StemRegenin1 (SR1) --- HSC Expansion Molecule

Catalog No. size PriceQuantity
M60001-2S 2 mg solid $99
M60001-10S 10mg solid $396


StemRegenin1 (SR1) is a selective, cell-permeable antagonist of aryl hydrocarbon receptor. It can promote robust expansion and self-renewal of human CD34+ peripheral blood and cord blood hematopoietic stem cells (HSCs, EC50 ~120 nM). SR1 expanded CD34+ cells from bone marrow of humans, monkeys and dogs, but not mice. Culture of HSCs with 1 µM SR1 for 21 days led to a 50-fold increase in cells expressing CD34 and a 17-fold increase in cells that retain the ability to engraft immunodeficient mice. Currently Novartis is conducting clinical trials, “LFU835-expanded Umbilical Cord Blood Hematopoietic Stem Cells in Patients With Hematological Malignancies”, related to this research.

Product information

CAS Number: 1227633-49-9

Molecular Weight: 429.54

Formula: C24H23N5OS

Chemical Name: 4-(2-((2-(benzo[b]thiophen-3-yl)-9-isopropyl-9H-purin-6-yl)amino)ethyl)phenol

Smiles: CC(C)N1C=NC2=C(NCCC3C=CC(O)=CC=3)N=C(N=C12)C1=CSC2=CC=CC=C21


InChi: InChI=1S/C24H23N5OS/c1-15(2)29-14-26-21-23(25-12-11-16-7-9-17(30)10-8-16)27-22(28-24(21)29)19-13-31-20-6-4-3-5-18(19)20/h3-10,13-15,30H,11-12H2,1-2H3,(H,25,27,28)

Technical Data

Appearance: Solid Power.

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

Solubility: DMSO up to 100 mM

Shipping Condition: Shipped under ambient temperature as non-hazardous chemical or refer to Certificate of Analysis

Storage Condition: Dry, dark and -20 oC for 1 year or refer to the Certificate of Analysis.

Shelf Life: ≥12 months if stored properly.

Stock Solution Storage: 0 - 4 oC for 1 month or refer to the Certificate of Analysis.

Drug Formulation: To be determined.

HS Tariff Code: 382200

How to use

In Vitro:

SR1 was used at 1 µM final concentration (DMSO 0.01%) in the ex vivo cell culture for 7-21 days. SR1 may be refreshed every 2-3 days during the culture.


  1. Anthony E. Boitano et al. Aryl Hydrocarbon Receptor Antagonists Promote the Expansion of Human Hematopoietic Stem Cells. (2010) Science 329(5997):1345-8
  2. Csaszar E, et al. Rapid expansion of human hematopoietic stem cells by automated control of inhibitory feedback signaling.(2012) Cell Stem Cell.10(2):218-29.

Products are for research use only. Not for human use.


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