at 56

RIPA-56 is an inhibitor of RIP1

Klotho-derived peptide 1 (KP1) (56-87), a peptide originating from the human Klotho protein, disrupts TGF-β signaling by binding to TGF-β receptor types 1 and 2 (TGFBR1 and TGFBR2; Kds = 1.41 and 14.6 µM, respectively). Preincubation with KP1 at a concentration of 10 µg/ml hinders the TGF-β-induced escalation of fibronectin and α-smooth muscle actin (α-SMA) levels in NRK-49F rat fibroblasts. Furthermore, in vivo studies reveal that KP1, administered at 1 mg/kg per day, preferentially accumulates in damaged kidneys, leading to significant reductions in serum creatinine and blood urea nitrogen levels, indicators of improved kidney function. Additionally, it decreases kidney fibrosis in mouse models of unilateral ureteral obstruction (UUO) and unilateral ischemia-reperfusion injury-induced renal fibrosis.

KRAS G12C inhibitor 56, a powerful inhibitor of SOS1 with an inhibitory concentration (IC50) of 1.6 nM, holds promise for use in cancer research.

Tubulin Polymerization-IN-56 (compound 8l), an indazole derivative, potently inhibits tubulin polymerization by targeting the colchicine site, which induces cell cycle arrest and apoptosis. Additionally, this compound diminishes cell migration and significantly inhibits tumor growth in vivo [1].

AT56, a specific inhibitor of prostaglandin D2 synthase enzymatic activity, blunted adipogenic aldosterone effects.

YW3-56 is a potent peptidylarginine deiminase (PAD) inhibitor, with an IC50 of 1-5 μM for PAD4. Compared with Cl-amidine, YW3-56 shows >60-fold increase in cell growth inhibition efficacy (IC50 about 2.5 μM) but only 5-fold increase in PAD4 inhibition (IC sub>50 about 1-5 μM). At 2-4 μM concentrations, YW3-56 displays mainly cytostatic effects by slowing cell division, whereas at higher concentrations, it exerts cytotoxic effects by altering cell morphology and killing cells[1]. [1]. Wang Y, et al. Anticancer peptidylarginine deiminase (PAD) inhibitors regulate the autophagy flux and t he mammalian target of rapamycin complex 1 activity. J Biol Chem. 2012 Jul 27;287(31):25941-53.

Anticancer agent 56 (compound 4d) is a powerful anti-cancer compound with favorable drug-like properties. It shows significant anticancer activity against multiple cancer cell lines, with an IC50 value of less than 3 μM. Anticancer agent 56 exerts its effects by causing cell cycle arrest at the G2/M phase and activating the mitochondrial apoptosis pathway. Mechanistically, it induces the accumulation of reactive oxygen species (ROS), upregulates BAX, downregulates Bcl-2, and triggers the activation of caspases 3, 7, and 9 [1].

Succinyl-(Pro58,D-Glu65)-Hirudin (56-65) (sulfated) is a hirugen-like peptide with greater thrombin affinity than Hirugen, exhibiting a dissociation constant (K D) of less than 100 nM. This compound acts as an antithrombotic agent, effectively inhibiting thrombin-induced fibrin clot formation with an inhibitory concentration (IC 50) of 0.087 μM [1].

EGFR-IN-56 (Compound 13a) is a potent inhibitor of EGFR, acting on EGFRT790M (IC50: 541.7 nM) and EGFRT790M/L858R (IC50: 132.1 nM). EGFR-IN-56 blocks the cell cycle of cancer cells in the G2/M phase and induces EGFR-IN-56 blocks the G2/M phase of the cancer cell cycle and induces apoptosis.

Anti-inflammatory agent 56 (Compound 9), a selective COX-2 inhibitor with an IC50 of 0.54 μM, exhibits anti-oxidant and anti-inflammatory properties by inhibiting oxidative stress-induced cell death and neuroinflammation through the suppression of Keap1, COX-2, and iNOS. It also demonstrates low acute toxicity in mice with an LD50 of 1000 mg/kg [1].

SARS-CoV-2-IN-56 (Compound 63) is a SARS-CoV-2 inhibitor with antiviral activity, demonstrating inhibition of the virus in Vero E6 cells with an IC50 of 0.7 μM [1].

SOD1-Derlin-1 Inhibitor 56-26 is a potent inhibitor of SOD1-Derlin-1 interaction.

INX-SM-56 is a cytotoxin designed for the synthesis of an anti-VISTA (V-region Immunoglobulin-containing Suppressor of T cell Activation [1]) antibody-agent conjugate.

