Abstract
The bioreactor conditions and cell diversity in mammalian cell cultures are often regarded as homogeneous. Recently, the influence of various kinds of heterogeneities on production rates receives increasing attention. Besides spatial gradients within the cultivation system, the variation between cell populations and the progress of the cells through the cell cycle can affect the dynamics of the cultivation process. Strong metabolic up- and down-regulations leading to variable productivities, even in exponentially growing cell cultures, have been identified in CHO cell cultivations. Consequently, scientific studies of cell cycle-related effects and metabolic regulations require experiments utilizing cell cycle-enriched subpopulations. Importantly, the enrichment procedure itself must not strongly interfere with the cell culture under investigation. Such subpopulations can be generated by near-physiological countercurrent centrifugal elutriation, which is described in the following chapter. At first, a brief overview regarding the cell cycle, currently identified effects and commonly used methods, and their applicability is outlined. Then, the experimental setup and the synchronization itself are explained.
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- CHO:
-
Chinese hamster ovary
- DNA:
-
Deoxyribonucleic acid
- DAPI:
-
4′,6-Diamidino-2-phenylindole
- FSC:
-
Forward scatter
- G1 phase:
-
Gap phase 1
- G2 phase:
-
Gap phase 2
- HEK:
-
Human embryonic kidney
- M:
-
Mitosis
- PBS:
-
Phosphate-buffered saline
- S phase:
-
Synthesis phase
- SSC:
-
Side scatter
- %sync:
-
Percentage of cells in a cell cycle phase after synchronization
- %non-sync:
-
Percentage of cells in a cell cycle phase in the preculture
- YΩ :
-
Enrichment factor
References
Brunner M, Braun P, Doppler P, Posch C, Behrens D, Herwig C, Fricke J (2017) The impact of pH inhomogeneities on CHO cell physiology and fed-batch process performance – two-compartment scale-down modelling and intracellular pH excursion. Biotechnol J 12(7):1600633. https://doi.org/10.1002/biot.201600633
Lara AR, Galindo E, Ramirez OT, Palomares LA (2006) Living with heterogeneities in bioreactors: understanding the effects of environmental gradients on cells. Mol Biotechnol 34(3):355–381. https://doi.org/10.1385/MB:34:3:355
Pilbrough W, Munro TP, Gray P (2009) Intraclonal protein expression heterogeneity in recombinant CHO cells. PLoS One 4(12):e8432. https://doi.org/10.1371/journal.pone.0008432.
Platas Barradas O, Jandt U, Becker M, Bahnemann J, Pörtner R, Zeng A-P (2015) Synchronized mammalian cell culture: Part I—A physical strategy for synchronized cultivation under physiological conditions. Biotechnol Progr 31(1):165–174. https://doi.org/10.1002/btpr.1944
Möller J, Korte K, Pörtner R, Zeng A-P, Jandt U (2018) Model-based identification of cell-cycle-dependent metabolism and putative autocrine effects in antibody producing CHO cell culture. Biotechnol Bioeng 115:2996–3008. https://doi.org/10.1002/bit.26828
Kohrman AQ, Matus DQ (2017) Divide or conquer: cell cycle regulation of invasive behavior. Trends Cell Biol 27(1):12–25. https://doi.org/10.1016/j.tcb.2016.08.003
Cooper S, Gonzalez-Hernandez M (2009) Experimental reconsideration of the utility of serum starvation as a method for synchronizing mammalian cells. Cell Biol Int 33(1):71–77. https://doi.org/10.1016/j.cellbi.2008.09.009
Alberts B, Johnson A, Lewis J, Raff M, Roberts K, Walter P (2004) Molekularbiologie der Zelle (German Edition). Wiley-VCH-Verlag GmbH, German. ISBN: 978-3-527-34072-9
Cooper S (1998) On the proposal of a G0 phase and the restriction point. FASEB J 12(3):367–373. https://doi.org/10.1096/fasebj.12.3.367
Jandt U, Platas Barradas O, Pörtner R, Zeng A-P (2014) Mammalian cell culture synchronization under physiological conditions and population dynamic simulation. Appl Microbiol Biot 98(10):4311–4319. https://doi.org/10.1007/s00253-014-5553-6
Jandt U, Platas Barradas O, Pörtner R, Zeng A-P (2015) Synchronized mammalian cell culture: Part II—population ensemble modeling and analysis for development of reproducible processes. Biotechnol Prog 31(1):175–185. https://doi.org/10.1002/btpr.2006
Castillo AE, Fuge G, Jandt U, Zeng A-P (2015) Growth kinetics and validation of near-physiologically synchronized HEK293s cultures. Eng Life Sci 15(5):509–518. https://doi.org/10.1002/elsc.201400224
Möller J, Bhat K, Riecken K, Pörtner R, Zeng A‐P, Jandt U (2019) Process‐induced cell cycle oscillations in CHO cultures: Online monitoring and model‐based investigation. Biotechnol Bioeng 116:2931–2943. https://doi.org/10.1002/bit.27124
Fuge G, Zeng A-P, Jandt U (2017) Weak cell cycle dependency but strong distortive effects of transfection with lipofectamine 2000 in near-physiologically synchronized cell culture. Eng Life Sci 17(4):348–356. https://doi.org/10.1002/elsc.201600113
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Möller, J., Korte, K., Pörtner, R., Zeng, AP., Jandt, U. (2020). Near-Physiological Cell Cycle Synchronization with Countercurrent Centrifugal Elutriation. In: Pörtner, R. (eds) Animal Cell Biotechnology. Methods in Molecular Biology, vol 2095. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-0191-4_1
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DOI: https://doi.org/10.1007/978-1-0716-0191-4_1
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