title: Combined use of the green and yellow fluorescent proteins and fluorescence-activated cell sorting to select populations of transiently transfected PC12 cells.
abstract: One of the more time-consuming procedures in the study of exogenously expressed proteins in cell lines is the selection of individual transfected clones. In recent years, green fluorescent protein variants with excitation/emission spectra matching the typical flow cytometer configurations have been generated and are in common use. We employed PC12 cells transfected with vectors encoding fluorescent proteins and a fluorescence selection procedure using a fluorescence-activated cell-sorter. In order to select the optimal co-electroporation and sorting conditions, we used the simultaneous detection of two variants of the green fluorescent protein, that possess separable emission peaks when excited at 488 nm. Using these variants and the adequate combination of band-pass filters, we were able to analyze and establish the conditions for identifying and sorting cells transfected with enhanced green fluorescent protein, that simultaneously express another plasmid of interest. Using this procedure, the cells sorted that express both plasmids exceeded 90%. The whole procedure did not alter the physiological responsiveness of the transfected cells to growth factors, and has been successfully applied to the constitutive activation of the mitogen-activated protein kinase pathway, resulting in the spontaneous differentiation of PC12 cells. Also, this procedure has been used with other set of expression vectors encoding proteins that protect PC12 cells from apoptosis caused by different stimuli. The method that we present here provides an easy and fast procedure to obtain a high proportion of positively transfected populations of PC12 cells.
authors.affiliation: Grup de Neurobiologia Molecular, Departament de Ciències Mèdiques Bàsiques, Universitat de Lleida, Avda. Rovira Roure 44, 25198, Catalonia, Lleida, Spain.
authors.forename: C
authors.initials: C
authors.lastname: Espinet
authors.forename: X
authors.initials: X
authors.lastname: Gómez-Arbonés
authors.forename: J
authors.initials: J
authors.lastname: Egea
authors.forename: J X
authors.initials: JX
authors.lastname: Comella
mesh_terms: D000818:Animals; D001426:Bacterial Proteins / Q000235:genetics*; D002454:Cell Differentiation / Q000187:drug effects / Q000502:physiology; D005434:Flow Cytometry / Q000295:instrumentation / Q000379:methods* / Q000592:standards; D017930:Genes, Reporter / Q000235:genetics*; D049452:Green Fluorescent Proteins; D007202:Indicators and Reagents / Q000378:metabolism*; D008164:Luminescent Proteins / Q000235:genetics*; D020935:MAP Kinase Signaling System / Q000187:drug effects / Q000502:physiology; D020932:Nerve Growth Factor / Q000378:metabolism / Q000494:pharmacology; D016501:Neurites / Q000187:drug effects / Q000378:metabolism / Q000648:ultrastructure; D016716:PC12 Cells / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D051381:Rats; D014162:Transfection / Q000379:methods*
chemical_list: D001426:Bacterial Proteins; D007202:Indicators and Reagents; D008164:Luminescent Proteins; C054562:yellow fluorescent protein, Bacteria; D049452:Green Fluorescent Proteins; D020932:Nerve Growth Factor