title: Paracrine effects of haematopoietic cells on human mesenchymal stem cells.
abstract: Stem cell function decline during ageing can involve both cell intrinsic and extrinsic mechanisms. Bone and blood formation are intertwined in bone marrow, therefore haematopoietic cells and bone cells could be extrinsic factors for each other. In this study, we assessed the paracrine effects of extrinsic factors from haematopoietic cells on human mesenchymal stem cells (MSCs). Our data showed that haematopoietic cells stimulate proliferation, osteoblast differentiation and inhibit senescence of MSCs; TNF-α, PDGF-β, Wnt1, 4, 6, 7a and 10a, sFRP-3 and sFRP-5 are dominantly expressed in haematopoietic cells; the age-related increase of TNF-α in haematopoietic cells may perform as a negative factor in the interactions of haematopoietic cells on MSCs via TNF-α receptors and then activating NF-κB signaling or Wnt/β-catenin signaling to induce senescence and reduce osteoblast differentiation in MSCs. In conclusion, our data demonstrated that there are paracrine interactions of haematopoietic cells on human MSCs; immunosenescence may be one of the extrinsic mechanisms by which skeletal stem cell function decline during human skeletal ageing.
authors.affiliation: 1] Department of Orthopedic Surgery, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA [2] Harvard Stem Cell Institute, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: Shuanhu
authors.initials: S
authors.lastname: Zhou
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D001854:Bone Marrow Cells / Q000378:metabolism*; D002454:Cell Differentiation; D049109:Cell Proliferation; D016922:Cellular Senescence; D005260:Female; D020869:Gene Expression Profiling; D006412:Hematopoietic Stem Cells / Q000378:metabolism*; D006801:Humans; D008297:Male; D059630:Mesenchymal Stem Cells / Q000166:cytology* / Q000378:metabolism*; D008875:Middle Aged; D016328:NF-kappa B / Q000378:metabolism; D010006:Osteoblasts / Q000166:cytology / Q000378:metabolism; D010012:Osteogenesis; D019899:Paracrine Communication; D015398:Signal Transduction; D059467:Transcriptome; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism; D060449:Wnt Signaling Pathway; D055815:Young Adult; D051176:beta Catenin / Q000378:metabolism
chemical_list: D016328:NF-kappa B; D014409:Tumor Necrosis Factor-alpha; D051176:beta Catenin