X-376

• CAT Number: I001406
• CAS Number: 1365267-27-1
• Molecular Formula: C25H25Cl2FN6O3
• Molecular Weight: 547.41
• Purity: ≥95%
• Synonyms: 6-amino-5-[(1R)-1-(2,6-dichloro-3-fluorophenyl)ethoxy]-N-[4-(4-methylpiperazine-1-carbonyl)phenyl]pyridazine-3-carboxamide
• InChI: InChI=1S/C25H25Cl2FN6O3/c1-14(21-17(26)7-8-18(28)22(21)27)37-20-13-19(31-32-23(20)29)24(35)30-16-5-3-15(4-6-16)25(36)34-11-9-33(2)10-12-34/h3-8,13-14H,9-12H2,1-2H3,(H2,29,32)(H,30,35)/t14-/m1/s1
• InChIKey: ONPGOSVDVDPBCY-CQSZACIVSA-N
• SMILES: CC(C1=C(C=CC(=C1Cl)F)Cl)OC2=CC(=NN=C2N)C(=O)NC3=CC=C(C=C3)C(=O)N4CCN(CC4)C

X-376 is a potent and highly specific ALK tyrosine kinase inhibitor (TKI) (IC50=0.61 nM). X-376 is a less potent inhibitor of MET (IC50=0.69 nM). X-376 displays potent anti-tumor activity[1].
The ability of X-376 to inhibit the growth of different cancer cell lines harboring ALK fusions or point mutations is tested. X-376 is potent in H3122 lung cancer cells harboring EML4-ALK E13;A20 (IC50: 77 nM). X-376 is also potent in H2228 lung cancer cells harboring EML4-ALK E6a/b; A20 (IC50: 57 nM). Furthermore, X-376 is potent in SUDHL-1 lymphoma cells harboring NPM-ALK (IC50: 32 nM). X-376 also inhibits SY5Y neuroblastoma cells harboring ALK F1174L, MKN-45 gastric carcinoma cells harboring MET dependent, HepG2 cells and PC-9 lung cancer cell lines harboring EGFR exon 19 del with IC50s of 142 nM, 150 nM, 15.137 μM and 3.062 μM, respectively[1].
The effects of X-376 in vivo against H3122 xenografts are examined. A pharmacokinetic study reveals that X-376 shows substantial bioavailability and moderate half-lives in vivo. Nude mice harboring H3122 xenografts are treated with X-376 at 50 mg/kg bid. X-376 significantly delays the growth of tumors compared to vehicle alone. In the xenograft experiments, X-376 appears well-tolerated in vivo. Mouse weight is unaffected by X-376 treatment. Drug-treated mice appear healthy and do not display any signs of compound related toxicity. To further assess potential side effects of X-376, additional systemic toxicity and toxico-kinetic studies are performed in Sprague Dawley (SD) rats. Following 10 days of repeated oral administration of X-376 at 25, 50, 100 mg/kg in SD rats, all animals survive to study termination. The no significant toxicity (NST) levels are determined to be 50 mg/kg for X-376. At NST levels, X-376 achieves an AUC of 41 μM×hr and a Cmax of 5.04 μM[1].

Reference

[1]. Lovly CM, et al. Insights into ALK-driven cancers revealed through development of novel ALK tyrosine kinaseinhibitors. Cancer Res. 2011 Jul 15;71(14):4920-31.
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