Natural killer cell culture medium and method for expanding and culturing natural killer cells

A natural killer cell expansion culture technology, which is applied in the field of natural killer cell culture substrate and natural killer cell expansion culture, can solve the problems of undiscussed safety, low natural killer cell expansion efficiency, and high cell purity. Achieve the effects of alleviating the cumbersome production process, enhancing cell killing activity, and enhancing cytotoxicity

Active Publication Date: 2018-05-29
TIANJIN CHANGHE BIOLOGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the above-mentioned culture methods have a certain degree of disadvantages. Among them, the method of using virus-transfected B lymphocytes and tumor cells as feeder cells to increase the amplification factor of natural killer cells is cumbersome and the safety has yet to be explored; Using the negative sorting method of immunomagnetic bead sorting system for natural killer cell culture, the production cost is high; and the method of separation kit, because the high-purity natural killer cells have a low expansion efficiency in vitro, it is still difficult to meet large-scale The needs of experimental and clinical tumor immunotherapy
Most of the current natural killer cell culture methods are difficult to meet the requirements of high cell purity, strong cytotoxicity, and high amplification multiples at the same time

Method used

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  • Natural killer cell culture medium and method for expanding and culturing natural killer cells
  • Natural killer cell culture medium and method for expanding and culturing natural killer cells
  • Natural killer cell culture medium and method for expanding and culturing natural killer cells

Examples

Experimental program
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Effect test

Embodiment 1

[0065] Example 1: Lymactin-NK antibody coating

[0066] The Lymactin-NK antibody with a concentration of 0.6mg / mL was coated on the cell culture flask, the coating condition was 37°C, and the incubation time was 2h to obtain the coated cell culture flask.

Embodiment 2

[0067] Example 2: Preparation of autologous plasma and human peripheral blood mononuclear cells

[0068] Collect peripheral blood, transfer the collected peripheral blood to a 50mL centrifuge tube, and centrifuge at 2000rmp, 20°C for 10 minutes to obtain autologous plasma; then use lymphocyte separation medium to separate and collect human peripheral blood mononuclear cells. The collected human peripheral blood mononuclear cells were washed three times with PBS buffer to obtain human peripheral blood mononuclear cells.

[0069] Wherein, the steps of separating and collecting human-derived peripheral blood mononuclear cells using lymphocyte separation medium specifically include:

[0070] 1. Add the blood sample after drawing the plasma into PBS at a ratio of 1:1, and mix well;

[0071] 2. Slowly add the diluted blood sample on the surface of the lymphocyte separation liquid, and the ratio of the diluted blood sample to the lymphocyte separation liquid is 1:1;

[0072] 3. Cen...

Embodiment 3

[0074] Embodiment 3: induction culture

[0075] Step 1: Use X-VIVO 15:AlyS505NK-AC=1:1 serum-free medium to resuspend the human peripheral blood mononuclear cells obtained in Example 2, and adjust the cell concentration in the medium to 1.5×10 6 / mL, then inoculated into the cell culture flask coated with Lymactin-NK antibody obtained in Example 1;

[0076] Step 2: Add the autologous plasma obtained in Example 2 into the cell culture flask of step 1 above, the concentration of the autologous plasma in the natural killer cell culture medium is 5%, and add cytokine: IL-2 (1000IU / mL), IL-12 (5ng / mL), IL-15 (20ng / mL) were then induced and cultured for 14 days;

[0077] Step 3: In the first 7 days of the induction culture process, perform rehydration every 3 days, and use the rehydration medium to adjust the cell density to 1.5×10 6 / mL, and supplemented with autologous plasma and IL-2, IL-12, IL-15 cytokines; after 7 days in the induction culture process, rehydration was perform...

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Abstract

The invention provides a culture matrix and multiplication culture method for natural killer cells and relates to the technical field of cell culture. The culture matrix for the natural killer cells mainly contains a serum-free culture medium, autologous plasma and cell factors. According to the multiplication culture method utilizing the culture matrix for the natural killer cells, a Lymactin-NK antibody is combined with cell factors IL-2, IL-12 and IL-15 to induce a human-derived peripheral blood mononuclear cell to release a danger signal, so that the natural killer cells are activated, and the killing activity of the cells is enhanced; and a large number of high-quality natural killer cells can be efficiently multiplied in a short period, so that the problems that a production process is tedious, the production cost is relatively high, the multiplication fold of the natural killer cells is low, the purity of the natural killer cells is low, and the mass production is difficultly realized in an existing natural killer cell culture method are effectively relieved.

Description

technical field [0001] The invention relates to the technical field of cell culture, in particular to a natural killer cell culture substrate and a natural killer cell expansion culture method. Background technique [0002] Natural killer cells (Nature Killer cells, NK) are cytotoxic lymphocytes of the body's innate immune system, which exist in lymphoid organs and peripheral tissues, and have functions such as anti-tumor, anti-infection, and immune regulation. Direct recognition and non-specific killing of tumor cells is the first barrier of the human defense system. Natural killer cells have strong cytotoxic activity, they respond very quickly to stimulating factors, and have a high intensity of immune response; at the same time, the killing activity of natural killer cells does not require antigen stimulation and is not limited by MHC molecules; in addition, natural killer cells The cells also have a strong cytokine / chemokine secretion function, which helps to initiate a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12N5/0783
CPCC12N5/0646C12N2500/90C12N2501/2302C12N2501/2312C12N2501/2315C12N2533/50
Inventor 牟春琳王秀娟李政楠
Owner TIANJIN CHANGHE BIOLOGICAL TECH
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