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Reparixin (Repertaxin) CXCR inhibitor

Name: Reparixin (Repertaxin)
Brand: Selleck Chemicals
SKU: S8640
Rating: 5 (24 reviews)

Cat.No.S8640

Reparixin (Repertaxin, DF 1681Y) is a potent and specific inhibitor of CXCR1 with IC50 of 1 nM. It inhibits PMN migration induced by CXCL8 (IC50 = 1 nM) and rodent PMN chemotaxis induced by CXCL1 and CXCL2. This compound also inhibits the response of human PMN to CXCL1, which interacts with CXCR2 (IC50 = 400 nM).

Chemical Structure

Molecular Weight: 283.39

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Quality Control

Batch: Purity: 99.98%

99.98

Related Targets	PD-1/PD-L1 STING AhR Immunology & Inflammation related CD markers Interleukins Anti-infection Antioxidant COX Histamine Receptor
Other CXCR Inhibitors	AZD5069 SB 225002 WZ811 Navarixin (SCH-527123) LIT-927 AMG 487 SX-682 LY2510924 Danirixin (GSK1325756) SB 265610

Cell Culture, Treatment & Working Concentration

Cell Lines	Assay Type	Concentration	Activity Description	PMID
polymorphonuclear cells	Function assay		Inhibition of CXCL8-induced chemotaxis in human polymorphonuclear cells, IC50=0.0053μM	15974585
L1.2	Function assay		Inhibition of CXCL8-induced cell migration in L1.2 cells expressing CXCR1 by chemotaxis assay, IC50=0.0056μM	17665889
L1.2	Function assay		Inhibition of CXCL8-induced cell migration in L1.2 cells expressing Ile43Val CXCR1 mutant by chemotaxis assay, IC50=0.08μM	17665889
L1.2	Function assay	up to 1000 nM	Inhibition of CXCL8-induced cell migration in L1.2 cells expressing wild type CXCR1 at up to 1000 nM by chemotaxis assay	17665889
Click to View More Cell Line Experimental Data

Chemical Information, Storage & Stability

Molecular Weight	283.39	Formula	C₁₄H₂₁NO₃S	Storage (From the date of receipt)	3 years-20°Cpowder
CAS No.	266359-83-5	Download SDF		Storage of Stock Solutions	1 year-80°Cin solvent 1 month-20°Cin solvent
Synonyms	DF 1681Y			Smiles	CC(C)CC1=CC=C(C=C1)C(C)C(=O)NS(=O)(=O)C

Solubility

In vitro
Batch:

DMSO : 100 mg/mL (352.87 mM)
(Moisture-contaminated DMSO may reduce solubility. Use fresh, anhydrous DMSO.)

Ethanol : 57 mg/mL

Water : Insoluble

Molarity Calculator

Mass	Concentration	Volume	Molecular Weight
=	×	×

Dilution Calculator Molecular Weight Calculator

In vivo Batch:
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Clear solution	5%DMSO 1 40%PEG300 2 5%Tween80 3 50%ddH2O Validated by Selleck labs. Should you need adjustments to this formulation, contact our sales team for custom testing.	5.000mg/ml (17.64mM)	Taking the 1 mL working solution as an example, add 50 μL of 100 mg/ml clarified DMSO stock solution to 400 μL of PEG300, mix evenly to clarify it; add 50 μL of Tween80 to the above system, mix evenly to clarify; then continue to add 500 μL of ddH2O to adjust the volume to 1 mL. The mixed solution should be used immediately for optimal results.
Clear solution	5% DMSO 1 95% Corn oil Validated by Selleck labs. Should you need adjustments to this formulation, contact our sales team for custom testing.	1.650mg/ml (5.82mM)	Taking the 1 mL working solution as an example, add 50 μL of 33 mg/ml clear DMSO stock solution to 950 μL of corn oil and mix evenly. The mixed solution should be used immediately for optimal results.
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.

In vivo Formulation Calculator (Clear solution)

Step 1: Enter information below (Recommended: An additional animal making an allowance for loss during the experiment)

Dosage: mg/kg Average weight of animals: g Dosing volume per animal:μL Number of animals:

Step 2: Enter the in vivo formulation (This is only the calculator, not formulation. Please contact us first if there is no in vivo formulation at the solubility Section.)

