System for cell-based screening
View Patent ↗The invention relates to an optical system for determining the distribution, environment, or activity of fluorescently labeled reporter molecules in cells for the purpose of screening large numbers of compounds for specific biological activity. The invention involves providing cells containing fluorescent reporter molecules in an array of locations and scanning numerous cells in each location with a fluorescent microscope, converting the optical information into digital data, and utilizing the digital data to determine the distribution, environment or activity of the fluorescently labeled reporter molecules in the cells. The array of locations may be an industry standard 96 well or 384 well microtiter plate or a microplate which is a microplate having a cells in a micropaterned array of locations. The invention includes apparatus and computerized method for processing, displaying and storing the data.
1. An automated method for detecting translocation of a cellular component of interest between a first cellular compartment and a second cellular compartment on and/or within cells comprising:
a) providing an array of locations that contain multiple cells, wherein the cells contain a plurality of fluorescent reporter molecules, wherein the plurality of fluorescent reporter molecules comprises optically distinguishable fluorescent reporter molecules that report on:
i) individual cells;
ii) the first cellular compartment;
iii) the second cellular compartment; and
iv) a cellular component of interest;
b) automatically scanning multiple cells in each of the locations containing cells to obtain fluorescent signals from the plurality of fluorescent reporter molecules;
c) automatically identifying cells from the fluorescent signals;
d) automatically defining a first cellular compartment mask and a second cellular compartment mask in the cells from the fluorescent signals;
e) automatically determining an intensity of the fluorescent signals from the fluorescent reporter molecules that report on the cellular component of interest; and
f) automatically determining one or both of the following:
i) a ratio of the intensity of the fluorescent signals from the fluorescent reporter molecules that report on the cellular component of interest in the first cellular compartment mask and the second cellular compartment mask; and
ii) a difference of the intensity of the fluorescent signals from the fluorescent reporter molecules that report on the cellular component of interest in the first cellular compartment mask and the second cellular compartment mask;
wherein the ratio of the intensity of the fluorescent signals from the fluorescent reporter molecules that report on the cellular component of interest in the first cellular compartment mask and the second cellular compartment mask and/or the difference of the intensity of the fluorescent signals from the fluorescent reporter molecules that report on the cellular component of interest in the first cellular compartment mask and the.second cellular compartment mask provides a measure of the translocation of the cellular component of interest between the first cellular compartment and the second cellular compartment on and/or within the cells.
2. The method of claim 1 , wherein the method further comprises contacting the cells with a test compound, and wherein the ratio of the intensity of the fluorescent signals from the fluorescent reporter molecules that report on the cellular component of interest in the first cellular compartment mask and the second cellular compartment mask and/or the difference of the intensity of the fluorescent signals from the fluorescent reporter molecules that report on the cellular component of interest in the first cellular compartment mask and the second cellular compartment mask provides a measure of test compound-Induced translocation of the cellular component of interest between the different cellular compartments on and/or within the cells.
3. The method of claim 1 , wherein the first cellular compartment and the second cellular compartment consist of a cell nucleus and a cell cytoplasm, and wherein the translocation consists of a translocation between the cell cytoplasm and the cell nucleus.
4. The method of claim 1 wherein the first cellular compartment and the second cellular compartment consist of a cell cytoplasm and a cell membrane, and wherein the translocation consists of a translocation between the cell cytoplasm and the cell membrane.
5. The method of claim 1 , wherein the plurality of fluorescent reporter molecules comprise fluorescent reporter molecules expressed by the cells.
6. The method of claim 1 , wherein the plurality of fluorescent reporter molecules are expressed by the cells.
7. The method of claim 1 , wherein the plurality of fluorescent reporter molecules comprise fluorescent reporter molecules added to the cells.
8. The method of claim 1 , wherein the plurality of fluorescent reporter molecules are added to the cells.
9. The method of claim 1 wherein the plurality of fluorescent reporter molecules comprise antibodies.
10. The method of claim 1 wherein the plurality of fluorescent reporter molecules comprise compounds that report on DNA.
11. The method of claim 1 wherein the cellular component of interest comprises a protein.
12. The method of claim 11 , wherein the protein comprises a transcription factor.