GSK-3β (IC50 = 6.7 nM); GSK-3α (IC50 = 10 nM); ATM (cdc2 = 8800 nM)

Laduviglusib trihydrochloride inhibits human GSK-3β with Ki values of 9.8 nM[1]. Laduviglusib trihydrochloride is a tiny organic molecule that inhibits GSK3α and GSK3β by vying for their ATP-binding sites. Laduviglusib trihydrochloride specifically inhibits GSK3β (IC50=~5 nM) and GSK3α (IC50=~10 nM), with little effect on other kinases, according to in vitro kinase assays[4]. Laduviglusib trihydrochloride reduces the viability of ES-D3 cells by 24.7% at 2.5 μM, 56.3% at 5 μM, 61.9% at 7.5 μM and 69.2% at 10 μM, with an IC50 of 4.9 M[2].

Laduviglusib (16 mg/kg or 48 mg/kg) trihydrochloride rapidly lowers plasma glucose in ZDF rats after a single oral dose, with a maximum reduction of almost 150 mg/dl occurring 3–4 h after administration[1]. Survival after 14.5 Gy abdominal irradiation (ABI) is significantly improved by laduviglusib (2 mg/kg) trihydrochloride given once 4 hours prior to radiation. Treatment with laduviglusib trihydrochloride significantly reduces crypt apoptosis, prevents the buildup of p-H2AX+ cells, and enhances crypt regeneration and villus height. Treatment with laduviglusib trihydrochloride boosts Lgr5+ cell survival by preventing apoptosis and successfully delays the loss of Olfm4, Lgr5, and CD44 as early as 4 h[5].

All kinase assays followed the same core protocol with variations in peptide substrate and activator concentrations described below. Polypropylene 96-well plates were filled with 300 μl/well buffer (50 mmol/l tris HCl, 10 mmol/l MgCl2, 1 mmol/l EGTA, 1 mmol/l dithiothreitol, 25 mmol/l β-glycerophosphate, 1 mmol/l NaF, 0.01% BSA, pH 7.5) containing kinase, peptide substrate, and any activators. Information on the kinase concentration, peptide substrate, and activator (if applicable) for these assays is as follows: GSK-3α (27 nmol/l, and 0.5 μmol/l biotin-CREB peptide); GSK-3β (29 nmol/l, and 0.5 μmol/l biotin-CREB peptide); cdc2 (0.8 nmol/l, and 0.5 μmol/l biotin histone H1 peptide); erk2 (400 units/ml, and myelin basic protein-coated Flash Plate [Perkin-Elmer]); PKC-α (1.6 nmol/l, 0.5 μmol/l biotin-histone H1 peptide, and 0.1 mg/ml phosphatidylserine + 0.01 mg/ml diglycerides); PKC-ζ (0.1 nmol/l, 0.5 μmol/l biotin-PKC-86 peptide, and 50 μg/ml phosphatidylserine + 5 μg/ml diacylglycerol); akt1 (5.55 nmol/l, and 0.5 μmol/l biotin phospho-AKT peptide); p70 S6 kinase (1.5 nmol/l, and 0.5 μmol/l biotin-GGGKRRRLASLRA); p90 RSK2 (0.049 units/ml, and 0.5 μmol/l biotin-GGGKRRRLASLRA); c-src (4.1 units/ml, and 0.5 μmol/l biotin-KVEKIGEGTYGVVYK); Tie2 (1 μg/ml, and 200 nmol/l biotin-GGGGAPEDLYKDFLT); flt1 (1.8 nmol/l, and 0.25 μmol/l KDRY1175 [B91616] biotin-GGGGQDGKDYIVLPI-NH2); KDR (0.95 nmol/l, and 0.25 μmol/l KDRY1175 [B91616] biotin-GGGGQDGKDYIVLPI-NH2); bFGF receptor tyrosine kinase (RTK; 2 nmol/l, and 0.25 μmol/l KDRY1175 [B91616] biotin-GGGGQDGKDYIVLPI-NH2); IGF1 RTK (1.91 nmol/l, and 1 μmol/l biotin-GGGGKKKSPGEYVNIEFG-amide); insulin RTK (using DG44 IR cells); AMP kinase (470 units/ml, 50 μmol/l SAMS peptide, and 300 μmol/l AMP); pdk1 (0.25 nmol/l, 2.9 nmol/l unactivated Akt, and 20 μmol/l each of DOPC and DOPS + 2 μmol/l PIP3); CHK1 (1.4 nmol/l, and 0.5 μmol/l biotin-cdc25 peptide); CK1-ε (3 nmol/l, and 0.2 μmol/l biotin-peptide); DNA PK; and phosphatidylinositol (PI) 3-kinase (5 nmol/l, and 2 μg/ml PI). Test compounds or controls were added in 3.5 μl of DMSO, followed by 50 μl of ATP stock to yield a final concentration of 1 μmol/l ATP in all cell-free assays. After incubation, triplicate 100-μl aliquots were transferred to Combiplate eight plates (LabSystems, Helsinki, Finland) containing 100 μl/well 50 μmol/l ATP and 20 mmol/l EDTA. After 1 h, the wells were rinsed five times with PBS, filled with 200 μl of scintillation fluid, sealed, left 30 min, and counted in a scintillation counter. All steps were performed at room temperature. Inhibition was calculated as 100% × (inhibited − no enzyme control)/(DMSO control − no enzyme control).[1]

