title: Cloning of human tumor cell lines in porous glass capillary tubes: a further development of the human tumor stem cell assay.
abstract: The conventional human tumor stem cell assay for cloning tumor cells for drug sensitivity testing is limited by its inability to test drug combinations. In an attempt to overcome this limitation, we cloned tumor cell lines within porous glass capillary tubes. In contrast to plastic porous tubes, the porous glass membranes were transparent, and colony formation could be judged on an inverted microscope. Human as well as animal cell lines showed sufficient colony growth. Colonies formed within these porous tubes were homogeneously distributed, and their morphology was similar to those formed in the common stem cell assay. Cloning efficiency and colony size depended on the mean pore diameter of the glass membrane, with best colony growth within tubes with a pore diameter ranging from 8.5 nm to 14 nm. A linear relationship between number of cells seeded and number of grown colonies could be demonstrated for the cell lines MDA-231 and Colo 201. Colony growth achieved within porous glass capillary tubes is comparable to that achieved in Petri dishes and in nonporous tubes. We conclude that the porous capillary cloning system meets the basic suppositions for a quantitative cloning assay. Moreover, the porosity of the glass membrane offers the possibility of variable perfusion of medium and drugs. Further investigations will focus on various perfusion modalities and chemosensitivity testing.
authors.affiliation: Institute of Clinical Chemistry and Laboratory Medicine, University Clinic Bergmannsheil, Bochum, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Weisser
authors.forename: R
authors.initials: R
authors.lastname: Schnabel
authors.forename: P
authors.initials: P
authors.lastname: Langer
authors.forename: B
authors.initials: B
authors.lastname: Lathan
mesh_terms: D000818:Animals; D002999:Clone Cells; D005898:Glass; D006801:Humans; D014407:Tumor Cells, Cultured; D014410:Tumor Stem Cell Assay / Q000379:methods*