1. Cytoskeleton
  2. Myosin

MS-444 (Synonyms: BE-34776)

Cat. No.: HY-100685
Handling Instructions

MS-444 inhibits the activity of purified smooth muscle myosin light chain kinase (MLCK) with an IC50 value of 10 μM.

For research use only. We do not sell to patients.

MS-444 Chemical Structure

MS-444 Chemical Structure

CAS No. : 150045-18-4

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Customer Review

  • Biological Activity

  • Protocol

  • Technical Information

  • Purity & Documentation

  • References


MS-444 inhibits the activity of purified smooth muscle myosin light chain kinase (MLCK) with an IC50 value of 10 μM.

IC50 & Target

IC50: 10 μM (myosin)[1].

In Vitro

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].

In Vivo

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].

Solvent & Solubility
In Vitro: 

10 mM in DMSO

Stock Solutions
Concentration Solvent Mass 1 mg 5 mg 10 mg
1 mM 4.3437 mL 21.7184 mL 43.4367 mL
5 mM 0.8687 mL 4.3437 mL 8.6873 mL
10 mM 0.4344 mL 2.1718 mL 4.3437 mL
*Please refer to the solubility information to select the appropriate solvent.
Cell Assay

Human colorectal cancer cell lines RKO, HCA-7, HCT116, HT-29, SW480 and the non-transformed intestinal epithelial cell lines RIE-1, YAMC are treated with varying concentrations of MS-444 (1-100 μM) for 48 hr. Cell survival is measured by MTT assay after incubation of cells for 48 hr with MS-444. Relative cell survival is calculated as percentage normalized to DMSO vehicle-treated cells and plotted to determine IC50[2].

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

Animal Administration

Athymic nude (Nu/Nu) mice are used. HCT116 (2×106 cells) and HCA-7 (2.5×106) cells resuspended in PBS are injected into the dorsal subcutaneous tissue. Mice (n=5 per group) receive intraperitoneal (IP) injections of MS-444 (25 mg/kg) dissolved in PBS/5% N-Methyl Pyrrolidine (NMP) or vehicle control every 48 hr. Tumor growth is assayed[2].

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

Molecular Weight









Please store the product under the recommended conditions in the Certificate of Analysis.


Room temperature in continental US; may vary elsewhere

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Cat. No.: HY-100685