Industrial preparations of natural killer (NK) cells and injections containing NK cells
An industrial preparation of natural killer cells (NKs) is produced by: using umbilical cord blood and peripheral blood from legitimate sources as raw materials, obtaining stem cells by a method for extracting and separating karyocytes, or using FICOLL® or PERCOLL® density gradient media centrifugation to isolate and screen out karyocytes; diluting the above-mentioned karyocytes with cell culture medium, adding interferon, interleukin, CD3 antibody, and human albumin, loading them together into a bioreactor for perfusion culture, and then performing multiplication culture; the passage number of natural killer cells from multiplication culture is no less than 8, and the culture time is no less than 4 weeks; the markers of the natural killer cells obtained after the multiplication culture are CD3 − \CD56 + , CD16 + , CD57 + , and CD8 + , wherein CD16 + /CD56 + ≥15%, CD3 − /CD56 + ≥50%, and CD8 + /CD57 + ≥8%; then preparing an injection with a certain concentration using the cell suspension obtained by above-mentioned method.
1. A method for industrially preparing a population of natural killer (NK) cells from umbilical cord blood and/or peripheral blood, the method comprising:
obtaining human allogeneic karyocytes comprising stem cells from umbilical cord blood and/or peripheral blood by isolating the human allogeneic karyocytes using density gradient media centrifugation;
diluting the human allogeneic karyocytes in cell culture medium, wherein the cell culture medium is RPMI 1640;
adding gamma interferon (IFNγ), interleukin (IL)-7, an anti-CD3 antibody, and human albumin, to the cell culture medium,
loading the cell culture medium comprising the human allogeneic karyocytes, IFNγ, the interleukin, the anti-CD3 antibody, and the human albumin into a bioreactor or perfusion incubator for multiplication culture; and
performing multiplication culture in the cell culture medium comprising IFNγ, the interleukin, the anti-CD3 antibody, and human albumin to culture NK cells from the human allogeneic karyocytes, wherein the time of the multiplication culture is no less than 4 weeks;
thereby producing the population of NK cells, wherein at least 15% of the NK cells in the population are CD16 + /CD56 + , at least 50% of the NK cells in the population are CD3 − /CD56 + , and at least 8% of the NK cells in the population are CD8 + /CD57 + .
2. The method according to claim 1 , wherein the cell culture medium is serum-free RPMI 1640.
3. The method according to claim 1 , wherein the temperature for multiplication culture is 37° C.
4. The method according to claim 1 , wherein the multiplication culture is carried out in the bioreactor.
5. The method according to claim 1 , wherein human cord blood serum and/or human peripheral blood serum is also included in the cell culture medium loaded into the bioreactor.
6. The method according to claim 1 , further comprising preparing a composition comprising a cell suspension of the NK cells from the multiplication culture.
7. The method according to claim 1 , wherein no cell culture medium is added again for two days after loading the cell culture medium including the human allogeneic karyocytes, the IFNγ, the IL-7, the anti-CD3 antibody, and the human albumin into the bioreactor or the perfusion incubator.