Detection of myosin light chain phosphorylation--a cell-based assay for screening Rho-kinase inhibitors.

Here, we describe the first example of a cell-based myosin light chain phosphorylation assay in 96-well format that allows for the rapid screening of novel Rho-kinase inhibitors. We obtained IC(50) values for the prototypic Rho-kinase inhibitors Y-27632 (1.2+/-0.05microM) and Fasudil (3.7+/-1.2microM) that were similar to those previously published utilizing electrophoresis-based methodologies. H-1152P, a Fasudil analog showed an IC(50) value of 77+/-30nM. Data derived from a set of 21 novel Rho-kinase inhibitors correlate with those generated by a well-established cell-based phenotypic Rho-kinase inhibition assay (R(2)=0.744). These results show that imaging technology measuring changes in myosin light chain phosphorylation can be used to rapidly generate quantitative IC(50) values and to screen a larger set of small molecule Rho-kinase inhibitors and suggests that this approach can be broadly applied to other cell lines and signaling pathways.