In vitro selection provides a useful approach to isolate cell sub-lines with different invasion and metastatic potentials.
Another approach is of course to isolate cells via laser capture microdissection, which is however very time consuming.
A previous study [ 18] and application notes [ 19, 26] have indicated that this approach can be applied to isolate cells secreting antibodies (about 150 kDa) or membrane associated proteins.
Unlike LCM, immunomagnetic bead-based approaches using dispersed cells fail to isolate cells adjacent to the vessels that can provide additional information about the vascular microenvironment.
A second major approach to isolate tissue cell subpopulations is affinity cell sorting of dissaggregated cells from pieces of fresh tissue.
It is apparent that these tumor stromal HSCs are not contaminants from PB: this was assured by our approach to isolate hematopoietic cells from perfused tumors and was also attested by the demonstration of different frequencies of various hematopoietic populations in tumor stroma and PB.
Our approach differs from other commercially available packages in that it does not require prior data for training purposes, and it uses a novel, fully automated approach to isolate tumour cells from stromal tissue and lymphocytic infiltrate.
We have previously utilized this approach to isolate endothelial cells from skeletal muscle, and we have rigorously tested this approach to ensure preservation of VEGFRs during enzymatic tissue dissociation 41, enrichment of endothelial cells 24, antibody specificity, antibody saturation, and monomeric antibody binding 22.
The same technique can be used to isolate cells.
Because of significant overlaps of cell populations based on epithelial (E-cadherin/EpCAM) or mesenchymal markers (CD44/vimentin), we decided to use an indirect approach to isolate E/M cell subfractions.
Thus, free-flow electrophoresis represents a satisfactory approach to isolate tumour cell subpopulations with characteristics such as high proliferative potential or increased expression of tumour antigens.
