Method for producing CD4-positive T cells from pluripotent stem cells

1. An in vitro method for inducing CD4-positive T cells, the method comprising:

(a) providing T-cells comprising a reconstituted T cell receptor (TCR) gene induced from an induced pluripotent stem cell, by a process comprising:

(i) reprogramming a T helper cell comprising the TCR gene and recognizing an antigen in a culture medium to produce an induced pluripotent stem (iPS) cell comprising the reconstituted TCR gene;

(ii) inducing CD34-positive hematopoietic progenitor cells from the pluripotent stem cells;

(iii) culturing the CD34-positive hematopoietic progenitor cells of step (ii) in the presence of FLT3L and IL-7; and

(iv) co-culturing the cells obtained from step (iii) with peripheral blood nuclear cells in presence of a mitogen, IL-7 and IL-15 to produce T cells comprising the reconstituted TCR gene, and

(b) introducing a CD4 gene or a CD4 gene product into the T cells such that CD4-positive T cells comprising the reconstituted TCR gene are obtained,

wherein the CD4-positive T-cells exhibit growth in response to the antigen stimulation, produce interferon-γ (IFN-γ) in response to the antigen stimulation, and activate dendritic cells (DCs), and wherein said induced pluripotent stem cells comprise the reconstituted TCR gene.

2. The method according to claim 1 , wherein said Step (i) comprises co-culturing pluripotent stem cells with C3H10T1/2 cells, followed by co-culturing with C3H10T1/2 cells in the presence of VEGF, FLT3L, and SCF.

3. The method according to claim 1 , wherein said Step (ii) comprises co-culturing said CD34-positive hematopoietic progenitor cells with stromal cells.

4. The method according to claim 3 , wherein said stromal cells are OP9 cells expressing Delta-1.

5. The method according to claim 1 , wherein introduction of the CD4 gene or the CD4 gene product is performed by retrovirus.

6. The method according to claim 1 , wherein said pluripotent stem cells are human iPS cells.

7. The method according to claim 1 , wherein said antigen is BCR/ABL.

8. An in vitro method for activating dendritic cells, said method comprising

(a) providing T-cells comprising a reconstituted T cell receptor (TCR) gene induced from an induced pluripotent stem cell, by a process comprising:

(i) reprogramming a T helper cell comprising the TCR gene and recognizing an antigen in a culture medium to produce an induced pluripotent stem (iPS) cell comprising the reconstituted TCR gene;

(ii) inducing CD34-positive hematopoietic progenitor cells from the pluripotent stem cells;

(iii) culturing the CD34-positive hematopoietic progenitor cells of step (ii) in the presence of FLT3L and IL-7; and

(iv) co-culturing the cells obtained from step (iii) with peripheral blood nuclear cells in presence of a mitogen, IL-7 and IL-15 to produce T cells comprising the reconstituted TCR gene, and

(b) introducing a CD4 gene or a CD4 gene product into the T cells such that CD4-positive T cells comprising the reconstituted TCR gene are obtained, and

(c) co-culturing CD4-positive T cells comprising the reconstituted TCR gene obtained from step (b) with isolated dendritic cells in vitro in the presence of said antigen,

wherein expression of the CD4 gene in the CD4-positive T-cells activate dendritic cells (DCs), exhibit growth in response to antigen stimulation, and produce interferon-γ (IFN-γ) in response to antigen stimulation, and wherein said induced pluripotent stem cells comprise the reconstituted TCR gene.

9. The method according to claim 8 , wherein said antigen is a BCR/ABL fragment.