Bioreactor System for Cell Cultivation

Abstract

The present invention relates to a novel bioreactor system for cell cultivation. More specifically, the invention relates to a compact bioreactor system which has several integrated functions and enables small scale static culture as well as scale-up rocking culture in the same bioreactor. The bioreactor system comprises tray for positioning of a cell culture bag having adjustable volume, a lid covering the cell culture bag and provided with heating function, an integrated perfusion unit, an integrated cell loading unit, and an integrated unit for automatic cell culture sampling, wherein the bioreactor system is controlled by a single control unit. The invention also relates to a method of cell culture using the bioreactor system for culture of therapeutic cells.

Claims

1. A bioreactor system for cell culture, comprising a tray for positioning of a cell culture bag having adjustable volume, a lid covering the cell culture bag and provided with heating function, an integrated perfusion unit, an integrated cell loading unit, and an integrated unit for automatic cell culture sampling, wherein the bioreactor system is controlled by a single control unit.

2. Bioreactor system according to claim 1, wherein the tray is movable and enables static as well as rocking cell culture at a desired rpm.

3. Bioreactor system according to claim 1, wherein several trays, such as 2-5, are present and stacked in a vertical direction on the bioreactor system.

4. Bioreactor system according to claim 1, wherein the volume of the cell culture bag may be increased from 50 mL to 3000 mL.

5. Bioreactor system according to claim 1, wherein the inside of the top of the lid is provided with heating elements.

6. Bioreactor system according to claim 1, wherein the integrated perfusion unit comprises a media supply bag and waste bag and respective conduits for connection to the cell bag and pumps driving said media into said bag and waste out of said bag.

7. Bioreactor system according to claim 1, wherein the bioreactor system is movable and comprises an attachable cart.

8. Bioreactor system according to claim 1, wherein the integrated cell loading unit comprises a platform assembled with compression type load-cells taking entire weight of the system.

9. Bioreactor system according to claim 1, wherein the tray(s) is/are provided with barcode reader(s) and the cell bag(s) is/are provided with barcode(s).

10. Bioreactor system according to claim 1, wherein multiple, such as 2-5, bioreactor systems are stacked on each other in vertical direction.

11. Bioreactor system according to claim 10, wherein the multiple bioreactor systems will be controlled with single control unit, with flexibility of monitoring and controlling remotely from personal computer or mobile devices.

12. Method for cell culture, comprising culturing of a starting cell culture in a bioreactor according to claim 1 in a stationary state, wherein the volume of the cell culture bag is set to 50-500 mL and the culture is heated to 37° C., and then after 1-6, preferably 3-4 days, expanding the bag volume to 1500-3000 mL and continue the culturing in room temperature and under a rocking motion for scale up of the culture, wherein both the starting and scale up culture is performed in the same cell culture bag and on the same bioreactor system.

13. Method according to claim 12, wherein the starting cell culture is selected from stem cells, immune derived cells, tumour infiltrating cells (TILs) or any other cells suitable for cell therapy.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG. 1 is a schematic view of the bioreactor system of the invention wherein the lid or cover of the cell culture bag is removed.

[0025] FIG. 2 is a schematic view of the bioreactor system as in FIG. 1 but provided with an attachable cart.

[0026] FIG. 3 is a schematic view of the bioreactor system as in FIG. 2 wherein the lid or cover is placed over the cell culture bag.

[0027] FIG. 4 is a schematic view showing several trays of the bioreactor stacked on top of each other.

[0028] FIG. 5 is a schematic view of and integrated cell loading unit of the bioreactor system.

[0029] FIG. 6 shows the lid covering the cell bag in a shape suitable for static culture of small cell cultures.

[0030] FIG. 7 shows the lid covering the cell bag in a shape suitable for rocking culture of scale-up cell cultures.

DETAILED DESCRIPTION OF THE INVENTION

[0031] The novel bioreactor of the invention provides static as well as rocking cell culture and the user may select the most appropriate option for the particular cell culture. For example static culture is usually desired for small volume start up cultures while rocking culture is desired for larger production volumes.

[0032] The invention also enables scale out from small volume to large volume by enlarging the cell bag volume, i.e. a single bag is used for both small and scale-up culture. A certain volume of the single size bag will be closed and separated from rest of the volume for small volume static culture. Once static culture phase completes, the closed small volume will be opened allowing culture to occupy up to the complete bag volume for scale-up of culture.

