Formation of bridges and large cellular clumps in CHO-cell microcarrier cultures: Effects of agitation dimethyl sulfoxide and calf serum |
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Authors: | Michael C Borys Eleftherios T Papoutsakis |
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Institution: | (1) Department of Chemical Engineering, Northwestern University, 2145 Sheridan Road, 60208-3120 Evanston, Illinois, USA |
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Abstract: | We have investigated conditions that inhibit the tendency of CHO K1 cells to form cellular bridges between microcarriers and
dense clumps of cellular overgrowth in microcarrier cultures. Microcarrier aggregation by cellular bridge formation was found
to occur only during periods of rapid cell growth. The level of microcarrier aggregation decreased with increasing agitation
intensity. Dense masses of cellular overgrowth formed inside bridges connecting the microcarriers and in clumps that protruded
off the microcarrier surface. To replace cells that were continuously sheared from the microcarriers, cell growth occurred
preferentially in areas of overgrowth after confluent microcarriers were maintained in a serum-free medium. This ultimately
led to poor surface coverage as bare spots developed on the microcarrier away from the areas of dense cellular overgrowth.
The development of bare spots was inhibited when confluent microcarriers were maintained in medium supplemented with 1% serum.
The development of cellular overgrowth was inhibited by dimethyl sulfoxide. Thus, maintaining confluent microcarriers in medium
supplemented with 1% dimethyl sulfoxide and 1% calf serum resulted in microcarriers that appeared similar to monolayer cultures.
There was also a decrease in bridging in cultures supplemented with either 1% calf serum or 1% dimethyl sulfoxide/1% calf
serum compared to serum-free cultures. |
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Keywords: | agitation bridging calf serum cell culture Chinese hamster ovary cells dimethyl sulfoxide microcarriers |
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