HIV-1 inhibitor-56 (compound 12126065) is a potent non-nucleoside reverse transcriptase inhibitor with significant antiviral activity against wild-type HIV-1, exhibiting an EC50 value of 0.24 nM in TZM cells. Notably, this compound is capable of penetrating the blood-brain barrier [1].

Antibacterial agent 56 (example 22) is a antibacterial agent.

Antifungal agent 56 (compound A09) is a potent antifungal agent, demonstrating superior efficacy against Fluconazole-resistant strains and outperforming Miconazole. It effectively inhibits Candida albicans strains, with minimal inhibitory concentration (MIC) values ranging from 0.03 to 0.25 μg/mL [1].

YW3-56 is an inhibitor of protein arginine deiminase 2 (PAD2) and PAD4 (IC50s = 0.5-1 and 1-5 μM, respectively).1It inhibits the growth of U2OS osteosarcoma cells (IC50= ~2.5 μM) in a p53-dependent mannerviainduction of SESN2 and subsequent inhibition of mTORC1. YW3-56 (10 mg/kg) reduces tumor growth in an S-180 murine sarcoma tumor model. It also inhibits tumor growth in the 1883 MDA-MB-231 breast cancer bone metastasis mouse xenograft model.2 1.Wang, Y., Li, P., Wang, S., et al.Anticancer peptidylarginine deiminase (PAD) inhibitors regulate the autophagy flux and the mammalian target of rapamycin complex 1 activityThe Journal of Biological Chemisty287(31)25941-25952(2012) 2.Wang, S., Chen, X.A., Hu, J., et al.ATF4 gene network mediates cellular response to the anticancer PAD inhibitor YW3-56 in triple-negative breast cancer cellsMol. Cancer Ther.14(4)877-888(2015)

NF-56-EJ40 is an effective and highly selective antagonist of human SUCNR1 with an IC50 of 25 nM and a Ki of 33 nM.

Antitumor agent-56 is an orally active triptolide derivative that significantly inhibits melanoma growth, exhibiting anti-tumour, anti-inflammatory and NO-releasing effects.

Prepro-ANF (56-92), human, a precursor to the human atrial natriuretic factor, serves as an activator of guanylate cyclase, specifically enhancing particulate guanylate cyclase activity within the renal membrane and unit [1].

PSMA-ALB-56 is a PSMA-targeting radioactive ligand with antitumor activity designed by binding glutamic urea PSMA binding entities, DOTA chelating agents, and albumin binators based on 4-(p-iodophenyl)- fragment or p(tolyl)- fragment.

FY-56, a highly potent and selective inhibitor of LSD1/KDM1A with an IC50 value of 42 nM, demonstrates significant selectivity over MAO-A/B. This compound effectively induces differentiation in MOLM-13 and MV4-11 cells, showing promise for acute myeloid leukemia (AML) research [1].

NF-56-EJ40 hydrochloride is a potent, high-affinity, and highly selective human SUCNR1 (GPR91) antagonist with an IC50 of 25 nM and a Ki of 33 nM, and shows almost no activity towards rat SUCNR1. NF-56-EJ40 hydrochloride has high affinity for humanized rat SUCNR1 with a Ki value of 17.4 nM.

26RFa acetate is a hypothalamic neuropeptide with orexigenic activity in mammals[1].

Systemin acetate is an 18-amino acid polypeptide with the sequence AVQSKPPSKRDPPKMQTD that is found in Solanaceae plants (such as tomato and potato).

Rac1 Inhibitor W56 acetate(1095179-01-3 free base) is a peptide comprising residues 45-60 of the guanine nucleotide exchange factor (GEF) recognition/activation site of Rac1. Rac1 Inhibitor W56 acetate(1095179-01-3 free base) selectively inhibits Rac1 interaction with Rac1-specific GEFs TrioN, GEF-H1 and Tiam1.

FIN56 is a specific inducer of ferroptosis.

CIL56 (CA3) is a small molecule that induces cellular ferroptosis through the production of iron-dependent reactive oxygen species (ROS). It also induces accumulation of long-chain saturated, monounsaturated, and polyunsaturated fatty acids in HT-1080 cells in vitro.HT-1080 cells lacking acetyl-CoA carboxylase 1 (ACC1), the rate-limiting enzyme in fatty acid synthesis, exhibit 5-fold resistance to CIL56 treatment, indicating ACC1 activity sensitizes cells to CIL56-induced cell death.

SOD1-Derlin-1 inhibitor 56-59 is an inhibitor of SOD1-Derlin-1 interaction. SOD1-Derlin-1 inhibitor 56-59 is potential in Amyotrophic lateral sclerosis (ALS) research.

