Method for polyclonal stimulation of T cells by flexible nanomatrices
The present invention provides a method polyclonal stimulation of T cells, the method comprising contacting a population of T cells with a nanomatrix, the nanomatrix comprising a) a flexible matrix, wherein said matrix is of polymeric material; and b) attached to said polymeric flexible matrix one or more polyclonal stimulatory agents which provide activation signals to the T cells; thereby activating and inducing the T cells to proliferate; wherein the nanomatrix is 1 to 500 nm in size. At least one first and one second stimulatory agents are attached to the same or to separate flexible matrices. If the stimulatory agents are attached to separate beads, fine-tuning of nanomatrices for the stimulation of the T cells is possible.
1. An in vitro method for polyclonal stimulation of T cells, the method comprising contacting a population of T cells with a nanomatrix, the nanomatrix comprising
a) a flexible matrix, wherein said matrix is of polymeric dextran material having an average molecular weight of 40,000 daltons; and
b) attached to said polymeric flexible matrix agents for polyclonal stimulation which provide activation signals to the T cells; thereby activating and inducing the T cells to proliferate, wherein the agents for polyclonal stimulation are anti-CD3 antibodies or antigen binding fragments thereof and anti-CD28 antibodies or antigen binding fragments thereof, wherein the anti-CD3 antibodies or antigen binding fragments thereof and the anti-CD28 antibodies or antigen binding fragments thereof are attached to the same flexible matrix or attached to separate flexible matrices.
2. The method according to claim 1 , wherein the nanomatrix is biologically inert with regard to alteration of the cell function.
3. The method according to claim 1 wherein at least one first and one second stimulatory agents are attached to the same flexible matrix.
4. The method according to claim 1 wherein at least one first and one second stimulatory agents are attached to separate flexible matrices.
5. The method according to claim 4 , wherein the ratio of nanomatrices to cells is larger than 500:1 allowing fine-tuning of T cell stimulation.
6. The method according to claim 1 wherein the nanomatrix is biodegradable.
7. The method according to claim 1 , wherein the nanomatrix carries magnetic, paramagnetic or superparamagnetic nano-crystals, embedded into the flexible matrix.
8. The method according to claim 1 , wherein the agent for polyclonal stimulation is attached at high density with more than 25 μg per mg nanomatrix.
9. The method according to claim 1 , wherein the stimulated T cells are Treg cells.
10. The method according to claim 1 , wherein the method is used within a closed cell culture system.
11. The method according to claim 1 , wherein said agents are antigen binding portions of an antibody.
12. The method according to claim 1 , wherein said agents are Fabs.