Tigapotide (PCK-3145) is an antitumor peptide that reduces the development of skeletal metastases associated with prostate cancer. Tigapotide can induce tumor cell apoptosis and reduce tumor parathyroid hormone-related peptide (PTHrP) levels.

Physicochemical Properties

Molecular Formula	C82H119N21O34S3
Molecular Weight	2039.13757634163
Exact Mass	2037.74
CAS #	848084-83-3
Related CAS #	848084-84-4 (triflutate); 848084-83-3;
PubChem CID	16155604
Appearance	Typically exists as solid at room temperature
LogP	-12.1
Hydrogen Bond Donor Count	31
Hydrogen Bond Acceptor Count	38
Rotatable Bond Count	65
Heavy Atom Count	140
Complexity	4350
Defined Atom Stereocenter Count	19
SMILES	C[C@H]([C@@H](C(=O)N[C@@H](CC(=O)O)C(=O)N[C@@H](CC(=O)N)C(=O)N[C@@H](CSCNC(=O)C)C(=O)N[C@@H](CCC(=O)O)C(=O)N[C@@H]([C@@H](C)O)C(=O)N[C@@H](CSCNC(=O)C)C(=O)N[C@@H]([C@@H](C)O)C(=O)N[C@@H](CSCNC(=O)C)C(=O)N[C@@H](CC1=CC=C(C=C1)O)C(=O)N[C@@H](CCC(=O)O)C(=O)N[C@@H]([C@@H](C)O)C(=O)O)NC(=O)[C@H](CCC(=O)N)NC(=O)[C@H](CC2=CNC3=CC=CC=C32)NC(=O)[C@H](CCC(=O)O)N)O
InChi Key	ZRXXHPDJLAQCPC-SFJRRRFZSA-N
InChi Code	InChI=1S/C82H119N21O34S3/c1-35(104)64(100-69(123)48(17-20-58(84)112)90-73(127)52(93-68(122)46(83)16-21-60(114)115)25-43-28-86-47-11-9-8-10-45(43)47)79(133)96-54(27-63(120)121)75(129)95-53(26-59(85)113)74(128)97-55(29-138-32-87-39(5)108)76(130)92-49(18-22-61(116)117)70(124)101-65(36(2)105)80(134)99-57(31-140-34-89-41(7)110)78(132)102-66(37(3)106)81(135)98-56(30-139-33-88-40(6)109)77(131)94-51(24-42-12-14-44(111)15-13-42)72(126)91-50(19-23-62(118)119)71(125)103-67(38(4)107)82(136)137/h8-15,28,35-38,46,48-57,64-67,86,104-107,111H,16-27,29-34,83H2,1-7H3,(H2,84,112)(H2,85,113)(H,87,108)(H,88,109)(H,89,110)(H,90,127)(H,91,126)(H,92,130)(H,93,122)(H,94,131)(H,95,129)(H,96,133)(H,97,128)(H,98,135)(H,99,134)(H,100,123)(H,101,124)(H,102,132)(H,103,125)(H,114,115)(H,116,117)(H,118,119)(H,120,121)(H,136,137)/t35-,36-,37-,38-,46+,48+,49+,50+,51+,52+,53+,54+,55+,56+,57+,64+,65+,66+,67+/m1/s1
Chemical Name	(4S)-5-[[(2S)-1-[[(2S)-1-[[(2S,3R)-1-[[(2S)-1-[[(2S)-1-[[(2R)-3-(acetamidomethylsulfanyl)-1-[[(2S)-1-[[(2S,3R)-1-[[(2R)-3-(acetamidomethylsulfanyl)-1-[[(2S,3R)-1-[[(2R)-3-(acetamidomethylsulfanyl)-1-[[(2S)-1-[[(2S)-4-carboxy-1-[[(1S,2R)-1-carboxy-2-hydroxypropyl]amino]-1-oxobutan-2-yl]amino]-3-(4-hydroxyphenyl)-1-oxopropan-2-yl]amino]-1-oxopropan-2-yl]amino]-3-hydroxy-1-oxobutan-2-yl]amino]-1-oxopropan-2-yl]amino]-3-hydroxy-1-oxobutan-2-yl]amino]-4-carboxy-1-oxobutan-2-yl]amino]-1-oxopropan-2-yl]amino]-4-amino-1,4-dioxobutan-2-yl]amino]-3-carboxy-1-oxopropan-2-yl]amino]-3-hydroxy-1-oxobutan-2-yl]amino]-5-amino-1,5-dioxopentan-2-yl]amino]-3-(1H-indol-3-yl)-1-oxopropan-2-yl]amino]-4-amino-5-oxopentanoic acid
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

ADME/Pharmacokinetics	Biological Half-Life 0.35 hours to 1.45 hours
References	[1]. Pippa N, et al. Advanced nanocarriers for an antitumor peptide. Journal of nanoparticle research, 2013, 15(11): 1-13.
Additional Infomation	Tigapotide is a synthetic 15-mer peptide that is derived from the natural sequence of amino acids of the prostate secretory protein (PSP94), one of three predominant proteins found in human seminal fluid. Tigapotide is a synthetic 15-mer peptide corresponding to amino acids 31-45 of the 94-amino acid isoform of human prostate secretory protein (PSP-94) with potential anti-metastasis and anti-angiogenesis activities. PSP-94-derived peptide PCK3145 may inhibit the secretion of the metastasis-related protein matrix metalloproteinase-9 (MMP-9) and its potential binding to its cell surface receptor CD44; may interfere with the vascular endothelial growth factor (VEGF) signaling pathway, resulting in an anti-angiogenesis effect; and may reduce the levels of parathyroid hormone-related protein (PTHrP), decreasing plasma calcium levels. PSP-94, one of three predominant proteins found in seminal fluid, may be down-regulated in prostate cancer, representing a potential survival mechanism for prostate cancer cells. MMP-9 is implicated in the invasion and metastasis of cancer. PTHrP may be expressed by various tumor cell types, resulting in the hypercalcemia of malignancy. Drug Indication For the treatment of late stage Hormone Refractory Prostate Cancer (HRPC) for which no effective therapy currently exists. Mechanism of Action The mechanism of action and receptor for PCK3145 suggests PCK3145 to be a signal transduction inhibitor with multiple ways (apoptosis, anti-angiogenesis and anti-metastasis) to restrict disease development. Pharmacodynamics PCK3145 is a synthetic 15-mer peptide that is derived from the natural sequence of amino acids of the prostate secretory protein (PSP94), one of three predominant proteins found in human seminal fluid. PSP94 expression in the prostate is down regulated in patients with advanced prostate cancer, and believed to be a survival mechanism for the cancer cells. Results from an earlier trial conducted in the U.K. showed PCK3145 to be safe and well tolerated at all doses tested and further suggest that it also plays a role in preventing the metastatic process as measured by its effect on MMP-9 levels, a Gelatinase B enzyme involved in angiogenesis, tumor invasion and metastasis.

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	0.4904 mL	2.4520 mL	4.9040 mL
	5 mM	0.0981 mL	0.4904 mL	0.9808 mL
	10 mM	0.0490 mL	0.2452 mL	0.4904 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.