Name: SR1 (StemRegenin 1)
Brand: Selleck Chemicals
SKU: S2858
Rating: 5 (39 reviews)

SR1 (StemRegenin 1) is an aryl hydrocarbon receptor (AhR) inhibitor with IC50 of 127 nM in a cell-free assay.

SR1 (StemRegenin 1) Chemical Structure

CAS: 1227633-49-9

Selleck's SR1 (StemRegenin 1) has been cited by 39 publications

Purity & Quality Control

Batch: Purity: 99.96%

99.96

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Cell Data

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

Biological Activity

Description

SR1 (StemRegenin 1) is an aryl hydrocarbon receptor (AhR) inhibitor with IC50 of 127 nM in a cell-free assay.

Targets

Aryl hydrocarbon receptor (AhR) ^[1]
(Cell-free assay)

127 nM

In vitro
In vitro	StemRegenin 1 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 SR1 (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 SR1 (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. SR1-induces CD34+ cell expansion acts by binding and antagonizing AhR as evident by decreased CYP1B1 and AHRR mRNA levels. ^[1] SR1 (1 μM) treatment 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. ^[2] Sequential coculture with bone morphogenetic protein 4 (20 ng/mL), PGE2 (2 μM), and SR1 (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. ^[3]
Kinase Assay	AhR ligand binding assay
Kinase Assay	Mouse livers are homogenized 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. ligand-treated lysates are incubated at room temperature for 20 min and then photolyzes at 8 cm with 402 nm UV light. Dextran-coated charcoal (1%) is added to the photolyzed samples, which are then centrifuged at 3000g for 10 min to remove free ligand. Labeled samples are resolved using 8% acrylamide-tricine-SDS-PAGE, transferred to PVDF membrane, and visualized using autoradiography. Labeled AHR bands are excised and counted using a γ counter.

In Vivo
In vivo	SR1 promotes expansion of CB CD34+ cells that contribute to both early and sustained engraftment NOD.Cg-Prkdcscid Il2rgtm1Wjl/SzJ (NSG) mice. ^[1]

NCT Number	Recruitment	Conditions	Sponsor/Collaborators	Start Date	Phases
Clinical Trial Information (data from https://clinicaltrials.gov, updated on 2024-01-11)
NCT00763555	Completed	Psoriasis	Galderma R&D	September 2008	Phase 2

References

Chemical Information & Solubility

Molecular Weight	429.54	Formula	C₂₄H₂₃N₅OS
CAS No.	1227633-49-9	SDF	Download SR1 (StemRegenin 1) SDF
Smiles	CC(C)N1C=NC2=C(N=C(N=C21)C3=CSC4=CC=CC=C43)NCCC5=CC=C(C=C5)O
Storage (From the date of receipt)	3 years-20°Cpowder	Storage of Stock Solutions Aliquot the stock solutions to avoid repeated freeze-thaw cycles	1 year-80°Cin solvent
Storage (From the date of receipt)	3 years-20°Cpowder		1 month-20°Cin solvent

In vitro
Batch:

DMSO : 86 mg/mL ( (200.21 mM)； Moisture-absorbing DMSO reduces solubility. Please use fresh DMSO.)

Water : Insoluble

Ethanol : Insoluble

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In vivo
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Tech Support

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