Growth of Three Established Cell Lies on Glass Micmders

Three established cell lines were examined for growth on a newly developed microcarrier which consists of glass beads. The cells were simultaneously examined for growth on comrnercially available microcarriers made from DEAE-dextran and from plastic. Cell yields on the glass microcarriers were comparable to the cell yields on the commercially available products. Cells grown on the glass microcarriers were easily separated from the substratum by trypsinization (as were the cells grown on the plastic substratum) while the cells grown on the DEAEdextran particles were much more trypsin resistant. After removal of cells from the glass microcarriers, the cells reattached and spread out in plastic flasks as readily as cells harvested from monolayer. Scanning electron microscopy revealed dramatic differences in the appearance of the cells grown on the glass microcarriers and cells grown on the DEAE-dextran microcarriers. On the glass micmcarriers, cells attached to the substratum through long, slender filopodia while on the DEAE-dextran microcarriers, the entire edge of the cell appeared to be in contact with the substratum. This dissimilarity in attachment could underly the difference in sensitivity to trypsin-mediated detachment. Finally, the glass microcarriers were washed after being used once and retested for their ability to support cell growth a second time. Nearly identical results were obtained with the reprocessed beads as with previously unused ones.