title: Differential effects of mixed lymphocyte reaction supernatant on human mesenchymal stromal cells.
abstract: The concept that mesenchymal stromal cells (MSCs), a component of the hematopoietic microenvironment, can be a target for alloreactive effector cells in the context of graft-vs-host disease has not been investigated in detail. Mixed lymphocyte reaction (MLR) supernatant was used to mimic the inflammatory milieu induced by an allogeneic immune response in vitro. In addition to phenotype and proliferation, we monitored MSC differentiation, gene expression, and support of CD34(+) hematopoietic stem and progenitor cells after priming with MLR supernatant. Priming of MSCs with MLR supernatant led to an 11-fold decrease in cobblestone area-forming cells in the 4-week coculture (p < 0.05) and a threefold decrease of colony-forming unit macrophage in the colony-forming cell assay (p < 0.05). MSC proliferation over 8 days was increased 2.5-fold (p < 0.05). Osteogenic differentiation was enhanced, while adipogenesis was concurrently suppressed. In addition, the surface expression of HLA-DR and intercellular adhesion molecule-1 was increased 20-fold (p = 0.06) and 45-fold (p < 0.05), respectively. This was associated with increased adhesion of hematopoietic stem and progenitor cells to MLR-treated MSCs. In summary, our data shed light on the dysfunction of the stromal environment during graft-vs-host disease, possibly aggravating cytopenia and leading to an enhanced immunogenicity of MSCs.
authors.affiliation: Medical Clinic and Polyclinic I, University Hospital Carl Gustav Carus, Dresden, Germany. frederick.fasslrinner@uniklinikum-dresden.de
authors.forename: Frederick
authors.initials: F
authors.lastname: Fasslrinner
authors.forename: Manja
authors.initials: M
authors.lastname: Wobus
authors.forename: Regina
authors.initials: R
authors.lastname: Duryagina
authors.forename: Katrin
authors.initials: K
authors.lastname: Müller
authors.forename: Sabine
authors.initials: S
authors.lastname: Stopp
authors.forename: Rebekka
authors.initials: R
authors.lastname: Wehner
authors.forename: Martina
authors.initials: M
authors.lastname: Rauner
authors.forename: Lorenz C
authors.initials: LC
authors.lastname: Hofbauer
authors.forename: Marc
authors.initials: M
authors.lastname: Schmitz
authors.forename: Martin
authors.initials: M
authors.lastname: Bornhäuser
mesh_terms: D002454:Cell Differentiation; D049109:Cell Proliferation; D018920:Coculture Techniques; D003470:Culture Media; D017077:Culture Media, Conditioned; D006801:Humans; D007959:Lymphocyte Culture Test, Mixed; D059630:Mesenchymal Stem Cells / Q000166:cytology*; D060888:Real-Time Polymerase Chain Reaction; D015854:Up-Regulation
chemical_list: D003470:Culture Media; D017077:Culture Media, Conditioned