title: [In vitro tracing of rat bone marrow mesenchymal stem cells using the fluorescent dye CFSE].
abstract: OBJECTIVE
  To determine the optimal condition for labeling rat mesenchymal stem cells (MSCs) using the fluorescent dye CFSE and the maximum time length allowed by CFSE staining for MSC tracing in vitro.
  
  
  METHODS
  Rat MSCs were labeled with CFSE at different concentrations (2.5, 5.0, 10.0, 20.0 and 40.0 micromol/L) for 1, 5 or 10 min. The transfection efficiency and fluorescence intensity in the cells were measured by flow cytometry and fluorescence microscope to determine the optimal condition for MSC labeling. Under the optimal condition, the effect of CFSE on the growth of MSCs was evaluated by MTT assay, and flow cytometry and fluorescence microscope were used to determine the maximum time length following CFSE labeling to allow MSC tracing.
  
  
  CONCLUSIONS
  Staining with CFSE at 20.0 micromol/L for 5 min was optimal for labeling rat MSCs in vitro, which allowed detection of the MSCs as long as 21 days after the labeling without obviously affecting the cell growth (P>0.05).
authors.affiliation: Department of Hematology, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, China. lyjpxy@163.com
authors.forename: Yan-ju
authors.initials: YJ
authors.lastname: Li
authors.forename: Lan
authors.initials: L
authors.lastname: Deng
authors.forename: Rui
authors.initials: R
authors.lastname: Huang
authors.forename: Kun-yuan
authors.initials: KY
authors.lastname: Guo
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells / Q000166:cytology*; D002469:Cell Separation / Q000379:methods; D002478:Cells, Cultured; D005434:Flow Cytometry / Q000379:methods; D005452:Fluoresceins; D005456:Fluorescent Dyes; D059630:Mesenchymal Stem Cells / Q000166:cytology*; D051381:Rats; D013388:Succinimides
chemical_list: C087165:5-(6)-carboxyfluorescein diacetate succinimidyl ester; D005452:Fluoresceins; D005456:Fluorescent Dyes; D013388:Succinimides