ISRIB (trans-isomer) --- Inhibitor of “Integrated Stress Response” (ISR)

Catalog No. size PriceQuantity
M60125-2S 2 mg solid $129
M60125-10S 10 mg solid $510


In cells, distinct stress conditions activate different downstream kinases, including PERK, that converge on phosphorylating the α-subunit of initiation factor 2 (eIF2α ). This collection of signaling pathways is termed the ‘integrated stress response’ (ISR). Trans-ISRIB is a potent and selective small molecule inhibitor of PERK signaling (IC50 ~5 nM) that can potently reverse the effects of eIF2α phosphorylation. ISRIB reduces the viability of cells subjected to PERK-activation by chronic endoplasmic reticulum (ER) stress. The deleterious synergistic effect between ER-stress and ISRIB may be generally advantageous to kill cancer cells, especially those derived from secretory lineages that have increased secretory load and increased basal levels of ER stress (including myelomas, and pancreatic and breast cancers). Importantly, by acting downstream of eIF2α phosphorylation, ISRIB blocks multiple stress effectors. eIF2α phosphorylation is also implicated in memory consolidation. Remarkably, ISRIB-treated mice display significant enhancement in spatial and fear-associated learning. Thus, memory consolidation is inherently limited by the ISR, and ISRIB releases this brake. ISRIB may serve as an invaluable tool in deciphering higher order brain functions and perhaps be further developed as a therapeutic agent effecting memory impairment.

Product information

CAS Number: 1597403-47-8

Molecular Weight: 451.34

Formula: C22H24Cl2N2O4

Chemical Name: N,N'-((1r,4r)-cyclohexane-1,4-diyl)bis(2-(4-chlorophenoxy)acetamide)

Smiles: O=C(COC1C=CC(Cl)=CC=1)N[C@@H]1CC[C@H](CC1)NC(=O)COC1C=CC(Cl)=CC=1


InChi: InChI=1S/C22H24Cl2N2O4/c23-15-1-9-19(10-2-15)29-13-21(27)25-17-5-7-18(8-6-17)26-22(28)14-30-20-11-3-16(24)4-12-20/h1-4,9-12,17-18H,5-8,13-14H2,(H,25,27)(H,26,28)/t17-,18-

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:

Trans-ISRIB was used at 0.2 μM final concentration in various in vitro assays.

In Vivo:

Trans-ISRIB could be dosed to the mice by intraperitoneal injection at 2.5-5 mg/kg administration single dose. Trans-ISRIB displayed a half-life in plasma of 8 hr and readily crossed the blood-brain barrier, quickly equilibrating with the central nervous system.


  1. Sidrauski C, et al. Pharmacological brake-release of mRNA translation enhances cognitive memory. (2013) Elife. 2:e00498.

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


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