The loss of cell viability is correlated with the decline in MTT activity, a reliable metabolism-based test for estimating cell viability. In LIF-containing ES cell medium, 2,000 cells are seeded overnight on 96-well plates coated in gelatin. The medium is changed to one without LIF and with reduced serum the following day. It is also supplemented with 0.1-1 μM BIO, or 1-10 μM SB-216763, CHIR-99021, or CHIR-98014. As a control, basal medium devoid of DMSO or GSK3 inhibitors is employed. Three copies of each of the tested conditions were analyzed[3].

Rats[1]: Primary hepatocytes from male Sprague Dawley rats that weighed <140 g are prepared and used 1-3 h after isolation. Centrifuged and lysed by freeze/thaw in buffer A plus 0.01% NP40, aliquots of 1106 cells in 1 mL of DMEM/F12 medium plus 0.2% BSA and CHIR-99021 (orally at 16 or 48 mg/kg) or controls are incubated in 12-well plates for 30 min at 37°C in a CO2-enriched atmosphere. The GS assay is then carried out once more. Mice[4]: The mice used are 6–10 week old mice. The PUMA+/+ and PUMA-/- littermates of Lgr5-EGFP (Lgr5-EGFP-IRES-creERT2) mice are either given abdominal irradiation (ABI) or whole body irradiation (TBI) to induce radiation sickness. Two milligrams per kilogram of CHIR99021 or one milligram per kilogram of SB415286 are intraperitoneally (i.p.) injected into mice four hours prior to radiation treatment. Small intestines are removed from sacrificed mice and subjected to western blotting and histology tests. Before being sacrificed, all mice receive an intraperitoneal injection of 100 mg/kg BrdU.

[1]. Selective glycogen synthase kinase 3 inhibitors potentiate insulin activation of glucose transport and utilization in vitro and in vivo. Diabetes. 2003 Mar;52(3):588-95.

[2]. Cytotoxicity and activation of the Wnt/beta-catenin pathway in mouse embryonic stem cells treated with four GSK3 inhibitors.BMC Res Notes. 2014 Apr 29;7:273.

[3]. Pleiotropy of glycogen synthase kinase-3 inhibition by CHIR99021 promotes self-renewal of embryonic stem cells from refractory mouse strains. PLoS One. 2012;7(4):e35892.

[4]. Regulation of Wnt signaling during adipogenesis. J Biol Chem. 2002 Aug 23;277(34):30998-1004.

[5]. Pharmacologically blocking p53-dependent apoptosis protects intestinal stem cells and mice from radiation. Sci Rep. 2015 Apr 10;5:8566.

