Surface immobilization of anchorage‐dependent mammalian cells

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Abstract
Anchorage‐dependent HeLa cells were successfully cultured on two fibrous materials (A07 and R100) with porosities of 75–125 and 40 μm, void fractions of 92% and 81%, and fiber diameters of 7.6 and 10.2 μm, respectively, in 100‐mL spinner flasks and 2‐L stirred tank bioreactors. The matrix was formed into a fixed vertical spiral configuration. All cultures displayed rapid (≤2–3 h) attachment of inoculated cells (≥95%) to the matrix, uniform coverage of the immobilizing area with viable cells, and no significant amount of cell debris in the medium. Spinner flask cultures indicated that the denser material R100 showed better results in terms of final cell density. The growth of HeLa cells on material R100 in both culture systems was similar to that observed in tissue culture dishes (specific growth rate ∼0.03–0.04 h−1, maximum cell density of 8 × 106–9 × 106 cells · mL−1, and yields of 0.4 × 108 cells · mM−1 on glucose and 2 × 108−3 × 108 cells · mM−1 on glutamine). Scale‐up of this culture technique in a 2‐L bioreactor under perfusion with pH and dissolved oxygen (DO) control yielded cell densities of up to 1.6 × 106 cells · mL−1. Two other anchorage‐dependent mammalian cells (ADC) known to be cultured with difficulty in roller bottles or with micro carriers were easily grown on material R100 in spinner flasks. The performance of this culture technique was compared to other ADC culture systems.