Mature blood cells are derived from stem and progenitor cells and represent the end stage of an orderly process of proliferation,differentiation and maturation in the bone marrow.Cell production is of the order of 4&#...Mature blood cells are derived from stem and progenitor cells and represent the end stage of an orderly process of proliferation,differentiation and maturation in the bone marrow.Cell production is of the order of 4×10cells per day in a normal adult human and is boosted consideralby when in展开更多
Background Nowadays bone marrow represents the main source of mesenchymal stem cells (MSCs). We identified a new population of MSCs derived from human placenta and compared its biological characterization with bone ma...Background Nowadays bone marrow represents the main source of mesenchymal stem cells (MSCs). We identified a new population of MSCs derived from human placenta and compared its biological characterization with bone marrow derived MSCs.Methods Mononucleated cells (MNC) were isolated from the human placenta tissue perfusate by density gradient fractionation. Individual colonies were selected and cultured in tissue dishes. At the same time,human bone marrow derived MSCs were identified. Culture-expanded cells were characterized by immune phenotyping and cultured under conditions promoting differetiation to osteoblasts or adipocytes. The hematopoietic cytokines were assayed using reverse transcriptase polymerase chain reaction (RT-PCR). Results Human placental MSCs exhibited fibroblastoid morphology. Flow cytometric analyses showed that the placental MSC were CD29,CD44,CD73,CD105,CD166,HLA-ABC positive; but were negative for CD34,CD45,and HLA-DR. Functionally,they could be induced into adipocytes or osteocytes. Moreover,several hematopoietic cytokine mRNA was found in placenta-derived MSCs by RT-PCR analysis,including IL-6,M-CSF,Flt3-ligand and SCF. These results were consistent with the properties of bone marrow derived MSCs.Conclusion These observations implicate the postpartum human placenta as an important and novel source of multipotent stem cells that could potentially be used for investigating mesenchymal differentiation and regulation of hematopoiesis.展开更多
文摘Mature blood cells are derived from stem and progenitor cells and represent the end stage of an orderly process of proliferation,differentiation and maturation in the bone marrow.Cell production is of the order of 4×10cells per day in a normal adult human and is boosted consideralby when in
文摘Background Nowadays bone marrow represents the main source of mesenchymal stem cells (MSCs). We identified a new population of MSCs derived from human placenta and compared its biological characterization with bone marrow derived MSCs.Methods Mononucleated cells (MNC) were isolated from the human placenta tissue perfusate by density gradient fractionation. Individual colonies were selected and cultured in tissue dishes. At the same time,human bone marrow derived MSCs were identified. Culture-expanded cells were characterized by immune phenotyping and cultured under conditions promoting differetiation to osteoblasts or adipocytes. The hematopoietic cytokines were assayed using reverse transcriptase polymerase chain reaction (RT-PCR). Results Human placental MSCs exhibited fibroblastoid morphology. Flow cytometric analyses showed that the placental MSC were CD29,CD44,CD73,CD105,CD166,HLA-ABC positive; but were negative for CD34,CD45,and HLA-DR. Functionally,they could be induced into adipocytes or osteocytes. Moreover,several hematopoietic cytokine mRNA was found in placenta-derived MSCs by RT-PCR analysis,including IL-6,M-CSF,Flt3-ligand and SCF. These results were consistent with the properties of bone marrow derived MSCs.Conclusion These observations implicate the postpartum human placenta as an important and novel source of multipotent stem cells that could potentially be used for investigating mesenchymal differentiation and regulation of hematopoiesis.
