CHEMBL5735276

Inhibition of fibrosis: Each compound was dissolved in DMSO as a 10 mM stock and used to prepare compound source plates. Serial dilution (1:3, 8-point dose-response curves from 15 μM to 5 nM) and compound transfer was performed using the ECHO 550 (Labcyte, Sunnyvale, Calif.) into 384-well clear bottom assay plates (Greiner Bio-One) with appropriate DMSO backfill for a final DMSO concentration of 0.1%. LL29 cells were plated at 1,000 cells/well in 50 μl/well serum free F12 medium. One hour after addition of the cells, TGF-β1 (Peprotech; 10 ng/ml) was added to the plates to induce fibrosis (ref 1 and 2 above). Wells untreated with TGF-β1 were used as control for normalization and calculating IC50 values. Cells were incubated at 37° C. and 5% CO2 for 3 days. Cells were fixed using 4% formaldehyde (Electron Microscopy Sciences), washed 3 times with PBS followed by blocking and permeabilization using 3% Bovine Serum Albumin (BSA; Sigma) and 0.3% Triton X-100 (Sigma) in PBS. Cells were then stained with antibody specific to α-smooth muscle actin (αSMA; Abcam) (ref. 1 and 2 above) in 3% Bovine Serum Albumin (BSA; Sigma) and 0.3% Triton X-100 (Sigma) in PBS, and incubated overnight at 4° C. Cells were then washed 3 times with PBS, followed by incubation with Alexa Flor-647 conjugated secondary antibody (Life Tech) and DAPI at room temperature for 1 hour. Cells were then washed 3 times with PBS and plates were sealed for imaging. αSMA staining was imaged by excitation at 630 nm and emission at 665 nm and quantified using the Compartmental Analysis program on the CellInsight CX5 (Thermo Scientific). % of total cells positive for αSMA were counted in each well and normalized to the average of 8 wells treated with TGF-β1 on the same plate using Excel (Microsoft Inc.). The normalized averages (fold change over untreated) of 6 replicate wells for each compound concentration were used to create dose-responses curves and IC50 values were calculated using non-linear regression curve fit in Prism (GraphPad).