Methods for preparing therapeutically active cells using microfluidics
The present invention is directed to the use of microfluidics in the preparation of cells and compositions for therapeutic uses.
1. A method for preparing central memory T cells from an apheresis or leukapheresis sample, comprising:
a) purifying the central memory T cells from the sample by a combination of a Deterministic Lateral Displacement (DLD) step, and in addition to the DLD step, an affinity separation step; and
b) expanding the central memory T cells purified in step a) by culturing the central memory T cells in the presence of an activator.
2. The method of claim 1 , wherein after the central memory T cells have been purified by DLD and said affinity step, they are genetically engineered to express a therapeutically active protein.
3. The method of claim 1 , wherein, before DLD is performed, the central memory T cells are bound to one or more carriers in a way that promotes DLD separation.
4. The method of claim 3 , wherein said one or more carriers comprise an antibody or activator that binds specifically to T cells.
5. The method of claim 4 , wherein said one or more carriers are magnetized.
6. The method of claim 4 , wherein the carriers comprise an anti CD3 antibody.
7. The method of claim 1 , wherein during the expansion of cells by culturing in the presence of activator, a greater percentage of cells express cluster of differentiation (CD) antigens characteristic of a memory phenotype than cells obtained by affinity separation alone.
8. The method of claim 1 , wherein said apheresis or leukapheresis sample is obtained from a patient with cancer, an autoimmune disease or an infectious disease.
9. The method of claim 1 wherein DLD is performed on a microfluidic device comprising:
a) at least one channel extending from a sample inlet to one or more fluid outlets, wherein the channel is bounded by a first wall and a second wall opposite from the first wall;
b) an array of obstacles arranged in rows in the channel, each subsequent row of obstacles being shifted laterally with respect to a previous row, and wherein said obstacles are disposed in a manner such that, when the apheresis or leukapheresis sample is applied to an inlet of the device and fluidically passed through the channel, T cells in the composition flow to one or more collection outlets where an enriched product is collected, and cells, or particles that are in the apheresis or leukapheresis sample and that are of a different size than the T cells, flow to one more waste outlets that are separate from the collection outlets.
10. The method of claim 9 , wherein the affinity separation step comprises binding the T cells to magnetic beads that bind specifically to T cells.
11. The method of claim 10 , wherein said DLD is performed before said affinity separation step.
12. The method of claim 1 , wherein the affinity separation step comprises binding the central memory T cells to magnetic beads that bind specifically to T cells.
13. The method of claim 1 , wherein after the central memory T cells have been purified by said DLD and said affinity step, they are genetically engineered to produce chimeric antigen receptors (CARs) on their surface.
14. The method of claim 13 , wherein the apheresis sample is obtained from a patient with cancer and the genetically engineered cells are administered to the same patient.
15. The method of claim 14 , wherein the yield of T cells expressing the chimeric receptors on their surface is at least 20% greater than T cells isolated by apheresis or leukapheresis and subjected to magnetic separation but not DLD.
16. The method of claim 13 , wherein DLD is performed on a microfluidic device comprising:
a) at least one channel extending from a sample inlet to one or more fluid outlets, wherein the channel is bounded by a first wall and a second wall opposite from the first wall;
b) an array of obstacles arranged in rows in the channel, each subsequent row of obstacles being shifted laterally with respect to a previous row, and wherein said obstacles are disposed in a manner such that, when the apheresis or leukapheresis sample is applied to an inlet of the device and fluidically passed through the channel, T cells in the composition flow to one or more collection outlets where an enriched product is collected, and cells, or particles that are in the apheresis or leukapheresis sample and that are of a different size than the T cells, flow to one more waste outlets that are separate from the collection outlets.
17. The method of claim 16 , wherein the affinity separation step comprises binding the central memory T cells to magnetic beads that bind specifically to T cells.
18. The method of claim 17 , wherein said DLD is performed before said affinity separation step.
19. The method of claim 13 , wherein the yield of central memory T cells expressing chimeric receptors on their surface after purification, genetic engineering and expansion is at least 10% greater than central memory T cells prepared in the same manner but not subjected to DLD.
20. The method of claim 13 , wherein the affinity separation step comprises binding the central memory T cells to magnetic beads that bind specifically to T cells.