MS-444

• CAT Number: M095019
• CAS Number: 150045-18-4
• Molecular Formula: C13H10O4
• Molecular Weight: 230.22
• Purity: ≥95%
• Synonyms: 5,8-dihydroxy-3-methyl-9H-benzo[f][2]benzofuran-4-one
• InChI: InChI=1S/C13H10O4/c1-6-11-7(5-17-6)4-8-9(14)2-3-10(15)12(8)13(11)16/h2-3,5,14-15H,4H2,1H3
• InChIKey: TZUYDLKHNQUNKS-UHFFFAOYSA-N
• SMILES: CC1=C2C(=CO1)CC3=C(C=CC(=C3C2=O)O)O

MS-444 inhibits the activity of purified smooth muscle myosin light chain kinase (MLCK) with an IC50 value of 10 μM.
MS-444 is a small molecule RNA-binding protein HuR (ELAVL1) inhibitor. Colorectal cancer (CRC) cells that display HuR overexpression are treated with MS-444 (1-100 μM) for 48 hr with IC50s of 10.98±1.76 μM, 12.84±2.10 μM, 5.60±0.90 μM, 14.21±2.11 μM, and 10.98±1.24 μM for HCT116, HCA-7, RKO, HT-29, and SW480 cells, respectively. Growth inhibition is observed in all CRC lines with IC50 values ranging from 5.60 μM to 14.21 μM with observable effects seen at 10 μM MS-444. Contrasting effects are observed using non-transformed small intestinal (RIE-1 (IC50=40.70±3.53 μM)) and colonic (YAMC (IC50=28.16±3.23 μM)) epithelial cells. Both cell types display properties of normal intestinal epithelial cells and are proficient in 3′UTR AU-rich elements (ARE)-mRNA decay. Both non-transformed cell lines are ~3- to 4-fold less responsive to MS-444-mediated growth inhibition, with IC50 values of 40.70 μM and 28.16 μM (P<0.05)[2].
To test the effects of MS-444 on CRC cell growth in vivo, mice bearing HCT116 cell xenografts receive IP injections of MS-444 (25 mg/kg bw) or vehicle every 48 hr. Over the experiment course, mice do not display any adverse effects and maintained similar weights. Anti-tumor effects of MS-444 are observed with approximately 1.7-fold reduction in tumor size. Mice treated with MS-444 show a marked 2- to 3-fold decrease in microvessel density (MVD), indicating the anti-angiogenic potential of MS-444[2].

Reference

[1]. Satoshi Nakanishi. et al. MS-444, a new inhibitor of myosin light chain kinase from Micromonosporasp.KY7123. The Journal Of Antibiotics. 1995,48(9):948-951.
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[2]. Fernando F. Blanco.et al, Impact of HuR inhibition by the small molecule MS-444 on colorectal cancer cell tumorigenesis. Oncotarget. 2016 Nov 8; 7(45): 74043-74058.
 [Content Brief]