Nafarelin acetate(76932-56-4 free base) (RS-94991-298) is a GnRH agonist that acts as an analog of GnRH. Nafarelin acetate(76932-56-4 free base) causes a decrease in the pituitary secretion of gonadotropins luteinizing hormone (LH) and follicle-stimulating hormone (FSH). It may be used in the treatment of estrogen-dependent conditions.

T56-LIMKi (T5601640) is a selective inhibitor of LIMK2.

HS56 is an ATP-competitive dual Pim/DAPK3 inhibitor, displaying K i values of 0.26 μM for DAPK3, 0.208 μM for Pim-3, 2.94 μM for Pim-1, and >100 μM for Pim-2. This compound effectively inhibits LC20 phosphorylation and smooth muscle contraction, and reduces blood pressure in spontaneously hypertensive mice, making it a valuable tool for hypertension research.

Leptin(22-56),human is a peptide fragment of Leptin, which ACTS through a variety of subtypes of Ob-Rs.

EMI56, a derivative of EMI1, exhibits enhanced potency against mutant EGFR compared to EMI1. Additionally, EMI56 effectively inhibits EGFR triple mutants[1].

Rac1 Inhibitor W56 TFA, a peptide comprised of residues 45-60 of Rac1, selectively obstructs Rac1's interaction with the guanine nucleotide exchange factors TrioN, GEF-H1, and Tiam [1].

β-Interleukin II is a peptide with the sequence NH2-ILE-LEU-ASN-GLY-ILE-ASN-ASN-TYR-LYS-ASN-PRO-LYS-LEU-COOH.

UP202-56 is an adenosinergic agonist and is an adenosine analog.

Org 25543 hydrochloride is a potent and selective glycine transporter type 2 (GlyT2) inhibitor (IC50 = 16 nM for hGlyT2). Displays no activity at GlyT1 or 56 other common biological targets (≥ 100 μM), in a glycine uptake assay in CHO cells.

MDL-811, an allosteric activator of SIRT6, markedly enhances the deacetylation of histone H3 at lysine residues 9, 18, and 56 (H3K9Ac, H3K18Ac, and H3K56Ac), presenting potential utility in colorectal cancer research [1].

Zonisamide-13C2,15N is intended for use as an internal standard for the quantification of zonisamide by GC- or LC-MS. Zonisamide is an antiepileptic agent.1 It selectively inhibits the repeated firing of sodium channels (IC50 = 2 μg/ml) in mouse embryo spinal cord neurons and inhibits spontaneous channel firing when used at concentrations greater than 10 μg/ml.2 In rat cerebral cortex neurons, zonisamide (1-1,000 μM) inhibits T-type calcium channels with a maximum reduction of 60% of the calcium current.3 Zonisamide inhibits H. pylori recombinant carbonic anhydrase (CA) and the human CA isoforms I, II, and V with Ki values of 218, 56, 35, and 21 nM, respectively.4,5 In mice, it has anticonvulsant activity against maximal electroshock seizure (MES) and pentylenetetrazole-induced maximal, but not minimal, seizures (ED50s = 19.6, 9.3, and >500 mg/kg, respectively). Zonisamide (40 mg/kg, p.o.) prevents MPTP-induced decreases in the levels of dopamine , but not homovanillic acid or dihydroxyphenyl acetic acid , and increases MPTP-induced decreases in the dopamine turnover rate in mouse striatum in a model of Parkinson's disease.6 Formulations containing zonisamide have been used in the treatment of partial seizures in adults with epilepsy. |1. Masuda, Y., Ishizaki, M., and Shimizu, M. Zonisamide: Pharmacology and clinical efficacy in epilepsy. CNS Drug Rev. 4(4), 341-360 (1998).|2. Rock, D.M., Macdonald, R.L., and Taylor, C.P. Blockade of sustained repetitive action potentials in cultured spinal cord neurons by zonisamide (AD 810, CI 912), a novel anticonvulsant. Epilepsy Res. 3(2), 138-143 (1989).|3. Suzuki, S., Kawakami, K., Nishimura, S., et al. Zonisamide blocks T-type calcium channel in cultured neurons of rat cerebral cortex. Epilepsy Res. 12(1), 21-27 (1992).|4. Nishimori, I., Vullo, D., Minakuchi, T., et al. Carbonic anhydrase inhibitors: Cloning and sulfonamide inhibition studies of a carboxyterminal truncated α-carbonic anhydrase from Helicobacter pylori. Bioorg. Med. Chem. Lett. 16(8), 2182-2188 (2006).|5. De Simone, G., Di Fiore, A., Menchise, V., et al. Carbonic anhydrase inhibitors. Zonisamide is an effective inhibitor of the cytosolic isozyme II and mitochondrial isozyme V: Solution and X-ray crystallographic studies. Bioorg. Med. Chem. Lett. 15(9), 2315-2320 (2005).|6. Yabe, H., Choudhury, M.E., Kubo, M., et al. Zonisamide increases dopamine turnover in the striatum of mice and common marmosets treated with MPTP. J. Pharmacol. Sci. 110(1), 64-68 (2009).

