Name: Stemregenin 1 (SR1)
Brand: Selleck Chemicals
SKU: S2858
Rating: 5 (51 reviews)

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Quality Control

Batch: Purity: 99.96%

99.96

Related Targets	Dehydrogenase HSP Transferase P450 (e.g. CYP17) PDE phosphatase PPAR Vitamin Carbohydrate Metabolism Mitochondrial Metabolism
Other AhR Inhibitors	BAY 2416964 CH-223191 BAY-218 FICZ Tapinarof Diosmin Norisoboldine L-Kynurenine PDM2 CAY10465

Cell Culture, Treatment & Working Concentration

Cell Lines	Assay Type	Activity Description	PMID
CD34+	Function assay	Ex vivo expansion of human CD34+ cells assessed as increase in CD34+ cell level after 5 to 7 days by confocal microscopy, EC50=0.12μM	31035239
DAOY	qHTS assay	qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for DAOY cells	29435139
A673	qHTS assay	qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for A673 cells	29435139
SK-N-MC	qHTS assay	qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for SK-N-MC cells	29435139
Saos-2	qHTS assay	qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for Saos-2 cells	29435139
SK-N-SH	qHTS assay	qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for SK-N-SH cells	29435139
NB1643	qHTS assay	qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for NB1643 cells	29435139
RD	qHTS assay	qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for RD cells	29435139
MG 63 (6-TG R)	qHTS assay	qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for MG 63 (6-TG R) cells	29435139
Rh30	qHTS assay	qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for Rh30 cells	29435139
Rh41	qHTS assay	qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for Rh41 cells	29435139
Click to View More Cell Line Experimental Data

Chemical Information, Storage & Stability

Molecular Weight	429.54	Formula	C₂₄H₂₃N₅OS	Storage (From the date of receipt)	3 years-20°Cpowder
CAS No.	1227633-49-9	Download SDF		Storage of Stock Solutions	1 year-80°Cin solvent 1 month-20°Cin solvent
Synonyms	N/A			Smiles	CC(C)N1C=NC2=C(N=C(N=C21)C3=CSC4=CC=CC=C43)NCCC5=CC=C(C=C5)O

Solubility

In vitro
Batch:

DMSO : 86 mg/mL (200.21 mM)
(Moisture-contaminated DMSO may reduce solubility. Use fresh, anhydrous DMSO.)

Water : Insoluble

Ethanol : 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.
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.	1.000mg/ml (2.33mM)	Taking the 1 mL working solution as an example, add 50 μL of 20 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.
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.
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.
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	Aryl hydrocarbon receptor (AhR) (Cell-free assay) 127 nM
In vitro	StemRegenin 1 (SR1) increases the number of CD34+ cells after 5 to 7 days with an EC50 of 120 nM. Culture of mPB CD34+ cells with cytokines plus this compound (1 µM) for 7 days increases the number of CD34+, CD133+, and CD90+ hematopoietic stem and progenitor cell populations 2.6-, 2.3-, and 10-fold, respectively compared to control cells. Continued culture with it (1 µM) for 3 weeks leads to an 11-fold increase in total nucleated cells (TNC), a 73-fold increase in CD34+ cells as compared to control cultures, and a 1118-fold increase in CD34+ cells relative to input cells. Culture of 1×10³ cord blood CD34+ cells for 5 weeks with SR1 (1 µM) results in the production of 1.69×10⁶ colony forming cells. It induces CD34+ cell expansion by binding and antagonizing AhR as evident by decreased CYP1B1 and AHRR mRNA levels. Treatment with this compound (1 µM) accelerates the proliferation of CD34+ cells and decreased the expression levels of VentX in human CD34+ cells. Ectopic expression of VentX prevents SR1-induced expansion of CD34+ cells. Sequential coculture with bone morphogenetic protein 4 (20 ng/mL), PGE2 (2 µM), and it (0.75 µM) lead to robust Macaca nemestrina iPSC hematopoietic progenitor cell formation. CD34(+)CD38(-)Thy1(+)CD45RA(-)CD49f(+) cells isolated on the basis of CD34 expression and cultured in SR1 (0.75 µM) expands 3-fold and maintained this long-term repopulating HSC phenotype.
Kinase Assay	AhR ligand binding assay
Kinase Assay	Mouse livers are homogenised in buffer (25 mM MOPS, 2 mM EDTA, 0.02% NaN3, and 10% glycerol, pH 7.4) containing 20 mM sodium molybdate and protease inhibitors and centrifuged at 100,000g for 1 h. Lysates treated with SR1 (StemRegenin 1) are incubated at room temperature for 20 min and then photolysed at 8 cm with 402 nm UV light. Dextran-coated charcoal (1%) is added to the photolysed samples, which are then centrifuged at 3000g for 10 min to remove free ligand. Labelled samples are resolved using 8% acrylamide-tricine-SDS-PAGE, transferred to PVDF membrane, and visualised using autoradiography. Labelled AHR bands are excised and counted using a γ counter.
In vivo	StemRegenin 1 (SR1) promotes expansion of CB CD34+ cells that contribute to both early and sustained engraftment NOD.Cg-Prkdcscid Il2rgtm1Wjl/SzJ (NSG) mice.
References	[1] https://pubmed.ncbi.nlm.nih.gov/20688981/ [2] https://pubmed.ncbi.nlm.nih.gov/22791709/ [3] https://pubmed.ncbi.nlm.nih.gov/22898598/

Clinical Trial Information

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

NCT Number	Recruitment	Conditions	Sponsor/Collaborators	Start Date	Phases
NCT00763555	Completed	Psoriasis	Galderma R&D	September 2008	Phase 2

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Stemregenin 1 (SR1) AhR antagonist

Chemical Structure

Molecular Weight: 429.54