CHIR 99021 is a member of the class of aminopyrimidines that is 2-aminopyrimidine substituted at positions N2, 5 and 6 by (5-cyanopyridin-2-yl)ethyl, 4-methylimidazol-2-yl and 2,4-dichlorophenyl groups respectively. It has a role as an EC 2.7.11.26 (tau-protein kinase) inhibitor. It is a member of imidazoles, a dichlorobenzene, an aminopyrimidine, an aminopyridine, a cyanopyridine, a secondary amino compound and a diamine.

C22H21CL5N8

574.72

572.033

C, 45.98; H, 3.68; Cl, 30.84; N, 19.50

1782235-14-6

Laduviglusib;252917-06-9;Laduviglusib monohydrochloride;1797989-42-4

78243722

White to yellow solid powder

6

7

7

35

645

0

ClC1C([H])=C(C([H])=C([H])C=1C1C(=C([H])N=C(N=1)N([H])C([H])([H])C([H])([H])N([H])C1C([H])=C([H])C(C#N)=C([H])N=1)C1=NC([H])=C(C([H])([H])[H])N1[H])Cl.Cl[H].Cl[H].Cl[H]

DSFVSCNMMZRCIA-UHFFFAOYSA-N

InChI=1S/C22H18Cl2N8.3ClH/c1-13-10-29-21(31-13)17-12-30-22(32-20(17)16-4-3-15(23)8-18(16)24)27-7-6-26-19-5-2-14(9-25)11-28-19;;;/h2-5,8,10-12H,6-7H2,1H3,(H,26,28)(H,29,31)(H,27,30,32);3*1H

6-[2-[[4-(2,4-dichlorophenyl)-5-(5-methyl-1H-imidazol-2-yl)pyrimidin-2-yl]amino]ethylamino]pyridine-3-carbonitrile;trihydrochloride

CHIR-73911 3HCl; CHIR911;CHIR 911; CT- 99021; CT-99021; CHIR73911; CHIR 73911 trihydrochloride; CHIR-911; CT- 99021; GSK 3 inhibitor XVI; GSK 3IXV; CHIR99021; CHIR 99021

2934.99.9001

Powder      -20°C    3 years

                     4°C     2 years

In solvent   -80°C    6 months

                  -20°C    1 month

Note: Please store this product in a sealed and protected environment, avoid exposure to moisture.

Room temperature (This product is stable at ambient temperature for a few days during ordinary shipping and time spent in Customs)

Solubility in Formulation 1: ≥ 2.08 mg/mL (3.62 mM) (saturation unknown) in 10% DMSO + 40% PEG300 + 5% Tween80 + 45% Saline (add these co-solvents sequentially from left to right, and one by one), clear solution.
For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 20.8 mg/mL clear DMSO stock solution to 400 μL PEG300 and mix evenly; then add 50 μL Tween-80 to the above solution and mix evenly; then add 450 μL normal saline to adjust the volume to 1 mL.
Preparation of saline: Dissolve 0.9 g of sodium chloride in 100 mL ddH₂ O to obtain a clear solution.

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Solubility in Formulation 2: ≥ 2.08 mg/mL (3.62 mM) (saturation unknown) in 10% DMSO + 90% (20% SBE-β-CD in Saline) (add these co-solvents sequentially from left to right, and one by one), clear solution.
For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 20.8 mg/mL clear DMSO stock solution to 900 μL of 20% SBE-β-CD physiological saline solution and mix evenly.
Preparation of 20% SBE-β-CD in Saline (4°C，1 week): Dissolve 2 g SBE-β-CD in 10 mL saline to obtain a clear solution.

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Solubility in Formulation 3: ≥ 2.08 mg/mL (3.62 mM) (saturation unknown) in 10% DMSO + 90% Corn Oil (add these co-solvents sequentially from left to right, and one by one), clear solution.
For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 20.8 mg/mL clear DMSO stock solution to 900 μL of corn oil and mix evenly.

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 (Please use freshly prepared in vivo formulations for optimal results.)