3-Acetyl-6-bromocoumarin is a coumarin derivative that has exhibited potent antioxidant activity, demonstrated at a rate of 56% [1].

Unifiram is a nootropic agent.1It increases acetylcholine (ACh) release in the rat cerebral cortexin vivoand induces a long-lasting increase in the amplitude of field excitatory postsynaptic potentials (fEPSPs) in the rat hippocampal CA1 region (EC50= 27 nM). It does not bind to serotonin (5-HT), dopamine, muscarinic, nicotinic, adrenergic, glutamate, histamine, opioid, or GABA receptors at 1 μM. Unifiram (0.1 mg/kg) improves memory in non-memory-impaired rats in a social learning test.2It also prevents memory deficits induced by the anticholinergic agent scopolamine, nicotinic receptor antagonist mecamylamine, GABABreceptor agonist baclofen, or α2-adrenergic receptor agonist clonidine in the passive avoidance test in mice when administered at a dose of 0.01 mg/kg and prevents memory deficits induced by the AMPA/kainate glutamate receptor antagonist NBQX at 0.1 mg/kg.1 1.Romanelli, M.N., Galeotti, N., Ghelardini, C., et al.Pharmacological characterization of DM232 (unifiram) and DM235 (sunifiram), new potent cognition enhancersCNS Drug Rev.12(1)39-52(2006) 2.Ghelardini, C., Galeotti, N., Gualtieri, F., et al.The novel nootropic compound DM232 (unifiram) ameliorates memory impairment in mice and ratsDrug Develop. Res.56(1)23-32(2002)

CYM50308 is a high affinity agonist of sphingosine-1-phosphate receptor 4 (S1P4-R) (EC50: 56 nM). CYM50308 has no activity at S1P1-R, S1P2-R and S1P3-R subtypes at concentrations up to 25 μM and it shows 37-fold more selective for S1P4-R than S1P5-R.

Cambinol (SIRT1/2 Inhibitor IV) is a cell-permeable b-naphthol compound that inhibits the NAD-dependent deacetylase activity of SIRT1/2 (IC50: 56/59 μM, respectively) in a substrate-, but not NAD-, competitive manner. Cambinol inhibits SIRT5 deacetylase activity only at much higher concentrations (IC50 >300 μM) and no inhibitory for the class I and II HDACs. In BCL6-expressing Burkitt lymphoma cell lines, Cambinol-induced apoptosis has been attributed to the hyperacetylation of p53 and BCL6.Cambinol is a potent brain penetrant neutral sphingomyelinase (N-SMase) inhibitor (exosome inhibitor)

Tofacitinib maleate, also known as tasocitinib, CP-690550, is a Janus kinase (JAK) inhibitor. Tofacitinib maleate modulates the signaling pathway at the point of JAKs, preventing the phosphorylation and activation of STATs. JAK enzymes transmit cytokine signaling through pairing of JAKs (e.g., JAK1/JAK3, JAK1/JAK2, JAK1/TyK2, JAK2/JAK2). Tofacitinib maleate inhibited the in vitro activities of JAK1/JAK2, JAK1/JAK3, and JAK2/JAK2 combinations with IC50 of 406, 56, and 1377 nM, respectively.

11β-PGE2 is the C-11 epimer of PGE2. It is a moderate inhibitor of PGE2 binding to rat hypothalamic membranes with a Ki value of 53 nM.[1] 11β-PGE2 also stimulates bone resorption in rats at concentrations of 10-8 to 10-6 M which is similar to PGE2.2 11β-PGE2 inhibits PGE2 binding to the prostaglandin transporter protein with a Ki of 56 nM.[3] .

PD-85639 is a voltage-gated sodium (Na+) channel blocker (75% in 10 min & >95% in 25 min blockage of Na+ current by 25 μM PD85,639; whole-cell patch clamp using primary rat brain neurons) that is shown to target rat brain Nav1.2 with simultaneous high- and low-affinity modes of binding (EC50 = 56 nM/40% & 20 μM/60% at pH 9.0, 5 nM/28% & 3 μM/72% at pH 7.4, against 2 nM [3H]-PD85,639 for binding rat brain synaptosomes; EC50 = 17 nM/39% & 10 μM/61% using at pH 9.0 using rat brain synaptosome membranes) and a fast kinetic (t1/2 = 1.2 at 4°C, <0.5 min at 25°C), competitive against the local anesthetic Na+ channel blockers tetracaine, bupivacaine, and mepivacaine, as well as Na+ channel activators veratridine and batrachotoxin (K1 = 0.26 μM against 5 nM [3H]-BTX for binding rat neocrotical membranes).

