title: Anti-L-NGFR and -CD34 monoclonal antibodies identify multipotent mesenchymal stem cells in human adipose tissue.
abstract: Stem cells hold great promise in tissue engineering for repairing tissues damaged by disease or injury. Mesenchymal stem cells (MSCs) are multipotent cells able to proliferate and differentiate into multiple mesodermal tissues such as bone, cartilage, muscle, tendon, and fat. We have previously reported that the low-affinity nerve growth factor receptor (L-NGFR or CD271) defines a subset of cells with high proliferative, clonogenic, and multipotential differentiation ability in adult bone marrow (BM). It has been recently shown that adipose tissue is an alternative source of adult multipotent stem cells and human adipose-derived stem cells, selected by plastic adherence (PA hASCs), have been extensively characterized for their functional potentials in vitro. In this study, immunoselected L-NGFR(+) and CD34(+) subpopulations have been analyzed and compared with the PA hASCs. Phenotypic profile of freshly purified subpopulations showed an enrichment in the expression of some stem cell markers; indeed, a great percentage of L-NGFR(+) cells co-expressed CD34 and CD117 antigens, whereas the endothelial-committed progenitor markers KDR and P1H12 were mainly expressed on CD34(+) cells. Differently from PA hASCs, the immunoseparated fractions showed high increments in cell proliferation, and the fibroblast colony-forming activity (CFU-F) was maintained throughout the time of culture. Furthermore, the immunoselected populations showed a greater differentiative potential toward adipocytes, osteoblasts, and chondrocyte-like cells, compared to PA hASCs. Our data suggest that both CD34(+) and L-NGFR(+) hASCs can be considered alternative candidates for tissue engineering and regenerative medicine applications.
authors.affiliation: Fondazione Matarelli, Department of Medical Pharmacology, Università degli Studi di Milano, Milan, Italy. nadiaquirici@fastwebnet.it
authors.forename: Nadia
authors.initials: N
authors.lastname: Quirici
authors.forename: Cinzia
authors.initials: C
authors.lastname: Scavullo
authors.forename: Laura
authors.initials: L
authors.lastname: de Girolamo
authors.forename: Silvia
authors.initials: S
authors.lastname: Lopa
authors.forename: Elena
authors.initials: E
authors.lastname: Arrigoni
authors.forename: Giorgio Lambertenghi
authors.initials: GL
authors.lastname: Deliliers
authors.forename: Anna T
authors.initials: AT
authors.lastname: Brini
mesh_terms: D050156:Adipogenesis; D000273:Adipose Tissue / Q000166:cytology*; D000328:Adult; D000911:Antibodies, Monoclonal / Q000276:immunology*; D018952:Antigens, CD34 / Q000276:immunology*; D015415:Biomarkers / Q000378:metabolism; D002454:Cell Differentiation; D002462:Cell Membrane / Q000378:metabolism; D049109:Cell Proliferation; D003114:Colony-Forming Units Assay; D005109:Extracellular Matrix / Q000378:metabolism; D005260:Female; D006025:Glycosaminoglycans / Q000378:metabolism; D006412:Hematopoietic Stem Cells / Q000166:cytology / Q000378:metabolism; D006801:Humans; D016130:Immunophenotyping; D059630:Mesenchymal Stem Cells / Q000166:cytology* / Q000378:metabolism; D039902:Multipotent Stem Cells / Q000166:cytology* / Q000378:metabolism; D020800:Receptor, Nerve Growth Factor / Q000276:immunology*; D013347:Subcellular Fractions / Q000378:metabolism
chemical_list: D000911:Antibodies, Monoclonal; D018952:Antigens, CD34; D015415:Biomarkers; D006025:Glycosaminoglycans; D020800:Receptor, Nerve Growth Factor