% DMSO + % + % Tween 80 + % ddH₂O

%DMSO+ %

Calculation results:

Working concentration: mg/ml;

Method for preparing DMSO master liquid: mg drug pre-dissolved in μL DMSO ( Master liquid concentration mg/mL, Please contact us first if the concentration exceeds the DMSO solubility of the batch of drug. )

Method for preparing in vivo formulation: Take μL DMSO master liquid, next addμL PEG300, mix and clarify, next addμL Tween 80, mix and clarify, next add μL ddH₂O, mix and clarify.

Method for preparing in vivo formulation: Take μL DMSO master liquid, next add μL Corn oil, mix and clarify.

Note: 1. Please make sure the liquid is clear before adding the next solvent.
2. Be sure to add the solvent(s) in order. You must ensure that the solution obtained, in the previous addition, is a clear solution before proceeding to add the next solvent. Physical methods such as vortex, ultrasound or hot water bath can be used to aid dissolving.

Mechanism of Action

Targets/IC₅₀/Ki	CXCR1 (Cell-free assay) 1 nM CXCL8 (Cell-free assay) 1 nM CXCR2 (Cell-free assay) 400 nM
In vitro	Reparixin (Repertaxin) is a non-competitive allosteric blocker of CXCR1 and CXCR2 receptor activation, which inhibits intracellular signal pathways without affecting receptor bindings. It potently and selectively inhibits a wide range of biological activities that are induced by CXCL8 such as leukocytes recruitment and functional inflammatory reactions. However, this compound does not affect CXCR1/CXCR2 activation induced by other chemotactic factors, C5a, fMLP, CXCL12 or several other agonists of GPCRs. It can regulate the production of angiotensin II receptors, which may influence Ang II-induced hypertension. Reparixin specifically blocks CXCR1/2-mediated mouse and human neutrophil migration in vitro without affecting other receptors. The compound inhibits CXCL8-induced neutrophil activation through human CXCR1 and human CXCR2 and blocks phosphorylation of downstream signalling molecules. It prevents the increase of intracellular free calcium, elastase release and production of reactive oxygen intermediates, but leaves phagocytosis of Escherichia coli bacteria unaffected.
In vivo	Reparixin (Repertaxin), an inhibitor of CXCL8 receptor CXCR1 and CXCR2 activation, attenuates inflammatory responses in various injury models. It effectively decreases systolic blood pressure and increases the blood flow. The thoracic aorta wall thickness is significantly decreased in SHR-R (the reparixin-treated group) compared to SHR-N (normal saline-treated SHR). (SHR: Spontaneously hypertensive rats)
References	[1] https://pubmed.ncbi.nlm.nih.gov/21212529/ [2] https://pubmed.ncbi.nlm.nih.gov/18587419/ [3] https://pubmed.ncbi.nlm.nih.gov/15282370/

Applications

Methods	Biomarkers	Images	PMID
Western blot	IL-8 / STAT3 / p-STAT3 / AKT / p-AKT CXCR1 / CACR2 / Bcl-2 / Bax / Cyclin D1 / VEGF / MMP-2 / MMP-9 / TIMP-2 / E-cadherin / p-ERK / ERK		30397072
Immunofluorescence	p-FAK / p-AKT / FOXO3A		20051626

Clinical Trial Information

(data from https://clinicaltrials.gov, updated on 2024-05-22)

NCT Number	Recruitment	Conditions	Sponsor/Collaborators	Start Date	Phases
NCT05835466	Recruiting	Myelofibrosis (PMF)\|Post Essential Thrombocythemia Myelofibrosis (ET-MF)\|Post Polycythemia Vera Related Myelofibrosis (PV-MF)	Icahn School of Medicine at Mount Sinai\|Dompé Farmaceutici S.p.A	June 27 2023	Phase 2
NCT05496868	Recruiting	Acute Respiratory Distress Syndrome Adult	Dompé Farmaceutici S.p.A	February 7 2023	Phase 2
NCT01861054	Terminated	Breast Cancer	Dompé Farmaceutici S.p.A	February 2013	Phase 2

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Handling Instructions

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Frequently Asked Questions

Question 1:
Do you have the information of the half life time of it Catalog No.S8640 in rats?

Answer:
The following paper indicated that its half-life in rats is 0.5h (http://jpet.aspetjournals.org/content/322/3/973).

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