Purfalcamine is an orally active, selective Plasmodium falciparum calcium-dependent protein kinase 1 (PfCDPK1) inhibitor with an IC50 of 17 nM and an EC50 of 230 nM. Purfalcamine has antimalarial activity and causes malaria parasites developmental arrest at the schizont stage[1][2]. Purfalcamine has low activity against Toxoplasma gondii calcium-dependent protein kinase 3 (TgCDPK3)[1]. Purfalcamine (225, 450 nM) has no effect on the parasitemia in the first 32 hours. After about 40 hours, parasite level remains stable and then begins dropping[1]. Purfalcamine inhibits proliferation with EC50s of 171-259 nM for P. falciparum strains (3D7, Dd2, FCB, HB3 and W2), which indicates effectiveness against drug-resistant parasites[1]. Given that the EC50 value for P. falciparum (3D7) is 230 nM, Purfalcamine shows a therapeutic window ranging from 23-fold to 36-fold (EC50s for CHO=12.33 μM, HEp2=7.235 μM, HeLa=7.029 μM and Huh7=5.476 μM)[1]. Purfalcamine (10 mg/kg; oral gavage; BID; for 6 days) demonstrates a delay in the onset of parasitemia in treated mice[1]. Purfalcamine (20 mg/kg; orally gavage) exhibits a Cmax of 2.6 μM with a half-life of 3.1 hours[1]. Animal Model: Male BALB/c mice, 7 weeks of age with the malaria parasite[1] [1]. Nobutaka Kato, et al. Gene expression signatures and small-molecule compounds link a protein kinase to Plasmodium falciparum motility. Nat Chem Biol. 2008 Jun;4(6):347-56. [2]. Rajshekhar Y Gaji, et al. Expression of the essential Kinase PfCDPK1 from Plasmodium falciparum in Toxoplasma gondii facilitates the discovery of novel antimalarial drugs. Antimicrob Agents Chemother. 2014 May;58(5):2598-607.

AN3661, a potent antimalarial lead compound, targets a Plasmodium falciparum cleavage and polyadenylation specificity factor homologue subunit 3 (PfCPSF3). AN3661 inhibits Plasmodium falciparum laboratory-adapted strains, Ugandan field isolates, and murine P. berghei and P. falciparum infections[1]. AN3661 is active at nanomolar (IC50=20-56 nM) concentrations against P. falciparum laboratory strains known to be sensitive (3D7) or resistant (W2, Dd2, K1, HB3, FCR3 and TM90C2B), and AN3661 is similarly active in ex vivo studies of fresh Ugandan field isolates (mean ex vivo IC50=64 nM). AN3661 shows minimal cytotoxicity against mammalian cell lines, with the CC50 60.5 μM against Jurkat cells, and all other CC50 values greater than the highest concentrations tested (25 μM or above)[1].AN3661 inhibits the stability of P. falciparum transcripts[1]. AN3661 (50-200 mg.kg; p.o.; daily for 4 days) inhibits murine P. berghei infections with ED90 (4 days) 0.34 mg/kg[1].AN3661 is administered orally for 4 days, beginning on the third day of infection, the ED90 4 days after initiation of treatment is 0.57 mg/kg[1]. Animal Model: P. berghei-infected mice (malaria model)[1] [1]. Sonoiki E, et al. A potent antimalarial benzoxaborole targets a Plasmodium falciparum cleavage and polyadenylation specificity factor homologue. Nat Commun. 2017;8:14574. Published 2017 Mar 6.

Zonisamide (AD 810), a sulfonamide anticonvulsant, is approved for use as an adjunctive treatment in adults with partial-onset seizures. It may inhibit a carbonic anhydrase although this is not one of the main mechanisms of action. Zonisamide may act by blocking repetitive firing of voltage-gated sodium channels results in a reduction of T-type calcium channel currents, or by binding allosterically to GABA receptors. This latter action may lower the uptake of the inhibitory neurotransmitter GABA while increasing the uptake of the excitatory neurotransmitter glutamate.

Zonisamide sodium is a 1,2 benzisoxazole derivative. It is the first agent of this chemical class to be developed as an antiepileptic drug.