Activation and expansion of T-cells using an engineered multivalent signaling platform as a research tool
First Claim
1. An in vitro method for activating or stimulating a population of T cells, the method comprising:
- contacting said population of cells with an engineered K562 cell followed by restimulation of said T cells with said engineered K562 cell, wherein said engineered K562 cell comprises;
1) an exogenous antibody that binds to CD3 or CD2, wherein the antibody is loaded onto a human Fcγ
receptor wherein the Fcγ
receptor is expressed from an expression vector in said engineered K562 cell,
2) a molecule that binds CD28 selected from the group consisting of anti-CD28 antibody, CD80, and CD86, and
3) 4-1BBL;
thereby stimulating or activating said T cells.
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Abstract
Provided are a system and methods for selectively inducing expansion of a population of T cells in the absence of exogenous growth factors, such as lymphokines, and accessory cells for research purposes. The cell based expansion system and methods permit the long-term growth of CTLs, preferably human CTLs. In addition, T cell proliferation can be induced without the need for antigen, thus providing an expanded T cell population that is polyclonal with respect to antigen reactivity. Further provided are methods for using the system and methods to screen and identify antigens related to specific diseases or conditions, tumors, autoimmune disorders, or an infectious disease or pathogen, and to identify target molecule for research purposes, or for developing a vaccine based thereon.
79 Citations
26 Claims
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1. An in vitro method for activating or stimulating a population of T cells, the method comprising:
contacting said population of cells with an engineered K562 cell followed by restimulation of said T cells with said engineered K562 cell, wherein said engineered K562 cell comprises;
1) an exogenous antibody that binds to CD3 or CD2, wherein the antibody is loaded onto a human Fcγ
receptor wherein the Fcγ
receptor is expressed from an expression vector in said engineered K562 cell,
2) a molecule that binds CD28 selected from the group consisting of anti-CD28 antibody, CD80, and CD86, and
3) 4-1BBL;
thereby stimulating or activating said T cells.- View Dependent Claims (2, 3, 4, 5)
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6. An in vitro method for maintaining T cell repertoire, the method comprising providing a population of T cells with an engineered K562 cell for a time sufficient to induce activation and subsequently expanding said T cells followed by restimulation of said T cell with said engineered K562 cell, thereby maintaining said T cell repertoire, wherein said engineered K562 cell comprises:
- 1) an exogenous antibody that binds to CD3 or wherein the antibody is loaded onto a human Fcγ
receptor wherein the Fcγ
receptor is expressed from an expression vector in said engineered K562 cell,
2) a molecule that binds CD28 selected from the group consisting of anti-CD28 antibody, CD80, and CD86, and
3) 4-1BBL, thereby maintaining said T cell repertoire. - View Dependent Claims (7)
- 1) an exogenous antibody that binds to CD3 or wherein the antibody is loaded onto a human Fcγ
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8. A method for maintaining the viability of T cells during culture, the method comprising contacting said T cells with an engineered K562 cell followed by restimulation of said T cells with said engineered K562 cell, wherein said engineered K562 cell comprises:
- 1) an exogenous antibody that binds to CD3 or wherein the antibody is loaded onto a human Fcγ
receptor wherein the Fcγ
receptor is expressed from an expression vector in said engineered K562 cell,
2) a molecule that binds CD28 selected from the group consisting of anti-CD28 antibody, CD80, and CD86, and
3) 4-1BBL, thereby maintaining the viability of said T cells during culture. - View Dependent Claims (9, 10, 11)
- 1) an exogenous antibody that binds to CD3 or wherein the antibody is loaded onto a human Fcγ
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12. An in vitro method for expanding a population of T cells, the method comprising:
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contacting said population of T cells with an engineered K562 cell followed by restimulation of said T cells with said engineered K562 cell, wherein said engineered K562 cell comprises;
1) an exogenous antibody that binds to CD3 or wherein the antibody is loaded onto a human Fcγ
receptor wherein the Fcγ
receptor is expressed from an expression vector in said engineered K562 cell,
2) a molecule that binds CD28 selected from the group consisting of anti-CD28 antibody; and
3) 4-1BBL; andculturing said T cells under conditions and time sufficient to induce cell division, wherein said contacting occurs in the absence of exogenously added cytokines, thereby expanding said population of T cells. - View Dependent Claims (13, 14)
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15. An in vitro method for expanding a population of T cells, said method comprising:
contacting said population of T cells with an engineered K562 cell followed by restimulation of said T cells with said engineered K562 cell, wherein said engineered K562 cell comprises;
1) an exogenous antibody that binds to CD3 or wherein the antibody is loaded onto a human Fcγ
receptor wherein the Fcγ
receptor is expressed from an expression vector in said engineered K562 cell,
2) a molecule that binds CD28 selected from the group consisting of anti-CD28 antibody, CD80, CD86; and
3) 4-1BBL; and
culturing said T cells under conditions and time sufficient to induce cell division thereby expanding said population of T cells.- View Dependent Claims (16, 17, 18, 19)
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20. An ex vivo method for expanding antigen specific T cells, the method comprising:
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a. contacting a population of T cells with an antigen for a time sufficient to induce activation of T cells specific to said antigen; and b. contacting said population of antigen-specific T cells ex vivo with an engineered K562 cell under conditions and for time sufficient to induce proliferation of said antigen-specific T cells followed by restimulation of said T cells with said engineered K562 cell, wherein said engineered K562 cell comprises;
1) an exogenous antibody that binds to CD3 or CD2, wherein the antibody is loaded onto a human Fcγ
receptor wherein the Fcγ
receptor is expressed from an expression vector in said engineered K562 cell,
2) a molecule that binds CD28 selected from the group consisting of anti-CD28 antibody, CD80, and CD86; and
3) 4-1BBL, thereby expanding said antigen specific T cells.
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21. An in vitro method of activating antigen specific T cells, the method comprising contacting T cells with an antigen and an engineered K562 cell under conditions and for time sufficient to induce activation of T cells specific to said antigen followed by restimulation of said T cells with said engineered K562 cell, wherein said engineered K562 cell comprises:
- 1) an exogenous antibody that binds to CD3 or CD2,
2) a molecule that binds CD28 selected from the group consisting of anti-CD28, CD80, and CD86; and
3) 4-1BBL, thereby activating said antigen specific T cells. - View Dependent Claims (22, 23, 24, 25, 26)
- 1) an exogenous antibody that binds to CD3 or CD2,
Specification