[0033] The bioreactor provides, inter alia, integrated rocking, perfusion and media addition as well as controlled heating of the cell culture. A new heating method is provided which will eliminate losses of small size culture due to evaporation and condensation. Environmental conditions like temperature and gases in the cell culture bag will be maintained and controlled like an incubator under the lid of the bioreactor of the invention. Unlike existing heating pad type temperature control which has the potential threat of cooking cells during static phase, the bioreactor of the invention will provide heating similar to an incubator by providing heating control with hot air circulation while maintaining air temperature in a closed environment enclosed by the lid covering the cell bag.

[0034] Furthermore the possibility of remote monitoring and controlling will reduce physical administration of the cell culture process and avoids contamination caused by entering the clean room.

[0035] FIG. 1-2 show the bioreactor system 1 in an open condition wherein the cover or lid 4 is removed and the culture bag 3 and its connections to the media feed 5 and waste bag 6 are shown. The lid 4 will be placed back over the culture bag 3 on the tray 2 to maintain temperature and restrict falling of light on culture. The tray 2 is controlled to a stationary or racking state.

[0036] As shown in FIG. 2 the compact bioreactor system can be mounted on a cart 7 for mobility. The bioreactor can be easily moved with help of the cart within or outside the cleanroom. The cart can be loaded with all necessary accessories and consumables to be used for cell culturing.

[0037] FIG. 3 shows the bioreactor placed on a cart with the lid 4 closed. The lid 4 encloses the cell culture bag 3 and rests against the tray 2 to form an enclosed space, like an incubator for the cell culture bag 3. The inside of the lid 4 is provided with controllable heating for example with hot air circulation.

[0038] The bioreactor of the invention can handle multiple patient samples at a time by tray stacking. As shown in FIG. 4 several trays may be arranged in parallel over the first tray, such as 2-5, each having the same properties as the as first tray in respect of for example rocking ability and positioning of cell bag. Stacked trays will isolate each sample with independent operational conditions. In the case of stacked trays, one common lid will be place over all present trays.

[0039] Preferably the tray 2 is provided with barcode reader and the cell bags 2 are provided with barcodes. The cell bags barcode will be recorded with patient details and tray barcode reader will read cell bag barcode for traceability of patient cells.

[0040] The compact bioreactors can also stack on each other as a standalone instrument, so that advantage of vertical space can be taken to reduce foot print.

[0041] Furthermore the bioreactor system of the invention is provided with an integrated cell loading unit 8 as shown in FIG. 5. The integrated cell loading unit 8 reduces overall size of the bioreactor system and helps monitor volume during perfusion.

[0042] During cell expansion the cells have to go through an initial static phase for 3-4 days under controlled environment of temperature and gases. In prior art static phase is performed in incubators and following cell expansion in static phase, cultured cells are taken out from the incubators and transferred from t-flask or small bags to large volume bag for scale-up. In the present invention the static culture is performed in a smaller volume of the cell culture bag 3 and the scale-up culture is performed within the same bag but an enlarged version thereof. During static culture the tray 2 will be in stationary condition and the lid 4 will be closed. During scale up culture the tray 2 will be in rocking motion and the lid 4 may be closed or opened according to the culture needs.

[0043] In FIGS. 6 and 7 it is shown how the lid 4 may control the volume of the cell culture bag 3. The small volume of the cell culture bag may be controlled by the lid 4 which may restrict the volume of the cell culture bag 3. As shown in FIG. 6, the lid 4a may be of smaller size than the regular lid 4 shown in FIG. 7. The edges of lid 4a restrict the volume of a one size, for example 2 L, bag to a smaller volume, such as 300 mL suitable for static culture. When the lid 4a is closed and placed against the cell bag 3 under pressure it will restrict the volume of the cell bag to a desired size. In FIG. 7 the lid 4 is a regular size lid without volume restricting function suitable for use during expansion of a 2 L culture. If a smaller scale-up culture than 2 L is used, such as 500-1000 mL, then a lid adapted to this culture volume will be used, i.e. a lid that restricts off the desired culture volume.

[0044] Post static culture phase, the restricted volume of bag will be released by removing lid 4a and allowing scale up to 2 L. Via tubing, the media bag 5 will fill the cell bag 3 with media and tray 2 will rock for cell growth. The waste bag 6 will via tubing collect waste from the cell bag 3 during perfusion.

[0045] During cell culture it is important to monitor cell growth and this is mainly based on pH, dissolved oxygen (DO), and cell density. pH and DO can be monitored with sensors which are not in contact with the culture, such as conventional optical sensors, but for cell density samples need to be taken periodically from the culture. In the present bioreactor an integrated auto sampling sub system will collect sample and separate each sample.