte, X Trujillo, C Cortés-Rojo, A Saavedra-Molina, G Camargo, L Hernández, M Huerta, R Montoya-Pérez
Fatigue is a phenomenon in which force reduction has been linked to impairment of several biochemical processes. In skeletal muscle, the ATP-sensitive potassium channels (KATP) are actively involved in myoprotection against metabolic stress. They are present in sarcolemma and mitochondria (mitoKATP channels). K(+) channel openers like nicorandil has been recognized for their ability to protect skeletal muscle from ischemia-reperfusion injury, however, the effects of nicorandil on fatigue in slow skeletal muscle fibers has not been explored, being the aim of this study...
January 4, 2017: Journal of Bioenergetics and Biomembranes
https://www.readbyqxmd.com/read/28042862/hydrogen-sulfide-in-the-adipose-tissue-physiology-pathology-and-a-target-for-pharmacotherapy
#19
REVIEW
Jerzy Bełtowski, Anna Jamroz-Wiśniewska
Hydrogen sulfide (H₂S) is synthesized in the adipose tissue mainly by cystathionine γ-lyase (CSE). Several studies have demonstrated that H₂S is involved in adipogenesis, that is the differentiation of preadipocytes to adipocytes, most likely by inhibiting phosphodiesterases and increasing cyclic AMP concentration. The effect of H₂S on adipose tissue insulin sensitivity and glucose uptake is controversial. Some studies suggest that H₂S inhibits insulin-induced glucose uptake and that excess of H₂S contributes to adipose tissue insulin resistance in metabolic syndrome...
December 31, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28035625/effect-of-dexmedetomidine-on-cerebral-ischemia-reperfusion-rats-by-activating-mitochondrial-atp-sensitive-potassium-channel
#20
Feng Yuan, Hongguang Fu, Kai Sun, Shubiao Wu, Tieli Dong
The aim of the study reported here was to evaluate whether the mitochondrial ATP-sensitive potassium (mitoKATP) channel could participate in the effect of dexmedetomidine on cerebral ischemia-reperfusion (I/R) rats. Forty rats were randomly assigned into 5 groups: sham operation (S) group; cerebral I/R group; dexmedetomidine (D) group; 5-hydroxydecanoate (5-HD) group; 5-HD + D group. The cerebral I/R were produced by 2 h right middle cerebral artery occlusion followed by 24 h reperfusion. Dexmedetomidine (50μg/kg) was injected intraperitoneally before ischemia and after the onset of reperfusion...
April 2017: Metabolic Brain Disease
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