ATN-161 free base
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MedKoo CAT#: 200350

CAS#: 262438-43-7 (free base)

Description: ATN-161 is a small peptide antagonist of integrin alpha5beta1 with potential antineoplastic activity. ATN-161 selectively binds to and blocks the receptor for integrin alpha5beta1, thereby preventing integrin alpha5beta1 binding. This receptor blockade may result in inhibition of endothelial cell-cell interactions, endothelial cell-matrix interactions, angiogenesis, and tumor progression. Integrin alpha5beta1 is expressed on endothelial cells and plays a crucial role in endothelial cell adhesion and migration.


Chemical Structure

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ATN-161 free base
CAS# 262438-43-7 (free base)

Theoretical Analysis

MedKoo Cat#: 200350
Name: ATN-161 free base
CAS#: 262438-43-7 (free base)
Chemical Formula: C23H35N9O8S
Exact Mass:
Molecular Weight: 597.64
Elemental Analysis: C, 46.22; H, 5.90; N, 21.09; O, 21.42; S, 5.36

Price and Availability

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5.0mg USD 90.0 Same Day
10.0mg USD 150.0 Same Day
25.0mg USD 250.0 Same Day
50.0mg USD 450.0 Same Day
100.0mg USD 750.0 Same Day
200.0mg USD 1150.0 Same Day
500.0mg USD 2450.0 Same Day
1.0g USD 3450.0 Same Day
2.0g USD 5850.0 Same Day
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Related CAS #: 262438-43-7 (free base)   904763-27-5 (TFA)   904763-42-4 (HCl)   904763-50-4 (mesylate)   904763-58-2 (acetate)   904763-74-2 (sulfate)  

Synonym: ATN161; ATN 161; ATN-161; AcPHSCNNH2

IUPAC/Chemical Name: (S)-2-((R)-2-((S)-2-((S)-2-((S)-1-acetylpyrrolidine-2-carboxamido)-3-(1H-imidazol-5-yl)propanamido)-3-hydroxypropanamido)-3-mercaptopropanamido)succinamide

InChi Key: MMHDBUJXLOFTLC-WOYTXXSLSA-N

InChi Code: InChI=1S/C23H35N9O8S/c1-11(34)32-4-2-3-17(32)23(40)29-14(5-12-7-26-10-27-12)20(37)30-15(8-33)21(38)31-16(9-41)22(39)28-13(19(25)36)6-18(24)35/h7,10,13-17,33,41H,2-6,8-9H2,1H3,(H2,24,35)(H2,25,36)(H,26,27)(H,28,39)(H,29,40)(H,30,37)(H,31,38)/t13-,14-,15-,16-,17-/m0/s1

SMILES Code: O=C(N)[C@@H](NC([C@@H](NC([C@@H](NC([C@@H](NC([C@H]1N(C(C)=O)CCC1)=O)CC2=CN=CN2)=O)CO)=O)CS)=O)CC(N)=O

Appearance: white solid powder

Purity: >98% (or refer to the Certificate of Analysis)

Shipping Condition: Shipped under ambient temperature as non-hazardous chemical. This product is stable enough for a few weeks during ordinary shipping and time spent in Customs.

Storage Condition: Dry, dark and at 0 - 4 C for short term (days to weeks) or -20 C for long term (months to years).

Solubility: Soluble in DMSO, soluble in water

Shelf Life: >2 years if stored properly

Drug Formulation: This drug may be formulated in DMSO

Stock Solution Storage: 0 - 4 C for short term (days to weeks), or -20 C for long term (months).

