title: Bone marrow-derived mesenchymal stromal cells differ in their attachment to fibronectin-derived peptides from term placenta-derived mesenchymal stromal cells.
abstract: BACKGROUND
  Human mesenchymal stromal cells (MSCs) can be isolated from different sources including bone marrow and term placenta. These two populations display distinct patterns of proliferation and differentiation in vitro. Since proliferation and differentiation of cells are modulated by cell-matrix interactions, we investigated the attachment of MSCs to a set of peptide-coated surfaces and explored their interactions with peptides in suspension.
  
  
  METHODS
  Human MSCs were isolated from bone marrow and term placenta and expanded. Binding of MSCs to peptides was investigated by a cell-attachment spot assay, by blocking experiments and flow cytometry. The integrin expression pattern was explored by a transcript array and corroborated by quantitative reverse transcription polymerase chain reaction and flow cytometry.
  
  
  RESULTS
  Expanded placenta-derived MSCs (pMSCs) attached well to surfaces coated with fibronectin-derived peptides P7, P15, and P17, whereas bone marrow-derived MSCs (bmMSCs) attached to P7, but barely to P15 and P17. The binding of bmMSCs and pMSCs to the peptides was mediated by β1 integrins. In suspension, expanded bmMSCs barely bind to P7, P13, P15, and less to P14 and P17. Ex vivo, bmMSCs failed to bind P7, but displayed a weak interaction with P13, P14, and P15. In suspension, expanded pMSCs displayed binding to many peptides, including P4, P7, P13, P14, P15, and P17. The differences observed in binding of bmMSCs and pMSCs to the peptides were associated with significant differences in expression of integrin α2-, α4-, and α6-chains.
  
  
  CONCLUSIONS
  Human bmMSCs and pMSCs show distinct patterns of attachment to defined peptides and maintain differences in expression of integrins in vitro. Interactions of ex vivo bmMSCs with a given peptide yield different staining patterns compared to expanded bmMSCs in suspension. Attachment of expanded MSCs to peptides on surfaces is different from interactions of expanded MSCs with peptides in suspension. Studies designed to investigate the interactions of human MSCs with peptide-augmented scaffolds or peptides in suspension must therefore regard these differences in cell-peptide interactions.
authors: KFO273, Department of Urology, University of Tübingen Hospital, Paul Ehrlich Str. 15, 72076, Tübingen, Germany. jan.maerz@student.uni-tuebingen.de.
authors: Jan K
authors: JK
authors: Maerz
authors: KFO273, Department of Urology, University of Tübingen Hospital, Paul Ehrlich Str. 15, 72076, Tübingen, Germany. lorenzo.roncoroni@arcor.de.
authors: Lorenzo P
authors: LP
authors: Roncoroni
authors: Center for Medical Research, Department of Medicine II, University of Tübingen, Tübingen, Germany. david.goldeck@uni-tuebingen.de.
authors: David
authors: D
authors: Goldeck
authors: KFO273, Department of Urology, University of Tübingen Hospital, Paul Ehrlich Str. 15, 72076, Tübingen, Germany. tanjaabruzzese@gmx.de.
authors: Tanja
authors: T
authors: Abruzzese
authors: Interfaculty Institute of Biochemistry, University of Tübingen, Tübingen, Germany. kalbacher@uni-tuebingen.de.
authors: Hubert
authors: H
authors: Kalbacher
authors: BG Trauma Center Tübingen, University of Tübingen, Tübingen, Germany. berndrolauffs@googlemail.com.
authors: Bernd
authors: B
authors: Rolauffs
authors: BG Trauma Center Tübingen, University of Tübingen, Tübingen, Germany. PdeZwart@bgu-tuebingen.de.
authors: Peter
authors: P
authors: DeZwart
authors: Integrative Transcriptomics, Center for Bioinformatics, University of Tübingen, Tübingen, Germany. kay.nieselt@uni-tuebingen.de.
authors: Kay
authors: K
authors: Nieselt
authors: KFO273, Department of Urology, University of Tübingen Hospital, Paul Ehrlich Str. 15, 72076, Tübingen, Germany. melaniehar@gmail.com.
authors: Melanie L
authors: ML
authors: Hart
authors: Center for Medical Research, Department of Medicine II, University of Tübingen, Tübingen, Germany. gerd.klein@uni-tuebingen.de.
authors: Gerd
authors: G
authors: Klein
authors: KFO273, Department of Urology, University of Tübingen Hospital, Paul Ehrlich Str. 15, 72076, Tübingen, Germany. aicher@uni-tuebingen.de.
authors: Wilhelm K
authors: WK
authors: Aicher
mesh_terms: D000328:Adult; D000368:Aged; D001854:Bone Marrow Cells / Q000502:physiology; D002448:Cell Adhesion; D002478:Cells, Cultured; D003470:Culture Media / Q000737:chemistry; D005260:Female; D005353:Fibronectins / Q000737:chemistry; D006801:Humans; D008297:Male; D059630:Mesenchymal Stem Cells / Q000502:physiology*; D009928:Organ Specificity; D010446:Peptide Fragments / Q000737:chemistry; D010920:Placenta / Q000166:cytology; D011247:Pregnancy
chemical_list: D003470:Culture Media; D005353:Fibronectins; D010446:Peptide Fragments