PF-3758309 (PF-03758309) di-HCl is a potent, orally bioavailable, reversible ATP-competitive PAK4 inhibitor (Kd= 2.7 nM; Ki=18.7 nM). PF-3758309 di-HCl displays the expected cellular functions of a PAK4 inhibitor: inhibition of anchorage-independent growth, induction of apoptosis, cytoskeletal remodeling, and inhibition of proliferation.

Physicochemical Properties

Molecular Formula	C25H32CL2N8OS
Molecular Weight	563.55
Related CAS #	PF-3758309;898044-15-0;PF-3758309 hydrochloride;1279034-84-2
Appearance	Typically exists as solid at room temperature
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

Targets	PAK4 18.7 nM (Ki) PAK1 13.7 nM (Ki) PAK5 18.1 nM (Ki) PAK6 17.1 nM (Ki) PAK2 190 nM (IC50) PAK3 99 nM (IC50) PAK4 2.7 nM (Kd)
ln Vitro	PF-3758309 dihydrochloride is less active against the other two group A PAKs (PAK2, IC50=190 nM; PAK3, IC50=99 nM) but exhibits similar enzymatic potency against the kinase domains of the other group B PAKs (PAK5, Ki=18.1 nM; PAK6, Ki=17.1 nM) and group A PAK1 (Ki=13.7 nM)[1]. PF-3758309 dihydrochloride is known to suppress anchorage-independent growth of a panel of tumor cell lines (IC50=4.7 nM) as well as phosphorylation of the PAK4 substrate GEF-H1 (IC50=1.3 nM) in cells[1]. Additionally, in HCT116 cells, PF-3758309 dihydrochloride prevents endogenous pGEF-H1 accumulation. PF-3758309 effectively suppresses A549 cell growth that is anchorage-independent (IC50=27 nM) and proliferation (IC50=20 nM)[1].
ln Vivo	In HCT116 and A549 models, PF-3758309 dihydrochloride (7.5-30 mg/kg; po; twice daily for 9–18 days) causes a statistically significant tumor growth inhibition (TGI)[1].
Animal Protocol	Animal/Disease Models: Female nu/nu, CRL breed 6–8 weeks old mice (bearing HCT116 and A549 tumors)[1] Doses: 7.5-30 mg/kg Route of Administration: Oral administration; twice (two times) daily for 9-18 days Experimental Results: Significant tumor growth inhibition (TGI) in HCT116 and A549 models.
References	[1]. Small-molecule p21-activated kinase inhibitor PF3758309 is a potent inhibitor of oncogenic signaling and tumor growth. Proceedings of the National Academy of Sciences of the United States of America (2010), 107(20), 9446-9451, S94. [2]. Do PAKs make good drug targets? F1000 Biol Rep. 2010 Sep 23;2:70. [3]. PF-3758309, p21-activated kinase 4 inhibitor, suppresses migration and invasion of A549 human lung cancer cells via regulation of CREB, NF-κB, and β-catenin signalings. Mol Cell Biochem. 2014 Apr;389(1-2):69-77.

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	1.7745 mL	8.8723 mL	17.7447 mL
	5 mM	0.3549 mL	1.7745 mL	3.5489 mL
	10 mM	0.1774 mL	0.8872 mL	1.7745 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.