Ethaselen

Ethaselen (BBSKE) is an orally active, selective thioredoxin reductase (TrxR) inhibitor with IC50s of 0.5 and 0.35 μM for the wild-type human TrxR1 and rat TrxR1, respectively. Ethaselen specifically binds to the unique selenocysteine-cysteine redox pair in the C-terminal active site of mammalian TrxR1. Ethaselen, an organoselenium compound, is a potent antitumor candidate that exerts potent inhibition on non-small cell lung cancer (NSCLC) by targeting TrxR.

Product information

CAS Number: 217798-39-5

Molecular Weight: 422.20

Formula: C16H12N2O2Se2

Chemical Name: 2-[2-(3-oxo-2,3-dihydro-1,2-benzoselenazol-2-yl)ethyl]-2,3-dihydro-1,2-benzoselenazol-3-one

Smiles: O=C1C2=CC=CC=C2[Se]N1CCN1[Se]C2=CC=CC=C2C1=O

InChiKey: SFFSGPCYJCMDJM-UHFFFAOYSA-N

InChi: InChI=1S/C16H12N2O2Se2/c19-15-11-5-1-3-7-13(11)21-17(15)9-10-18-16(20)12-6-2-4-8-14(12)22-18/h1-8H,9-10H2

Technical Data

Appearance: Solid Power

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

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:

Ethaselen (2.5-10 μM; 12, 24 hours) suppresses A549 cell viability in a both concentration- and time-dependent manner. H1666, which has considerably lower TrxR1 expression level, is less susceptible to 24 h treatment with Ethaselen. Ethaselen inhibits the intracellular TrxR1 activity in a concentration- and time-dependent manner, with IC50 values of 4.2 and 2 μM for 12- and 24-h treatments, respectively. Ethaselen (2.5-10 μM; 12, 24 hours) has no effect on the protein amounts of TrxR1 and Trx. The mRNA level of TrxR1 does not show significant alteration in Ethaselen-treated A549 cells. Ethaselen (2.5-50 μM; 1-24 hours) causes intracellular Trx oxidation in A549 cells. Ethaselen (5-10 μM; 12, 24 hours) causes a clear concentration-dependent increase in ROS levels in A549 cells. The inhibition constants for Ethaselen binding to free enzyme (Ki) and the enzyme-substrate complex (Kis) were determined to be 0.022 and 0.087 μM, respectively. Ethaselen also inhibits mammalian TrxR1 in a time-dependent manner possibly by forming a covalent Se-S bond with Cys497 of Trx.

In Vivo:

Ethaselen (BBSKE; 36-108 mg/kg/day; PO; for 10 days) shows increased inhibition of tumor growth in a dose-independent manner.

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