KATP Channel-Independent Pathway and the Glucoreceptor

2018 ◽  
pp. 37-49
Author(s):  
Toru Aizawa ◽  
Mitsuhisa Komatsu
Keyword(s):  
Katp Channel

Enhanced PIP3 signaling in POMC neurons causes diet-sensitive obesity as the consequence of neuronal silencing via KATP channel activation

2006 ◽  
Vol 1 (S 1) ◽  
Author(s):  
L Plum ◽  
X Ma ◽  
B Hampel ◽  
H Münzberg ◽  
M Shanabrough ◽  
...  
Keyword(s):  
Katp Channel ◽  
Channel Activation

Intellectual disability in KATP channel neonatal diabetes

2020 ◽  
Author(s):  
Svalastoga P ◽  
Sulen A ◽  
Fehn JR ◽  
Aukland SM ◽  
Irgens H ◽  
...  
Keyword(s):  
Intellectual Disability ◽  
Katp Channel ◽  
Neonatal Diabetes

Central KATP channels modulate glucose effectiveness in humans and rodents

2020 ◽  
Author(s):  
Ada Admin ◽  
Michelle Carey ◽  
Eric Lontchi-Yimagou ◽  
William Mitchell ◽  
Sarah Reda ◽  
...  
Keyword(s):  
Katp Channel ◽  
Glucose Production ◽  
Katp Channels ◽  
Endogenous Glucose Production ◽  
Elevated Plasma ◽  
Sprague Dawley ◽  
Glucose Effectiveness ◽  
Sprague Dawley Rats ◽  
The Central Nervous System

Hyperglycemia is a potent regulator of endogenous glucose production (EGP). Loss of this ‘glucose effectiveness’ is a major contributor to elevated plasma glucose concentrations in type 2 diabetes (T2D). ATP-sensitive potassium channels (K<sub>ATP</sub> channels) in the central nervous system (CNS) have been shown to regulate EGP in humans and rodents. We examined the contribution of central K<sub>ATP</sub> channels to glucose effectiveness. Under fixed hormonal conditions (‘pancreatic clamp’ studies), hyperglycemia suppressed EGP by ~50% in both non-diabetic humans and normal Sprague Dawley rats. By contrast, antagonism of K<sub>ATP</sub> channels with glyburide significantly reduced the EGP-lowering effect of hyperglycemia in both humans and rats. Furthermore, the effects of glyburide on EGP and gluconeogenic enzymes in rats were abolished by intracerebroventricular (ICV) administration of the KATP channel agonist diazoxide. These findings indicate that about half of EGP suppression by hyperglycemia is mediated by central K<sub>ATP</sub> channels. These central mechanisms may offer a novel therapeutic target for improving glycemic control in T2D.

Design, Synthesis and Biological Evaluation of Benzopyran Derivatives as KATP Channel Openers

2010 ◽  
Vol 7 (6) ◽  
pp. 415-420 ◽  
Author(s):  
Jinpei Zhou ◽  
Hai Qian ◽  
Huibin Zhang ◽  
Hui Gao ◽  
Wenlong Huang ◽  
...  
Keyword(s):  
Katp Channel ◽  
Biological Evaluation ◽  
Design Synthesis ◽  
Synthesis And Biological Evaluation ◽  
Katp Channel Openers

scholarly journals Consequences of SUR2[A478V] Mutation in Skeletal Muscle of Murine Model of Cantu Syndrome

Cells ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 1791
Author(s):  
Rosa Scala ◽  
Fatima Maqoud ◽  
Nicola Zizzo ◽  
Giuseppe Passantino ◽  
Antonietta Mele ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Katp Channel ◽  
Ex Vivo ◽  
Channel Modulation ◽  
Flexor Digitorum Brevis ◽  
Inflammatory Edema ◽  
Flexor Digitorum ◽  
Channel Currents

(1) Background: Cantu syndrome (CS) arises from gain-of-function (GOF) mutations in the ABCC9 and KCNJ8 genes, which encode ATP-sensitive K+ (KATP) channel subunits SUR2 and Kir6.1, respectively. Most CS patients have mutations in SUR2, the major component of skeletal muscle KATP, but the consequences of SUR2 GOF in skeletal muscle are unknown. (2) Methods: We performed in vivo and ex vivo characterization of skeletal muscle in heterozygous SUR2[A478V] (SUR2wt/AV) and homozygous SUR2[A478V] (SUR2AV/AV) CS mice. (3) Results: In SUR2wt/AV and SUR2AV/AV mice, forelimb strength and diaphragm amplitude movement were reduced; muscle echodensity was enhanced. KATP channel currents recorded in Flexor digitorum brevis fibers showed reduced MgATP-sensitivity in SUR2wt/AV, dramatically so in SUR2AV/AV mice; IC50 for MgATP inhibition of KATP currents were 1.9 ± 0.5 × 10−5 M in SUR2wt/AV and 8.6 ± 0.4 × 10−6 M in WT mice and was not measurable in SUR2AV/AV. A slight rightward shift of sensitivity to inhibition by glibenclamide was detected in SUR2AV/AV mice. Histopathological and qPCR analysis revealed atrophy of soleus and tibialis anterior muscles and up-regulation of atrogin-1 and MuRF1 mRNA in CS mice. (4) Conclusions: SUR2[A478V] “knock-in” mutation in mice impairs KATP channel modulation by MgATP, markedly so in SUR2AV/AV, with atrophy and non-inflammatory edema in different skeletal muscle phenotypes.

scholarly journals AKAP79/150 coordinates leptin-induced PKA signaling to regulate KATP channel trafficking in pancreatic β-cells

2021 ◽  
pp. 100442
Author(s):  
Veronica A. Cochrane ◽  
Zhongying Yang ◽  
Mark L. Dell’Acqua ◽  
Show-Ling Shyng
Keyword(s):  
Katp Channel ◽  
Β Cells ◽  
Pancreatic Β Cells ◽  
Channel Trafficking
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