SYSTEMS AND METHODS FOR EXPANSION AND DIFFERENTIATION OF THERAPEUTIC CELLS IN BIOREACTORS
Systems and methods for complete medium exchange using two bioreactors and at least one external separation and retention device designed for therapeutic cells grown as aggregates, on the surface of microcarriers, or as single cells, for scalable expansion and/or directed differentiation.
1 . A method of cell expansion of therapeutic cells grown as cell aggregates, attached to the surfaces of microcarriers, or as suspended single cells, comprising:
a. suspending therapeutic cells including cell aggregates, microcarriers with attached cells, or single cells in a first medium inside a first bioreactor having a first working volume;
b. expanding or differentiating the therapeutic cells in the first bioreactor;
c. prefilling a second bioreactor having a second working volume with a second medium;
d. preconditioning process parameters for the second bioreactor containing the second medium;
e. transferring all of the first medium containing the therapeutic cells from the first bioreactor to an external device for cell concentration and medium exchange;
f. concentrating and washing the therapeutic cells in the external device using the second medium;
g. transferring the concentrated and washed therapeutic cells from the external device to the prefilled and preconditioned second bioreactor;
h. expanding or differentiating the transferred concentrated and washed therapeutic cells in the second bioreactor until a desired expansion of the therapeutic cells is complete.
2 . The method of claim 1 , further comprising:
i. prefilling a third bioreactor having a third working volume with a third medium;
j. preconditioning process parameters for the third bioreactor containing the third medium;
k. transferring all of the second medium containing the therapeutic cells from the second bioreactor to the external device;
l. concentrating and washing the therapeutic cells in the external device using the third medium;
m. transferring the concentrated and washed therapeutic cells from the external device to the prefilled and preconditioned third bioreactor; and
n. expanding or differentiating the concentrated and washed therapeutic cells in the third bioreactor until a desired expansion of the therapeutic cells is complete.
3 . The method of claim 2 , wherein the third bioreactor is the first bioreactor and the method further comprises cleaning, prefilling and preconditioning the first bioreactor prior to step i.
4 . The method of claim 1 , further including repeating steps c. through h. one or more times using one or more subsequent bioreactors and subsequent mediums in place of the second bioreactor and second medium.
5 . The method of claim 2 , wherein all of the first, second, and third working volumes are identical.
6 . The method of claim 2 , wherein the second working volume is larger than the first working volume and the third working volume is larger than the second working volume.
7 . The method of claim 4 , wherein step e. is performed using only a single external device.
8 . The method of claim 4 , wherein each time step e. is performed a different external device is used.
9 . The method of claim 1 , wherein the steps of transferring are done using pumps or a fluid pressure differential.
10 . A method of directed differentiation of therapeutic cells growing as cell aggregates, on the surfaces of microcarriers, or as suspended single cells, comprising:
a. suspending therapeutic cells including cell aggregates, microcarriers with attached cells, or single cells in a first medium in a first differentiation medium that contains first growth factors inside a first bioreactor having a first working volume;
b. prefilling a second bioreactor with a second differentiation medium and adding second growth factors that will be used in a subsequent differentiation step;
c. preconditioning process parameters for the second bioreactor;
d. transferring all of the first differentiation medium, growth factors, and therapeutic cells from the first bioreactor to an external device for cell concentration and medium exchange;
e. concentrating and washing the therapeutic cells using the second differentiation medium, to remove previous growth factors, in the external device; and
f. transferring the concentrated and washed therapeutic cells from the external device to the preconditioned second bioreactor.
11 . The method of claim 10 , further comprising:
g. prefilling a third bioreactor having a third working volume with a third medium;
h. preconditioning process parameters for the third bioreactor containing the third medium;
i. transferring all of the second medium containing the therapeutic cells from the second bioreactor to the external device;
j. concentrating and washing the therapeutic cells in the external device using the third medium; and
k. transferring the concentrated and washed therapeutic cells from the external device to the prefilled and preconditioned third bioreactor.
12 . The method of claim 11 , wherein the third bioreactor is the first bioreactor and the method further comprises cleaning, prefilling and preconditioning the first bioreactor prior to step g.
13 . The method of claim 10 , further including repeating steps b. through f. one or more times using one or more subsequent bioreactors and subsequent fresh mediums in place of the second bioreactor and second medium.
14 . The method of claim 13 , wherein all of the bioreactors used have identical working volumes.
15 . The method of claim 13 , wherein step e. is performed using only a single external device.
16 . The method of claim 13 , wherein each time step d. is performed a different external device is used.
17 . The method of claim 10 , wherein the steps of transferring are done using pumps or a fluid pressure differential.
18 . The method of claim 1 , wherein step e. transferring all of the first medium containing the therapeutic cells from the first bioreactor to an external device, comprises transferring all of the first medium containing the therapeutic cells from the first bioreactor to multiple external devices.
19 . The method of claim 18 , wherein the multiple external devices are disposed in parallel.
20 . The method of claim 10 , wherein step d. transferring all of the first differentiation medium, growth factors, and therapeutic cells from the first bioreactor to an external device, comprises transferring all of the first differentiation medium, growth factors, and therapeutic cells from the first bioreactor to multiple external devices.
21 . The method of claim 20 , wherein the multiple external devices are disposed in parallel.
22 . The method of claim 1 , wherein step c. prefilling the second bioreactor having the second working volume with the second medium and step d. preconditioning the process parameters for the second bioreactor containing the second medium, begin before step e. transferring all of the first medium containing the therapeutic cells from the first bioreactor to an external device.
23 . The method of claim 10 , wherein step b. prefilling the second bioreactor with the second differentiation medium and adding second growth factors that will be used in the subsequent differentiation step, and step c. preconditioning the process parameters for the second bioreactor, begin before step d. transferring all of the first differentiation medium, growth factors, and therapeutic cells from the first bioreactor to an external device.