Production method for T cells or NK cells, medium for culturing T cells or NK cells, method for culturing T cells or NK cells, method for maintaining undifferentiated state of undifferentiated T cells, and growth-accelerating agent for T cells or NK cells

1. A method for producing T cells or NK cells, comprising culturing T cells or NK cells in a culture medium containing a bisbenzylisoquinoline alkaloid represented by the following formula (X-1) or formula (X-2) or a compound resulting from cleavage of one ether bond thereof or a pharmaceutically acceptable salt thereof:

R 1 and R′ 1 are each independently H or straight-chain or branched-chain alkyl having 1 to 10 carbon atoms,

R 2 , R′ 2 , R 3 , R′ 3 , R 4 , R′ 4 , R 5 , and R′ 5 are each independently H, acyl, straight-chain or branched-chain alkyl having 1 to 10 carbon atoms, and the alkyl may be interrupted by an O, N, or S heteroatom, or R 2 and R 3 , R 4 and R 5 , R′ 2 and R′ 3 , or R′ 4 and R′ 5 together represent O or S,

R 6 , R′ 6 , R 7 , and R′ 7 are each independently H, acyl, or straight-chain or branched-chain alkyl having 1 to 10 carbon atoms, and the alkyl may be interrupted by an O, N, or S heteroatom, or R 6 and R 7 or R′ 6 and R′ 7 together represent O or S, and

X 1 , X 2 , X 3 , and X 4 may be the same or different, and are each independently H, hydroxy, straight-chain or branched-chain alkyl having 1 to 10 carbon atoms, alkoxy, acyloxy, or sulfonyloxy, and each may further have a substituent, n 1 and n 3 are each independently an integer of 0 to 3, n 2 and n 4 are each independently an integer of 0 to 4, and these may be linked to each other to form a ring, wherein the culturing period is 50 days or more.

2. The production method according to claim 1 , wherein the T cells or the NK cells are T cells or NK cells for immune cell therapy.

3. The production method according to claim 1 , wherein the T cells or the NK cells are peripheral blood-derived, primary hematopoietic stem/progenitor cell-derived, or pluripotent stem cell-derived cells.

4. The production method according to claim 1 , wherein the T cells are undifferentiated T cells.

5. The production method according to claim 1 , wherein the T cells express at least one of CD4 and CD8.

6. The production method according to claim 1 , wherein the T cells are cells selected from the group consisting of helper T cells, regulatory T cells, cytotoxic T cells, naive T cells, memory T cells, and terminal effector T cells.

7. The production method according to claim 6 , wherein the regulatory T cells express FoxP3.

8. The production method according to claim 6 , wherein the memory T cells are stem cell memory T cells, central memory T cells, or effector memory T cells.

9. The production method according to claim 1 , wherein the NK cells are immature NK cells or mature NK cells.

10. The production method according to claim 1 , wherein the bisbenzylisoquinoline alkaloid or the compound resulting from cleavage of one ether bond thereof or the pharmaceutically acceptable salt thereof is at least one selected from the group consisting of berbamine, (+)-berbamine, E6-berbamine, cepharanthine, and a pharmaceutically acceptable salt thereof.

11. The production method according to claim 1 , wherein the concentration of the bisbenzylisoquinoline alkaloid or the compound resulting from cleavage of one ether bond thereof or the pharmaceutically acceptable salt thereof in the culture medium is from 0.1 nM to 10 μM.

12. The production method according to claim 1 , wherein the culture medium further contains a MAPK cascade inhibitor.

13. The production method according to claim 1 , wherein feeder cells are not contained in the culture medium.