HS Tariff Code: 2934.99.9001

Biological target: Integrin α5β1 antagonist.
In vitro activity: The binding of the SARS-CoV-2 spike protein with ACE2 and α5β1 was explored using ELISA-based methods. To determine the spike protein’s ability to bind α5β1, plates were coated with α5β1 and incubated with a mixture of ATN-161 and a trimeric version of the spike protein. The SARS-CoV-2 spike protein was bound to α5β1 with an affinity that was roughly equivalent to α5β1’s native ligand, fibronectin, and inhibited binding with a U-shaped, dose-dependent manner, with maximum effect at 100 nM (Figure 1A). This U-shaped response was not surprising because it was consistent with previous in vitro and in vivo studies on ATN-161 in the context of blocking angiogenesis and solid tumor growth. This might be due to the ability of ATN-161, at saturating concentrations, to affect the expression of α5β1 integrin, which was demonstrated to occur in experimental stroke. Reference: JACC Basic Transl Sci. 2021 Jan;6(1):1-8. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7566794/
In vivo activity: Following tandem transient common carotid artery/middle cerebral artery occlusion on wild-type mice, the integrin a5b1 inhibitor, ATN-161, was administered by intraperitoneal (IP) injection at 1 mg/kg acutely after reperfusion, on post-stroke day (PSD)1 and PSD2. Systemic changes (heart rate, pulse distension, and body temperature) were determined. Additionally, infarct volume and edema were determined by 2,3-triphenyltetrazolium chloride and magnetic resonance imaging, while neurological changes were evaluated using an 11-point Neuroscore. Brain immunohistochemistry was performed for claudin-5, α5β1, IgG, and CD45 + cells, and quantitative polymerase chain reaction (qPCR) was performed for matrix metalloproteinase-9 (MMP-9), interleukin (IL)-1β, collagen IV, and CXCL12. ATN-161 significantly reduced integrin α5β1 expression in the surrounding peri-infarct region with no systemic changes. Infarct volume, edema, and functional deficit were significantly reduced in ATN-161-treated mice. Furthermore, ATN-161 treatment reduced IgG extravasation into the parenchyma through conserved claudin-5, collagen IV, CXCL12 while reducing MMP-9 transcription. Additionally, IL-1β and CD45 + cells were reduced in the ipsilateral cortex following ATN-161 administration. Reference: J Cereb Blood Flow Metab. 2020 Aug;40(8):1695-1708. https://pubmed.ncbi.nlm.nih.gov/33102950/

Solubility Data

Solvent Max Conc. mg/mL Max Conc. mM
Solubility
Water 7.5 12.56

Preparing Stock Solutions

The following data is based on the product molecular weight 597.64 Batch specific molecular weights may vary from batch to batch due to the degree of hydration, which will affect the solvent volumes required to prepare stock solutions.

Recalculate based on batch purity %
Concentration / Solvent Volume / Mass 1 mg 5 mg 10 mg
1 mM 1.15 mL 5.76 mL 11.51 mL
5 mM 0.23 mL 1.15 mL 2.3 mL
10 mM 0.12 mL 0.58 mL 1.15 mL
50 mM 0.02 mL 0.12 mL 0.23 mL
Formulation protocol: 1. Beddingfield BJ, Iwanaga N, Chapagain PP, Zheng W, Roy CJ, Hu TY, Kolls JK, Bix GJ. The Integrin Binding Peptide, ATN-161, as a Novel Therapy for SARS-CoV-2 Infection. JACC Basic Transl Sci. 2021 Jan;6(1):1-8. doi: 10.1016/j.jacbts.2020.10.003. Epub 2020 Oct 16. PMID: 33102950; PMCID: PMC7566794. 2. Wang W, Wang F, Lu F, Xu S, Hu W, Huang J, Gu Q, Sun X. The antiangiogenic effects of integrin alpha5beta1 inhibitor (ATN-161) in vitro and in vivo. Invest Ophthalmol Vis Sci. 2011 Sep 14;52(10):7213-20. doi: 10.1167/iovs.10-7097. PMID: 21813636. 3. Edwards DN, Salmeron K, Lukins DE, Trout AL, Fraser JF, Bix GJ. Integrin α5β1 inhibition by ATN-161 reduces neuroinflammation and is neuroprotective in ischemic stroke. J Cereb Blood Flow Metab. 2020 Aug;40(8):1695-1708. doi: 10.1177/0271678X19880161. Epub 2019 Oct 1. PMID: 31575337; PMCID: PMC7370357. 4. Lv X, Li Z, Guan J, Zhang J, Xu B, He W, Lan Y, Zhao K, Lu H, Song D, Gao F. ATN-161 reduces virus proliferation in PHEV-infected mice by inhibiting the integrin α5β1-FAK signaling pathway. Vet Microbiol. 2019 Jun;233:147-153. doi: 10.1016/j.vetmic.2019.04.029. Epub 2019 Apr 26. PMID: 31176401.
In vitro protocol: 1. Beddingfield BJ, Iwanaga N, Chapagain PP, Zheng W, Roy CJ, Hu TY, Kolls JK, Bix GJ. The Integrin Binding Peptide, ATN-161, as a Novel Therapy for SARS-CoV-2 Infection. JACC Basic Transl Sci. 2021 Jan;6(1):1-8. doi: 10.1016/j.jacbts.2020.10.003. Epub 2020 Oct 16. PMID: 33102950; PMCID: PMC7566794. 2. Wang W, Wang F, Lu F, Xu S, Hu W, Huang J, Gu Q, Sun X. The antiangiogenic effects of integrin alpha5beta1 inhibitor (ATN-161) in vitro and in vivo. Invest Ophthalmol Vis Sci. 2011 Sep 14;52(10):7213-20. doi: 10.1167/iovs.10-7097. PMID: 21813636.
In vivo protocol: 1. Edwards DN, Salmeron K, Lukins DE, Trout AL, Fraser JF, Bix GJ. Integrin α5β1 inhibition by ATN-161 reduces neuroinflammation and is neuroprotective in ischemic stroke. J Cereb Blood Flow Metab. 2020 Aug;40(8):1695-1708. doi: 10.1177/0271678X19880161. Epub 2019 Oct 1. PMID: 31575337; PMCID: PMC7370357. 2. Lv X, Li Z, Guan J, Zhang J, Xu B, He W, Lan Y, Zhao K, Lu H, Song D, Gao F. ATN-161 reduces virus proliferation in PHEV-infected mice by inhibiting the integrin α5β1-FAK signaling pathway. Vet Microbiol. 2019 Jun;233:147-153. doi: 10.1016/j.vetmic.2019.04.029. Epub 2019 Apr 26. PMID: 31176401.

