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StemRegenin 1 (SR1)

Catalog No.
AhR antagonist
Grouped product items
SizePriceStock Qty
10mM (in 1mL DMSO)
In stock
Evaluation Sample
In stock
In stock
In stock
In stock
In stock

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StemRegenin 1 (SR1), a purine derivative, is a potent small molecule inhibitor of aryl hydrocarbon receptor (AhR) that potently antagonizes AhR with a value of 50% inhibition concentration IC50 of 127 nM in CD34+ cells. SR1 has been found to promote the ex vivo expansion of CD34+ cells. Recent study results have suggested that culture of hematopoietic stem cells (HSC) with SR1 increases cells expressing CD34 by fifty-fold and increases cells retaining the ability to engraft immunodeficient mice by 17-fold. SR1 has also been found to induce the ex vivo differentiation of pDCs, BDCA1+ and BDCA3+ mDCs as well as the generation of high numbers of all these DC subsets.


Thordardottir S, Hangalapura BN, Hutten T, Cossu M, Spanholtz J, Schaap N, Radstake TR, Vandervoort R, Dolstra H. The aryl hydrocarbon receptor antagonist StemRegenin 1 promotes human plasmacytoid and myeloid dendritic cell development from CD34+ hematopoietic progenitor cells. Stem Cells Dev. 2013 Dec 10. [Epub ahead of print]

Boitano AE, Wang J, Romeo R, Bouchez LC, Parker AE, Sutton SE, Walker JR, Flaveny CA, Perdew GH, Denison MS, Schultz PG, Cooke MP. Aryl hydrocarbon receptor antagonists promote the expansion of human hematopoietic stem cells. Science. 2010 Sep 10;329(5997):1345-8. doi: 10.1126/science.1191536. Epub 2010 Aug 5.

Chemical Properties

Physical AppearanceA solid
StorageStore at -20°C
Cas No.1227633-49-9
Solubility≥21.5mg/mL in DMSO, ≥3.41 mg/mL in EtOH with ultrasonic,insoluble in H2O
Chemical Name4-[2-[[2-(1-benzothiophen-3-yl)-9-propan-2-ylpurin-6-yl]amino]ethyl]phenol
SDFDownload SDF
Shipping ConditionEvaluation sample solution: ship with blue ice. All other available sizes: ship with RT, or blue ice upon request.
General tipsFor obtaining a higher solubility, please warm the tube at 37°C and shake it in the ultrasonic bath for a while. Stock solution can be stored below -20°C for several months.


Cell experiment: [1]

Cell lines

CD34+UCB cells

Preparation method

The solubility of this compound in DMSO is >10 mM. General tips for obtaining a higher concentration: Please warm the tube at 37 °C for 10 minutes and/or shake it in the ultrasonic bath for a while.Stock solution can be stored below -20°C for several months.

Reaction Conditions

1 μM, 3 weeks


CD34+UCB cells were cultured for 3 weeks with 1μM SR1 or 0.01% DMSO (control). Total cell number was determined at day 7, 14, and 21 and the frequency of pDCs was evaluated at each time point by flow cytometry. During the 3-weeks culture period the total nucleated cells continuously expanded. Analysis of pDC differentiation in time revealed that the maximum frequency of pDCs was already reached at day 14. However, the absolute number of pDCs was highest on day 21.

Animal experiment:

Other notes

Please test the solubility of all compounds indoor, and the actual solubility may slightly differ with the theoretical value. This is caused by an experimental system error and it is normal.


[1] Thordardottir S, Hangalapura B N, Hutten T, et al. The Aryl Hydrocarbon Receptor Antagonist StemRegenin 1 Promotes Human Plasmacytoid and Myeloid Dendritic Cell Development from CD34+ Hematopoietic Progenitor Cells. Stem cells and development, 2013, 23(9): 955-967.

Biological Activity

Description StemRegenin 1 is an inhibitor of AhR with IC50 of 127 nM.
Targets AhR          
IC50 127 nM          

Quality Control

Chemical structure

StemRegenin 1 (SR1)

Related Biological Data

StemRegenin 1 (SR1)

Related Biological Data

StemRegenin 1 (SR1)