HLI373 is a potent Hdm2 inhibitor. HLI373 inhibits Hdm2 ubiquitin ligase activity. HLI373 can effectively cause apoptosis in tumor cells (sensitive to DNA damaging agents). Has antimalarial activity.

Physicochemical Properties

Molecular Formula	C18H23N5O2
Molecular Weight	341.415
Exact Mass	413.139
CAS #	502137-98-6
Related CAS #	1782531-99-0(HCl);502137-98-6;
PubChem CID	135403620
Appearance	Typically exists as solid at room temperature
LogP	2.826
Hydrogen Bond Donor Count	1
Hydrogen Bond Acceptor Count	5
Rotatable Bond Count	4
Heavy Atom Count	25
Complexity	625
Defined Atom Stereocenter Count	0
SMILES	O=C1C2/C(/C3=C([H])C([H])=C([H])C([H])=C3N(C([H])([H])[H])C=2N([H])C(N1C([H])([H])[H])=O)=N/C([H])([H])C([H])([H])C([H])([H])N(C([H])([H])[H])C([H])([H])[H]
InChi Key	ACSJNMXHJOVJON-UHFFFAOYSA-N
InChi Code	InChI=1S/C18H23N5O2/c1-21(2)11-7-10-19-15-12-8-5-6-9-13(12)22(3)16-14(15)17(24)23(4)18(25)20-16/h5-6,8-9H,7,10-11H2,1-4H3,(H,20,25)
Chemical Name	5-[3-(dimethylamino)propylimino]-3,10-dimethyl-1H-pyrimido[4,5-b]quinoline-2,4-dione
Synonyms	HLI 373; HLI-373; HLI373
HS Tariff Code	2934.99.9001
Storage	Powder-20°C 3 years 4°C 2 years In solvent -80°C 6 months -20°C 1 month
Shipping Condition	Room temperature (This product is stable at ambient temperature for a few days during ordinary shipping and time spent in Customs)

Biological Activity

ln Vitro	Tumor cells expressing wild-type p53 are specifically eliminated by HLI373 (3-15 μM; 15 hours) [1]. Cellular Hdm2 is stabilized in a dose-dependent manner by HLI373 (10-50 μM). Transcription of p53 is activated by HLI373 (3 μM) [1]. HLI373 specifically prevents Hdm2 from being autoubiquitinated [1]. Degradation of p53 occurs when plasmids encoding Hdm2 and p53 are cotransfected. HLI373 (5–10 μM; 8 hours) incubation stops p53 degradation. HLI373 raises the amounts of the proteins Hdm2 and p53 in cells [1]. In addition, HLI 373 demonstrated early growth inhibition and low IC50 values (less than 6 μM) against the chloroquine-sensitive P. falciparum D6 strain (PfD6) and the chloroquine-resistant P. falciparum W2 strain (PfW2) [2]. The MDM2 inhibitor HLI-373 prevents the substrate protein p53 from being ubiquitinated by blocking its ubiquitin E3 ligase function. HLI-373 functions as an E3 ubiquitin ligase and targets the C terminus [3].
Cell Assay	Cell Viability Assay[1] Cell Types: Wild-type p53 mouse embryonic fibroblasts (MEFs) and p53-deficient MEFs Tested Concentrations: 3, 10, 15 μM Incubation Duration: 15 hrs (hours) Experimental Results: Cell death of wild-type p53 MEFs at dose In a dependent manner, p53-deficient MEFs were relatively resistant. Western Blot Analysis[1] Cell Types: U2OS Cell Tested Concentrations: 5, 10 μM Incubation Duration: 8 hrs (hours) Experimental Results: Blocks p53 degradation caused by co-transfection of plasmids encoding p53 and Hdm2.
References	[1]. Targeting Tumor Cells Expressing p53 With a Water-Soluble Inhibitor of Hdm2. Mol Cancer Ther. 2008 Aug;7(8):2445-54. [2]. Inhibitors of Ubiquitin E3 Ligase as Potential New Antimalarial Drug Leads. BMC Pharmacol Toxicol. 2017 Jun 2;18(1):40. [3]. MDM2 Promotes Epithelial-Mesenchymal Transition and Metastasis of Ovarian Cancer SKOV3 Cells. Br J Cancer. 2017 Oct 10;117(8):1192-1201.
Additional Infomation	5-[3-(dimethylamino)propylamino]-3,10-dimethylpyrimido[4,5-b]quinoline-2,4-dione is an aminoquinoline.

