Breast Cancer Cell Density: Imaging assay of the density- and context-dependence of small molecule perturbagen response in breast cancer cell lines. Dataset 2 of 3: Mean cell count and mean normalized growth rate inhibition values across all replicates. - Dataset (ID:20257)

HMS Dataset ID: 20257
Dataset Title: Breast Cancer Cell Density: Imaging assay of the density- and context-dependence of small molecule perturbagen response in breast cancer cell lines. Dataset 2 of 3: Mean cell count and mean normalized growth rate inhibition values across all replicates.
Publication(s) Using Dataset: PMID: 27135972
Screening Lab Investigator: Marc Hafner, Mario Niepel
Screening Principal Investigator: Peter K. Sorger
Assay Description: The density- and context-dependent sensitivities of 6 cell lines plated at 6 different cell densities were assayed by measuring cell counts 72 hours after treatment with each of 12 small molecule inhibitors across a 9-point dose range.
Assay Protocol: 1. For each cell line, cells were plated at the indicated density in 60 uL of growth media in quadruplicate 384-well plates. The cells then were grown for 24 hours. For growth conditions, see PMC3845839.
2. Three plates per cell line were treated with the indicated small molecules by direct dispensing of DMSO stock solutions to the indicated concentrations into 60 µL of media using an HP D300 Digital Dispenser.
3. Immediately after treatment of these three plates, the untreated fourth plate for each cell line was fixed and stained by adding 20 μL of fixative containing formaldehyde solution and Hoechst 33342 at a final concentration of 3% formaldehyde and 250 ng/mL Hoechst. This plate was sealed and kept at 4°C until day 3 of the assay.
4. On day 3 the treated plates were fixed, stained, and sealed as described in step 3.
5. After 1 hour all plates were scanned with a PE Operetta high-throughput plate scanner.
6. Nuclei were counted using Columbus software.
7. Nuclei counts were normalized to DMSO-treated controls at the same plating density and on the same plate to yield relative cell count and normalized growth rate inhibition (GR) values for each plate (technical replicate) for each cell line/density/small molecule/concentration combination (HMS LINCS Datasets #20256). Relative cell count is the measured cell count for a given treatment divided by the 50%-trimmed mean of the cell count of the DMSO-treated control wells on the same plate. Normalized growth rate inhibition values were calculated according to the following formula: 2^[log2(x(c)/x0)/log2(xctrl/x0)]-1 where x(c) is the measured cell count after a given treatment, x0 is the 50%-trimmed mean of the cell count from the day 0 untreated plate grown in parallel until the time of treatment, and xctrl is the 50%-trimmed mean of the cell count of the DMSO-treated control wells on the same treated plate.
8. Second, the results from the three treated plates (technical replicates) were averaged to yield the mean relative cell count and the mean normalized growth rate inhibition (GR) value for each cell line/density/small molecule/concentration combination (HMS LINCS Datasets #20257).
9. For each cell line/density/small molecule combination, mean normalized growth rate inhibition (GR) values across all tested concentrations were fitted to a sigmoidal curve to extract the GR50, GEC50, GRmax, GRinf, Hill coefficient, and GR_AOC (HMS LINCS Dataset #20258). For comparison purposes only, mean relative cell counts across the tested concentrations for each cell line/density/small molecule combination also were fitted to a sigmoidal curve to extract the IC50, EC50, Emax, Einf, Hill coefficient, and IC_AUC (HMS LINCS Dataset #20258).
HMS Dataset Type: Microscopy/Imaging
Date Publicly Available: 2016-02-04
Most Recent Update: 2017-03-14