title: Human mesenchymal stromal cells express CD14 cross-reactive epitopes.
abstract: Mesenchymal stromal cells (MSCs) do not express a unique definite epitope or marker gene. As such, minimal criteria were recently established for defining multipotent MSC. These criteria include expression of CD73, CD90, CD105, and a lack of hematopoietic marker expression. However, we detected binding of a CD14 antibody on bone marrow- and placenta-derived MSC and investigated the staining of CD14 antibodies on these MSC in more detail. The MSC were isolated from human bone marrow and placenta tissue, expanded, characterized by quantitative RT-PCR, flow cytometry, and immunocytochemistry and differentiated to generate osteoblasts, chondrocytes, and adipocytes. The CD14-cross-reactive MSCs were enriched by cell sorting. Human peripheral blood mononuclear cells, fibroblasts, and hematopoietic cell lines served as controls. Utilizing four different clones of CD14 monoclonal antibodies, we found that three CD14 reagents stained the MSC. Two CD14 antibodies (HCD14 and M5E2) clearly marked the CD90(+) MSC population with distinct intensities, clone 134 620 generated a shift in flow cytometry histograms, but clone MΦP9 did not stain MSC. Transcripts encoding CD14 or the CD14 protein were not detected in MSC. We confirm that bone marrow- and placenta-derived MSC do not express CD14 and that the CD14 antibody MΦP9 discriminates between monocytes and MSC more efficiently than the other antibodies employed here. This investigation does not contradict previous work but provides a more accurate characterization of MSC.
authors: Center for Regenerative Medicine (ZRM), UKT, Eberhard-Karls University, Tübingen, Germany.
authors: Gregor A
authors: GA
authors: Pilz
authors: Julian
authors: J
authors: Braun
authors: Christine
authors: C
authors: Ulrich
authors: Tino
authors: T
authors: Felka
authors: Katrin
authors: K
authors: Warstat
authors: Manuel
authors: M
authors: Ruh
authors: Bernhard
authors: B
authors: Schewe
authors: Harald
authors: H
authors: Abele
authors: Anis
authors: A
authors: Larbi
authors: Wilhelm K
authors: WK
authors: Aicher
mesh_terms: D017667:Adipocytes / Q000166:cytology / Q000276:immunology; D000906:Antibodies / Q000276:immunology*; D001854:Bone Marrow Cells / Q000166:cytology / Q000276:immunology; D002454:Cell Differentiation; D019902:Chondrocytes / Q000166:cytology / Q000276:immunology; D003429:Cross Reactions / Q000276:immunology; D000939:Epitopes / Q000235:genetics / Q000276:immunology*; D005260:Female; D005434:Flow Cytometry; D006801:Humans; D018950:Lipopolysaccharide Receptors / Q000235:genetics / Q000276:immunology* / Q000378:metabolism; D008648:Mesoderm / Q000166:cytology / Q000276:immunology*; D009000:Monocytes / Q000276:immunology; D010006:Osteoblasts / Q000166:cytology / Q000276:immunology; D010920:Placenta / Q000166:cytology / Q000276:immunology; D011247:Pregnancy; D017154:Stromal Cells / Q000166:cytology / Q000276:immunology
chemical_list: D000906:Antibodies; D000939:Epitopes; D018950:Lipopolysaccharide Receptors