Isolation, detection and use of biological cells
This invention relates to devices and methods for purifying, detecting and using biological cells. A variety of cell types including viable tumor, stem, immune and sperm cells can be purified from a complex biological sample using a column, including a pipette tip column. Methods of the invention can aid research, diagnosis and treatment of cancer. Purified viable cells can be detected on the column or eluted from the column and detected. Cells on a column can be used as a stationary phase for liquid chromatography. Cells may be removed, recovered and analyzed.
1. A column comprised of:
a) a column body;
b) a bottom frit attached to the open lower end of the column body;
c) a bed of medium in contact with the bottom frit, wherein the bed of medium is comprised of water-swollen beads, wherein the beads are compressible, wherein the bed of medium is not compressed, wherein the bed of medium has a packing density, wherein the packing density is in the range of 1.00 to 1.05, wherein the beads are comprised of a capture entity; and
d) a top frit attached to the column body, wherein the top frit is in contact with the bed of medium;
wherein the column is comprised of unconstrained flow channels, wherein the diameters of 98% to 100% of the flow channels are sufficiently large for cells to pass through.
2. The column of claim 1 , wherein the column body is a pipette tip.
3. A column comprised of:
a) a column body;
b) a bottom frit attached to the open lower end of the column body;
c) a bed of medium in contact with the bottom frit, wherein the bed of medium is not compressed, wherein the bed of medium is comprised of water-swollen beads, wherein the beads are compressible and wherein the beads are comprised of a capture entity; and
d) a top frit attached to the column body, wherein the top frit is in contact with the bed of medium;
wherein the column is comprised of unconstrained flow channels, wherein the minimum flow path diameter is greater than 8 μm.
4. The column of claim 3 , wherein the column body is a pipette tip.
5. The column of claim 3 , wherein the beads are impervious to reagents or solvents.
6. The column of claim 3 , wherein the capture entity is an antibody or an aptamer.
7. The column of claim 3 , wherein the bed of medium has a packing density, wherein the packing density is in the range of 1.00 to 1.05.
8. A method for capturing cells, comprised of:
a) providing the column of claim 1 ;
b) providing a biological sample comprised of cells;
c) aspirating the biological sample through the lower end of the column, wherein the sample is aspirated through the lower frit into the bed of medium;
d) expelling the biological sample, through the lower end of the column, wherein the biological sample is expelled through the bed of medium and through the lower frit; and
e) repeating steps (c) and (d) multiple times,
wherein the capture entities on the beads of the column associate with surface markers on the cells in the biological sample, whereby a portion of the cells are captured on the column.
9. The method of claim 8 , wherein a portion of the captured cells are viable.
10. The method of claim 8 , wherein the captured cells are uninduced.
11. The method of claim 8 , wherein following step (e),
f) a wash solution is optionally aspirated and expelled through the lower end of the column; and
g) the cells on the column are labeled.
12. The method of claim 8 , wherein after step (e), the following steps are performed:
f) aspirating and expelling a wash solution through the column using bidirectional flow; and
g) eluting the cells by passing an eluent through the column.
13. A method for capturing cells, comprised of:
a) providing the column of claim 2 ;
b) providing a biological sample comprised of cells;
c) aspirating the biological sample through the lower end of the column, wherein the sample is aspirated through the lower frit into the bed of medium;
d) expelling the biological sample, through the lower end of the column, wherein the biological sample is expelled through the bed of medium and through the lower frit; and
e) repeating steps (c) and (d) multiple times,
wherein the capture entities on the beads of the column associate with surface markers on the cells in the biological sample, whereby a portion of the cells are captured on the column.
14. The method of claim 13 , wherein the cells are uninduced.
15. The method of claim 13 , wherein after step (e), a drug is passed through the column using bidirectional flow.
16. The method of claim 13 , wherein after step (e), an antibody drug conjugate is passed through the column using bidirectional flow, wherein the antibody binds a cell surface marker on the captured cells.
17. The method of claim 15 , wherein the method is performed in parallel on multiple columns simultaneously and wherein it different drug is passed through each column.
18. The column of claim 1 , wherein the beads are comprised of a hydrophilic polymer.
19. The column of claim 1 , wherein the medium is selected from a list consisting of agarose, Sepharose, cellulose and dextran.
20. The column of claim 3 , wherein the beads are comprised of a hydrated gel resin.