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1. Amruta N, Bix G. ATN-161 Ameliorates Ischemia/Reperfusion-induced Oxidative Stress, Fibro-inflammation, Mitochondrial damage, and Apoptosis-mediated Tight Junction Disruption in bEnd.3 Cells. Inflammation. 2021 Aug 22:1–18. doi: 10.1007/s10753-021-01509-9. Epub ahead of print. PMID: 34420157; PMCID: PMC8380192. 2. Amruta N, Engler-Chiurazzi EB, Murray-Brown IC, Gressett TE, Biose IJ, Chastain WH, Befeler JB, Bix G. In Vivo protection from SARS-CoV-2 infection by ATN-161 in k18-hACE2 transgenic mice. Life Sci. 2021 Aug 10;284:119881. doi: 10.1016/j.lfs.2021.119881. Epub ahead of print. PMID: 34389403; PMCID: PMC8352850.

1: Dai W, Yang T, Wang X, Wang J, Zhang X, Zhang Q. PHSCNK-Modified and doxorubicin-loaded liposomes as a dual targeting system to integrin-overexpressing tumor neovasculature and tumor cells. J Drug Target. 2010 May;18(4):254-63. PubMed PMID: 19824864.

2: Doñate F, Parry GC, Shaked Y, Hensley H, Guan X, Beck I, Tel-Tsur Z, Plunkett ML, Manuia M, Shaw DE, Kerbel RS, Mazar AP. Pharmacology of the novel antiangiogenic peptide ATN-161 (Ac-PHSCN-NH2): observation of a U-shaped dose-response curve in several preclinical models of angiogenesis and tumor growth. Clin Cancer Res. 2008 Apr 1;14(7):2137-44. PubMed PMID: 18381955.

3: Danese S, Sans M, Spencer DM, Beck I, Doñate F, Plunkett ML, de la Motte C, Redline R, Shaw DE, Levine AD, Mazar AP, Fiocchi C. Angiogenesis blockade as a new therapeutic approach to experimental colitis. Gut. 2007 Jun;56(6):855-62. Epub 2006 Dec 14. PubMed PMID: 17170016.

4: Chidlow JH Jr, Langston W, Greer JJ, Ostanin D, Abdelbaqi M, Houghton J, Senthilkumar A, Shukla D, Mazar AP, Grisham MB, Kevil CG. Differential angiogenic regulation of experimental colitis. Am J Pathol. 2006 Dec;169(6):2014-30. PubMed PMID: 17148665; PubMed Central PMCID: PMC1762465.

5: Khalili P, Arakelian A, Chen G, Plunkett ML, Beck I, Parry GC, Doñate F, Shaw DE, Mazar AP, Rabbani SA. A non-RGD-based integrin binding peptide (ATN-161) blocks breast cancer growth and metastasis in vivo. Mol Cancer Ther. 2006 Sep;5(9):2271-80. PubMed PMID: 16985061.

6: Cianfrocca ME, Kimmel KA, Gallo J, Cardoso T, Brown MM, Hudes G, Lewis N, Weiner L, Lam GN, Brown SC, Shaw DE, Mazar AP, Cohen RB. Phase 1 trial of the antiangiogenic peptide ATN-161 (Ac-PHSCN-NH(2)), a beta integrin antagonist, in patients with solid tumours. Br J Cancer. 2006 Jun 5;94(11):1621-6. PubMed PMID: 16705310; PubMed Central PMCID: PMC2361324.

7: Stoeltzing O, Liu W, Reinmuth N, Fan F, Parry GC, Parikh AA, McCarty MF, Bucana CD, Mazar AP, Ellis LM. Inhibition of integrin alpha5beta1 function with a small peptide (ATN-161) plus continuous 5-FU infusion reduces colorectal liver metastases and improves survival in mice. Int J Cancer. 2003 Apr 20;104(4):496-503. PubMed PMID: 12584749.

 



Additional Information

Note: The original catalog number for this product was 200350a.