KRN4884
KRN4884 is a K+ channel opener. In the presence of intracellular ATP (1 mM), KRN4884 (0.1-3 μM) activates KATP channels in a concentration-dependent manner (EC50=0.55 μM).
For research use only. We do not sell to patients.
- CAS No.: 152802-84-1
- Formula: C15H14ClN5
- Molecular Weight:299.76
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Storage:
Please store the product under the recommended conditions in the Certificate of Analysis.
Biological Activity
EC50: 0.55 μM (KATP channel)[1]
KRN4884 (0.3 μM) shifts the concentration-response relationship for ATP-induced KATP channel inhibition to the right and slightly upward direction without altering the slope. After either the spontaneous or Ca2+-induced channel rundown, KRN4884 (1 and 3 μM) partially restores the KATP channel activity. Furthermore, the effect of KRN4884 is augmented by the presence of uridine 5′-diphosphate (3 mM). KRN4884 activates cardiac KATP channels through not only decreasing the sensitivity of the channel to ATP but also directly stimulating the opening of the channel. KRN4884 (0.3 and 3 μM) increases the outward current in a concentration-dependent manner, and the unitary current amplitudes are similar to that of KATP channels in the ATP-free solution[1].
MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.
MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.
Chemical Information
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CAS No. 152802-84-1
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Molecular Weight 299.76
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Formula C15H14ClN5
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SMILES
N#C/N=C(C1=CC(N)=CN=C1)/NCCC2=CC=CC=C2Cl
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Shipping
Room temperature in continental US; may vary elsewhere.
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Storage
Please store the product under the recommended conditions in the Certificate of Analysis.
Protocol
KRN4884 is dissolved in DMSO as a 10 mM stock solution, and diluted in the bath solution. The final concentration of DMSO to which cells are exposed is less than 0.1%[1].
To quantitatively analyze the effect of KRN4884 or other compounds, channel activity is expressed as NPoi. NPoi is calculated by integrating a 5- to 15-s continuous current record during the steady effect of each drug. The concentration-response curve for KRN4884 is obtained by normalizing NPoi to that obtained by superfusing with the ATP-free bath solution, and fit to a Hill equation[1].
MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.
Rats[2]
Five-week old male Sprague-Dawley (Crj; CD) rats are obtained and housed in a temperature-controlled environment with a 12 h daily light cycle with free access to water and chow (CE-2). At 6-weeks old, the animals are assigned to vehicle, Clofibrate (160 mg/kg) or KRN4884 (3 mg/kg) treatment groups. The drug is given daily, by gavage for 10 days at 2 mL/kg as a suspension in 0.5% (w/v) carboxymethyl cellulose. Systolic blood pressure is determined 1 h after administration on day 9 with the tail cu. method by use of a sphygmomanometer. Four hours after the final administration of the drug or vehicle on day 10, non-fasting blood is collected from an abdominal aorta of each rat under ether anaesthesia. Serum is provided for lipid analysis. Epididymal adipose tissue, thigh muscle, and liver are removed and weighed, then immediately immersed in liquid nitrogen and stored at -80°C until use. Epididymal adipose tissue and thigh muscle are used for determining lipoprotein lipase (LPL) activity and the liver is used for de- termining hepatic triglyceride lipase (HTGL) activity.
MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.
Purity & Documentation
References
[1]. Shinbo A, et al. Activation of cardiac ATP-sensitive K+ channels by KRN4884, a novel K+ channel opener. J Pharmacol Exp Ther. 1997 Nov;283(2):770-7. [Content Brief]
[2]. Yokoyama T, et al. Effects of KRN4884, a novel pyridinecarboxamidine type KATP channel opener, on serum triglyceride levels in rats. Br J Pharmacol. 1997 Apr;120(8):1471-6. [Content Brief]
Calculators
Concentration (start) × Volume (start) = Concentration (final) × Volume (final)