title: A simple modification of the separation method reduces heterogeneity of adipose-derived stem cells.
abstract: High hopes are put into the use of mesenchymal stem cells (MSCs) in various approaches for tissue engineering and regenerative medicine. MSCs are derived from different tissues with only small differences in their phenotype or their differentiation potential, but higher differences in the cell yield. Since fat is easily accessible and contains a high amount of MSCs to be isolated, adipose-derived stem cells (ASCs) are very promising for clinical approaches. ASCs are not a completely homogeneous cell population. Our study was initiated to explore an easy and convenient method to reduce heterogeneity. We tested different isolation methods: (1) the standard isolation method for ASCs based on plastic attachment, (2) the standard method with an initial washing step after 60 min of adherence and (3) immunomagnetic isolation by 4 typical markers (CD49a, CD90, CD105 and CD271). Cells isolated by these methods were evaluated using quantitative PCR and flow cytometry as well as by their differentiation potential. Washing led to a significantly lower expression of desmin, smA and six2, and a higher expression of the stem cell markers nestin, oct-4 and sall-1, compared to standard isolated cells, while the immunomagnetically isolated cells showed no significant changes. All cells independent of the isolation method could be induced to differentiate into adipocytes and osteoblasts. Our study demonstrates that a simple washing step reduces heterogeneity of cultured ASCs according to PCR analysis, whereas the immunomagnetic isolation only showed minor advantages compared to the standard method, but the disadvantage of significantly lower cell yields in the primary isolates.
authors.affiliation: Division of Nephrology, Department of Internal Medicine III, Goethe University, Frankfurt/M., Germany. nadine_griesche@yahoo.de
authors.forename: Nadine
authors.initials: N
authors.lastname: Griesche
authors.forename: Werner
authors.initials: W
authors.lastname: Luttmann
authors.forename: Arlette
authors.initials: A
authors.lastname: Luttmann
authors.forename: Thekla
authors.initials: T
authors.lastname: Stammermann
authors.forename: Helmut
authors.initials: H
authors.lastname: Geiger
authors.forename: Patrick C
authors.initials: PC
authors.lastname: Baer
mesh_terms: D017667:Adipocytes / Q000166:cytology; D000328:Adult; D015703:Antigens, CD / Q000378:metabolism; D002454:Cell Differentiation; D002469:Cell Separation / Q000379:methods*; D000071063:Endoglin; D005260:Female; D006801:Humans; D039423:Integrin alpha1 / Q000378:metabolism; D008280:Magnetics; D008297:Male; D059630:Mesenchymal Stem Cells / Q000166:cytology*; D008875:Middle Aged; D009419:Nerve Tissue Proteins / Q000378:metabolism; D010006:Osteoblasts; D011956:Receptors, Cell Surface / Q000378:metabolism; D017475:Receptors, Nerve Growth Factor / Q000378:metabolism; D018800:Thy-1 Antigens / Q000378:metabolism
chemical_list: D015703:Antigens, CD; C064206:ENG protein, human; D000071063:Endoglin; D039423:Integrin alpha1; C484065:NGFR protein, human; D009419:Nerve Tissue Proteins; D011956:Receptors, Cell Surface; D017475:Receptors, Nerve Growth Factor; D018800:Thy-1 Antigens