title: In vitro and in vivo properties of distinct populations of amniotic fluid mesenchymal progenitor cells.
abstract: Human mesenchymal progenitor cells (MPCs) are considered to be of great promise for use in tissue repair and regenerative medicine. MPCs represent multipotent adherent cells, able to give rise to multiple mesenchymal lineages such as osteoblasts, adipocytes or chondrocytes. Recently, we identified and characterized human second trimester amniotic fluid (AF) as a novel source of MPCs. Herein, we found that early colonies of AF-MPCs consisted of two morphologically distinct adherent cell types, termed as spindle-shaped (SS) and round-shaped (RS). A detailed analysis of these two populations showed that SS-AF-MPCs expressed CD90 antigen in a higher level and exhibited a greater proliferation and differentiation potential. To characterize better the molecular identity of these two populations, we have generated a comparative proteomic map of SS-AF-MPCs and RS-AF-MPCs, identifying 25 differentially expressed proteins and 10 proteins uniquely expressed in RS-AF-MPCs. Furthermore, SS-AF-MPCs exhibited significantly higher migration ability on extracellular matrices, such as fibronectin and laminin in vitro, compared to RS-AF-MPCs and thus we further evaluated SS-AF-MPCs for potential use as therapeutic tools in vivo. Therefore, we tested whether GFP-lentiviral transduced SS-AF-MPCs retained their stem cell identity, proliferation and differentiation potential. GFP-SS-AF-MPCs were then successfully delivered into immunosuppressed mice, distributed in different tissues and survived longterm in vivo. In summary, these results demonstrated that AF-MPCs consisted of at least two different MPC populations. In addition, SS-AF-MPCs, isolated based on their colony morphology and CD90 expression, represented the only MPC population that can be expanded easily in culture and used as an efficient tool for future in vivo therapeutic applications.
authors.affiliation: Cell and Gene Therapy Laboratory, Centre of Basic Research, Biomedical Research Foundation, Academy of Athens (BRFAA), Athens, Greece. mroubelaki@bioacademy.gr
authors.forename: Maria G
authors.initials: MG
authors.lastname: Roubelakis
authors.forename: Vasiliki
authors.initials: V
authors.lastname: Bitsika
authors.forename: Dimitra
authors.initials: D
authors.lastname: Zagoura
authors.forename: Ourania
authors.initials: O
authors.lastname: Trohatou
authors.forename: Kalliopi I
authors.initials: KI
authors.lastname: Pappa
authors.forename: Manousos
authors.initials: M
authors.lastname: Makridakis
authors.forename: Aristidis
authors.initials: A
authors.lastname: Antsaklis
authors.forename: Antonia
authors.initials: A
authors.lastname: Vlahou
authors.forename: Nicholas P
authors.initials: NP
authors.lastname: Anagnou
mesh_terms: D000653:Amniotic Fluid / Q000166:cytology*; D000818:Animals; D057134:Antibodies, Neutralizing / Q000494:pharmacology; D015415:Biomarkers / Q000378:metabolism; D002448:Cell Adhesion / Q000187:drug effects; D002454:Cell Differentiation / Q000187:drug effects; D002465:Cell Movement / Q000187:drug effects; D049109:Cell Proliferation / Q000187:drug effects; D048430:Cell Shape / Q000187:drug effects; D015180:Electrophoresis, Gel, Two-Dimensional; D053595:Embryonic Stem Cells / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D005353:Fibronectins / Q000494:pharmacology; D006801:Humans; D018960:Hyaluronan Receptors / Q000276:immunology; D006820:Hyaluronic Acid / Q000494:pharmacology; D039482:Integrin alpha5 / Q000378:metabolism; D016086:Lentivirus / Q000187:drug effects / Q000235:genetics; D045164:Mesenchymal Stem Cell Transplantation; D059630:Mesenchymal Stem Cells / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism; D051379:Mice; D016513:Mice, SCID; D010641:Phenotype; D015203:Reproducibility of Results; D018800:Thy-1 Antigens / Q000378:metabolism; D014157:Transcription Factors / Q000378:metabolism; D014161:Transduction, Genetic
chemical_list: D057134:Antibodies, Neutralizing; D015415:Biomarkers; D005353:Fibronectins; D018960:Hyaluronan Receptors; D039482:Integrin alpha5; D018800:Thy-1 Antigens; D014157:Transcription Factors; D006820:Hyaluronic Acid