Kenpaullone - CAS 142273-20-9
Catalog number: 142273-20-9
Category: Inhibitor
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Kenpaullone is a potent inhibitor of CDK1/cyclin B (IC50 = 400 nM), CDK2/cyclin A (IC50 = 680 nM), CDK2/cyclin E (IC50 = 7.5 uM) and CDK5/p25 (IC50 = 850 nM). Kenpaullone inhibits CDK2/cyclin A, CDK2/cyclin E and CDK5/cyclin/p35 (IC50 values are 0.68, 7.5 and 0.85 μM respectively).
Solid powder
NSC664704; NSC-664704; NSC 664704; 9-Bromopaullone; 1-azakenpaullone; Kenpaullone
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1.Paullones, a series of cyclin-dependent kinase inhibitors: synthesis, evaluation of CDK1/cyclin B inhibition, and in vitro antitumor activity.
Schultz C;Link A;Leost M;Zaharevitz DW;Gussio R;Sausville EA;Meijer L;Kunick C J Med Chem. 1999 Jul 29;42(15):2909-19.
The paullones represent a novel class of small molecule cyclin-dependent kinase (CDK) inhibitors. To investigate structure-activity relationships and to develop paullones with antitumor activity, derivatives of the lead structure kenpaullone (9-bromo-7,12-dihydroindolo[3,2-d][1]benzazepin-6(5H)-one, 4a) were synthesized. Paullones with different substituents in the 2-, 3-, 4-, 9-, and 11-positions were prepared by a Fischer indole reaction starting from 1H-[1]benzazepine-2,5(3H,4H)-diones 5. Selective substitutions at either the lactam or the indole nitrogen atom were accomplished by treating kenpaullone with alkyl halides in the presence of sodium hydride/THF or potassium hydroxide/acetone, respectively. S-Methylation of the kenpaullone-derived thiolactam 18 yielded the methylthioimidate 19, which gave the hydroxyamidine 20 upon reaction with hydroxylamine. The new paullones were tested both in a CDK1/cyclin B inhibition assay and in the in vitro antitumor cell line-screening program of the National Cancer Institute (NCI). With respect to the CDK1/cyclin B inhibition, electron-withdrawing substituents in the 9-position as well as a 2,3-dimethoxy substitution on the paullone basic scaffold turned out to be favorable.
2.Cell cycle molecular targets in novel anticancer drug discovery.
Buolamwini JK Curr Pharm Des. 2000 Mar;6(4):379-92.
A number of potential molecular targets for novel anticancer drug discovery have been identified in cell cycle control mechanisms. Prominent among these are the regulatory proteins, cyclins and their effector counterparts the cyclin dependent kinases (CDKs). Aberrant expression of these proteins, particularly cyclins involved in the G1 phase of the cell cycle, namely the D and E cyclins, has been associated with a variety of human cancers, including breast and colorectal cancer, B-lymphoma, prostate and non-small cell lung cancer. Inhibition of CDK kinase activity has turned out to be the most productive strategy for the discovery and design novel anticancer agents specifically targeting the cell cycle. Other potentially useful cell cycle areas for exploration include cyclin-CDK interactions, Cdc25 activation of cyclin-CDK complexes, ubiquitin-mediated proteolysis of cyclins, cell cycle check point kinases like Chk1, and recently identified oncogenic cell cycle-related aurora and polo-like kinases. Potent specific inhibitors have been identified that bind to the ATP site of CDKs, mainly cyclin B-CDK1, cyclin A-CDK2, and cyclin D-CDK4 complexes, and inhibit kinase activity. X-ray crystallographic data of CDKs, and their complexes with inhibitors have played a major role in the success of drug discovery efforts.
3.Glycogen synthase kinase-3β inhibition ameliorates cardiac parasympathetic dysfunction in type 1 diabetic Akita mice.
Zhang Y;Welzig CM;Picard KL;Du C;Wang B;Pan JQ;Kyriakis JM;Aronovitz MJ;Claycomb WC;Blanton RM;Park HJ;Galper JB Diabetes. 2014 Jun;63(6):2097-113. doi: 10.2337/db12-1459. Epub 2014 Jan 23.
Decreased heart rate variability (HRV) is a major risk factor for sudden death and cardiovascular disease. We previously demonstrated that parasympathetic dysfunction in the heart of the Akita type 1 diabetic mouse was due to a decrease in the level of the sterol response element-binding protein (SREBP-1). Here we demonstrate that hyperactivity of glycogen synthase kinase-3β (GSK3β) in the atrium of the Akita mouse results in decreased SREBP-1, attenuation of parasympathetic modulation of heart rate, measured as a decrease in the high-frequency (HF) fraction of HRV in the presence of propranolol, and a decrease in expression of the G-protein coupled inward rectifying K(+) (GIRK4) subunit of the acetylcholine (ACh)-activated inward-rectifying K(+) channel (IKACh), the ion channel that mediates the heart rate response to parasympathetic stimulation. Treatment of atrial myocytes with the GSK3β inhibitor Kenpaullone increased levels of SREBP-1 and expression of GIRK4 and IKACh, whereas a dominant-active GSK3β mutant decreased SREBP-1 and GIRK4 expression. In Akita mice treated with GSK3β inhibitors Li(+) and/or CHIR-99021, Li(+) increased IKACh, and Li(+) and CHIR-99021 both partially reversed the decrease in HF fraction while increasing GIRK4 and SREBP-1 expression.
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CAS 142273-20-9 Kenpaullone

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