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. 1997 Jan;150(1):99–106.

Immunobead filtration: a novel approach for the isolation and propagation of tumor cells.

P D Rye 1, H K Høifødt 1, G E Overli 1, O Fodstad 1
PMCID: PMC1858507  PMID: 9006327

Abstract

We have developed a method to facilitate the isolation and expansion of tumor cells from body fluids and tissue biopsies. Antibody-conjugated magnetic beads (immunobeads) were used to isolate tumor cells from blood, bone marrow, ascitic/pleural fluids, and enzyme-digested tissue biopsies. Filtration of the resulting cell suspension through a 20-micron nylon monofilament filter secured to the base of polystyrene 96-well strips purged the bead-rosetting cell fraction of contaminating normal cells and unbound beads. Tumor cells that bound the magnetic beads were retained on the membrane due to their increased size and concentrated into a small area (0.332 cm2), thus maintaining a high cell density. The filters provided a stable and uniform three-dimensional matrix for cell growth, with a total surface area of 1.42 cm2 available for cell attachment. The filters could be easily removed from the base of the 96-well strips to facilitate handling and transfer between culture vessels. Tumor cells grown on the filters could subsequently be harvested using trypsin/EDTA or left in situ for immunostaining with conventional immunohistochemical procedures. Filter-grown cells have shown extended passage in conventional cell culture in six cases. In two of five cases, the orthotopic implantation of confluent filters that contained approximately 10(4) cells/8 x 8 mm filter successfully produced tumors in nude mice after only 4 weeks. Our new approach may be of value in improving the success rate of generating long-term cultures from previously unproductive sources of tumor cells and thus may yield a greater variety of cell lines/strains for the study of malignant disease.

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Selected References

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