Solubility Data

Solubility (In Vitro)

May dissolve in DMSO (in most cases), if not, try other solvents such as H2O, Ethanol, or DMF with a minute amount of products to avoid loss of samples

Solubility (In Vivo)

Note: Listed below are some common formulations that may be used to formulate products with low water solubility (e.g. < 1 mg/mL), you may test these formulations using a minute amount of products to avoid loss of samples. Injection Formulations (e.g. IP/IV/IM/SC) Injection Formulation 1: DMSO : Tween 80： Saline = 10 : 5 : 85 (i.e. 100 μL DMSO stock solution → 50 μL Tween 80 → 850 μL Saline) *Preparation of saline: Dissolve 0.9 g of sodium chloride in 100 mL ddH ₂ O to obtain a clear solution. Injection Formulation 2: DMSO : PEG300 ：Tween 80 : Saline = 10 : 40 : 5 : 45 (i.e. 100 μL DMSO → 400 μLPEG300 → 50 μL Tween 80 → 450 μL Saline) Injection Formulation 3: DMSO : Corn oil = 10 : 90 (i.e. 100 μL DMSO → 900 μL Corn oil) Example: Take the Injection Formulation 3 (DMSO : Corn oil = 10 : 90) as an example, if 1 mL of 2.5 mg/mL working solution is to be prepared, you can take 100 μL 25 mg/mL DMSO stock solution and add to 900 μL corn oil, mix well to obtain a clear or suspension solution (2.5 mg/mL, ready for use in animals). Injection Formulation 4: DMSO : 20% SBE-β-CD in saline = 10 : 90 [i.e. 100 μL DMSO → 900 μL (20% SBE-β-CD in saline)] *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. Injection Formulation 5: 2-Hydroxypropyl-β-cyclodextrin : Saline = 50 : 50 (i.e. 500 μL 2-Hydroxypropyl-β-cyclodextrin → 500 μL Saline) Injection Formulation 6: DMSO : PEG300 : castor oil : Saline = 5 : 10 : 20 : 65 (i.e. 50 μL DMSO → 100 μLPEG300 → 200 μL castor oil → 650 μL Saline) Injection Formulation 7: Ethanol : Cremophor : Saline = 10： 10 : 80 (i.e. 100 μL Ethanol → 100 μL Cremophor → 800 μL Saline) Injection Formulation 8: Dissolve in Cremophor/Ethanol (50 : 50), then diluted by Saline Injection Formulation 9: EtOH : Corn oil = 10 : 90 (i.e. 100 μL EtOH → 900 μL Corn oil) Injection Formulation 10: EtOH : PEG300：Tween 80 : Saline = 10 : 40 : 5 : 45 (i.e. 100 μL EtOH → 400 μLPEG300 → 50 μL Tween 80 → 450 μL Saline) Oral Formulations Oral Formulation 1: Suspend in 0.5% CMC Na (carboxymethylcellulose sodium) Oral Formulation 2: Suspend in 0.5% Carboxymethyl cellulose Example: Take the Oral Formulation 1 (Suspend in 0.5% CMC Na) as an example, if 100 mL of 2.5 mg/mL working solution is to be prepared, you can first prepare 0.5% CMC Na solution by measuring 0.5 g CMC Na and dissolve it in 100 mL ddH2O to obtain a clear solution; then add 250 mg of the product to 100 mL 0.5% CMC Na solution, to make the suspension solution (2.5 mg/mL, ready for use in animals). Oral Formulation 3: Dissolved in PEG400 Oral Formulation 4: Suspend in 0.2% Carboxymethyl cellulose Oral Formulation 5: Dissolve in 0.25% Tween 80 and 0.5% Carboxymethyl cellulose Oral Formulation 6: Mixing with food powders Note: Please be aware that the above formulations are for reference only. InvivoChem strongly recommends customers to read literature methods/protocols carefully before determining which formulation you should use for in vivo studies, as different compounds have different solubility properties and have to be formulated differently.  (Please use freshly prepared in vivo formulations for optimal results.)

Preparing Stock Solutions		1 mg	5 mg	10 mg
	1 mM	2.9289 mL	14.6447 mL	29.2894 mL
	5 mM	0.5858 mL	2.9289 mL	5.8579 mL
	10 mM	0.2929 mL	1.4645 mL	2.9289 mL

*Note: Please select an appropriate solvent for the preparation of stock solution based on your experiment needs. For most products, DMSO can be used for preparing stock solutions (e.g. 5 mM, 10 mM, or 20 mM concentration); some products with high aqueous solubility may be dissolved in water directly. Solubility information is available at the above Solubility Data section. Once the stock solution is prepared, aliquot it to routine usage volumes and store at -20°C or -80°C. Avoid repeated freeze and thaw cycles.