RIPK1 Inhibitor

Necrostatin 2 racemate (Nec-1S), the Necrostatin-1 (HY-15760) stable, is a potent and specific RIPK1 inhibitor lacking the IDO-targeting effect.

Apostatin-1 (Apt-1) is a potent TRADD inhibitor. Apostatin-1 can bind with TRADD-N (K_D=2.17 μM), disrupting its binding to both TRADD-C and TRAF2. Apostatin-1 modulates the ubiquitination of RIPK1 and beclin 1. Apostatin-1 blocks apoptosis and restores cellular homeostasis by activating autophagy in cells with accumulated mutant tau, α-synuclein, or huntingtin.

ICCB-19 hydrochloride is a TRADD (TNFRSF1A associated via death domain) inhibitor. ICCB-19 hydrochloride binds with N-terminal domain of TRADD (TRADD-N), disrupting its binding to both TRADD-C and TRAF2. ICCB-19 hydrochloride is indirect inhibitor of RIPK1 kinase activity. ICCB-19 hydrochloride effectively induces autophagy and the degradation of long-lived proteins.

Necrostatin 2 is a potent necroptosis inhibitor. EC₅₀ for inhibition of necroptosis in FADD-deficient Jurkat T cells treated with TNF-α is 0.05 μM. Necrostatin 2 is also a RIPK1 inhibitor.

Eclitasertib (DNL-758) is a potent receptor-interacting protein kinase 1 (RIPK1) inhibitor with an IC₅₀ of 0.0375 µΜ.

RIPK1/RIPK3-PPI-IN-1 is an orally active dual-target inhibitor of RIPK1/RIPK3, with a K_d value of 2.4 nM for RIPK1 and 24 nM for RIPK3. RIPK1/RIPK3-PPI-IN-1 inhibits the phosphorylation of RIPK1, RIPK3 and MLKL, thereby suppressing necroptosis. RIPK1/RIPK3-PPI-IN-1 restores body temperature, improves survival rate, and reduces IL-1β/IL-6 levels in serum and multiple organs of Mus musculus, thus alleviating TNF-α-induced systemic inflammatory response syndrome. RIPK1/RIPK3-PPI-IN-1 can be used in research related to systemic inflammatory response syndrome.

VWK147 is a second-generation HSP90 C-terminal domain (CTD) inhibitor. VWK147 targets the CTD dimerization interface, prevents HSP90 CTD dimerization, disrupts co-chaperone PPID binding to HSP90 CTD, and inhibits HSP90 chaperone function dependent on dimerization. VWK147 reduces protein levels of HSP90 client proteins ULK1, RIPK1, and CDK4 without inducing a heat shock response. VWK147 induces cell death, including apoptosis, in Cisplatin (HY-17394)-sensitive and -resistant urothelial carcinoma cells. VWK147 induces LC3-II accumulation, inhibits autophagosome-lysosome fusion to block canonical autophagy, and induces non-canonical LC3 lipidation independent of ULK1 and PIK3C3 complexes. VWK147 can be used for the research of urothelial carcinoma.

LT-1339-553 is a selective, orally active RIPK1 inhibitor with IC₅₀ values of 4.32, 95.74 and 84.33 nM against RIPK1, RIPK2 and RIPK3, respectively. LT-1339-553 exerts anti-necroptotic activity by inhibiting the AKT/PI3K/NF-κB pathway and the IL-17 pathway. LT-1339-553 reduces liver injury, inflammatory responses and collagen deposition. LT-1339-553 can be used in studies related to schistosomiasis-induced liver fibrosis.

Oditrasertib (SAR443820) is an orally active, BBB-penetrable and selective reversible inhibitor of RIPK1. Oditrasertib can be used in the research of chronic inflammatory central nervous system diseases, such as amyotrophic lateral sclerosis and multiple sclerosis.

Ligustroflavone is an orally active flavonoid compound. Ligustroflavone can be extracted from Ligustrum lucidum. Ligustroflavone antagonizes the calcium-sensing receptor (CaSR), inhibits the RIPK1/RIPK3/MLKL pathway, and downregulates TGF-β/Smad signaling. Ligustroflavone regulates calcium metabolism, protects bone tissue, reduces cerebral ischemic injury, and inhibits liver fibrosis. Ligustroflavone can be used in the study of diabetic osteoporosis, ischemic stroke, and liver fibrosis.

Necrostatin-5 (Nec-5) is a potent necroptosis inhibitor with an EC₅₀ value of 0.24 µM. Necrostatin-5 also is a RIP1 inhibitor. Necrostatin-5 shows cardioprotective effects.

Ocadusertib is a potent Serine/Threonine kinase receptor-interacting protein kinase 1 (RIPK1) inhibitor.

PK68 is a potent orally active and specifical type II inhibitor of receptor-interacting kinase 1 (RIPK1) with an IC₅₀ of ~90 nM, displays inhibition of RIPK1-dependent necroptosis. PK68 powerfully ameliorates TNF-induced systemic inflammatory response syndrome, and can be used for the research of inflammatory disorders and cancer metastasis.

ZB-R-55 is an orally active and selective dual-mode RIPK1 inhibitor with RIPK1 IC₅₀ values of 5.7 nM. ZB-R-55 occupies both the allosteric and ATP binding sites of RIPK1. ZB-R-55 inhibits necroptosis in cancer cells. ZB-R-55 can be used for the research of systemic inflammatory response syndrome and sepsis.

RIPK1-IN-4 (compound 8) is a potent and selective type II kinase inhibitor of receptor interacting protein 1 (RIP1) kinase and binds to a DLG-out inactive form of RIP1 with an IC₅₀s of 16 nM and 10 nM for RIP1 and ADP-Glo kinase.

Zharp1-211 is a RIPK1 kinase inhibitor with an EC₅₀ of 53 nM and a K_d of 8.7 nM. Zharp1-211 reduces IFN-γ-induced STAT1 activation. Zharp1-211 can be used in the research of graft-versus-host disease and colon cancer.

Flizasertib (GDC-8264) is an orally active, reversible and selective RIP1 inhibitor with K_i^app values of 0.00071 μM and 0.0013 μM for human and cynomolgus monkey RIP1 kinase, respectively. Flizasertib blocks RIP1 autophosphorylation but does not affect RIP1 protein stability. Flizasertib inhibits pro-inflammatory cytokines (CCL3, CCL4, and IL-1β) production. Flizasertib results in inhibition of colitis and ileitis. Flizasertib can be used in the research of cardiac surgery-associated acute kidney injury.

RIPK1-IN-17 is an orally active, selective RIPK1 inhibitor (K_d = 17 nM) and shows no significant inhibition to RIPK3. RIPK1-IN-17 specifically inhibits necroptosis rather than apoptosis by inhibiting RIPK1, RIPK3, and MLKL phosphorylation. RIPK1-IN-17 protects mice from hypothermia and death. RIPK1-IN-17 can be used for the study of necroptosis-related diseases such as inflammatory response syndrome (SIRS).

Necrostatin 2 S enantiomer is the S enantiomer of Necrostatin 2 (HY-14622). Necrostatin 2 S enantiomer inhibits TNF-α-induced necroptosis in Jurkat T cells. Necrostatin 2 S enantiomer can be used for the research of ischemic brain injury (stroke).

RIPK1-IN-19 is a selective RIPK1 inhibitor (IC₅₀=15 nM). RIPK1-IN-19 does not show obvious activity against RIPK2, RIPK3, and RIPK4. RIPK1-IN-19 displays potent protective activity in TNFα-induced systemic inflammatory response syndrome (SIRS) model and Imiquimod (IMQ)-induced psoriasis model. RIPK1-IN-19 can be used in research on inflammation and immune system diseases.