title: Effect of different enamel matrix derivative proteins on behavior and differentiation of endothelial cells.
abstract: OBJECTIVE
  Enamel matrix derivative (EMD) is an effective biomaterial for periodontal tissue regeneration and might stimulate angiogenesis. In order to clarify mechanisms underlying its biological activity, we separated two EMD fractions with different molecular weight protein components and investigated their effects on human umbilical vein endothelial cells (HUVECs) in vitro.
  
  
  METHODS
  Fraction Low-Molecular Weight (LMW) included proteins with a molecular weight (M.W.)<8kDa. Fraction LMW-depleted included proteins with M.W.>8kDa and lower than approximately 55kDa. The effect of EMD fractions on proliferation/viability, apoptosis, migration and expression of angiopoetin-2 (ang-2), von Willebrand factor (vWF), E-selectin, intracellular adhesion molecules 1 (ICAM-1), vascular endothelial growth factor (VEGF) receptors Flt-1 and KDR was investigated.
  
  
  RESULTS
  The proliferation/viability of HUVECs was inhibited by both LMW and LMW-depleted at concentrations 100μg/ml, whereas EMD slightly increased cell proliferation/viability. The expression of all investigated proteins was up-regulated by EMD. However, differences in the effect of EMD fractions on the protein expression were observed. The effect of LMW-depleted on the expression of ICAM-1 and E-selectin was markedly higher compared to LMW. In contrast, the expression of vWF and VEGF receptors Flt-1 and KDR was primarily affected LMW than by LMW depleted. The expression of ang-2 was not influenced by LMW and LMW-depleted. HUVECs migration was stimulated more strongly by LMW than by EMD and LMW-depleted.
  
  
  CONCLUSIONS
  Our in vitro study shows that the proteins composing EMD have different and specific biological activities and consequently have the ability to cover different aspects of EMD's biological and clinical effects.
authors.affiliation: Competence Centre of Periodontal Research, Bernhard Gottlieb School of Dentistry, Medical University of Vienna, Austria; Division of Conservative Dentistry, Periodontology and Prophylaxis, Bernhard Gottlieb School of Dentistry, Medical University of Vienna, Vienna, Austria. Electronic address: oleh.andrukhov@meduniwien.ac.at.
authors.forename: Oleh
authors.initials: O
authors.lastname: Andrukhov
authors.affiliation: Institut Straumann AG, Basel, Switzerland.
authors.forename: Anja C
authors.initials: AC
authors.lastname: Gemperli
authors.affiliation: Competence Centre of Periodontal Research, Bernhard Gottlieb School of Dentistry, Medical University of Vienna, Austria; Department of Stomatology, Xuanwu Hospital, Capital Medical University, Beijing, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Tang
authors.affiliation: Institut Straumann AG, Basel, Switzerland.
authors.forename: Nadia
authors.initials: N
authors.lastname: Howald
authors.affiliation: Institut Straumann AG, Basel, Switzerland; New York University, College of Dentistry, Department of Periodontology and Implant Dentistry, New York, NY, USA.
authors.forename: Michel
authors.initials: M
authors.lastname: Dard
authors.affiliation: Division of Orthodontics, Bernhard Gottlieb School of Dentistry, Medical University of Vienna, Vienna, Austria.
authors.forename: Frank
authors.initials: F
authors.lastname: Falkensammer
authors.affiliation: Division of Conservative Dentistry, Periodontology and Prophylaxis, Bernhard Gottlieb School of Dentistry, Medical University of Vienna, Vienna, Austria.
authors.forename: Andreas
authors.initials: A
authors.lastname: Moritz
authors.affiliation: Competence Centre of Periodontal Research, Bernhard Gottlieb School of Dentistry, Medical University of Vienna, Austria; Division of Conservative Dentistry, Periodontology and Prophylaxis, Bernhard Gottlieb School of Dentistry, Medical University of Vienna, Vienna, Austria. Electronic address: xiaohui.rausch-fan@meduniwien.ac.at.
authors.forename: Xiaohui
authors.initials: X
authors.lastname: Rausch-Fan
mesh_terms: D017209:Apoptosis / Q000187:drug effects; D002454:Cell Differentiation; D002465:Cell Movement; D049109:Cell Proliferation; D002470:Cell Survival; D002478:Cells, Cultured; D003746:Dental Enamel Proteins / Q000737:chemistry / Q000235:genetics / Q000494:pharmacology*; D042783:Endothelial Cells / Q000187:drug effects*; D004797:Enzyme-Linked Immunosorbent Assay; D005434:Flow Cytometry; D015870:Gene Expression; D006801:Humans; D066298:In Vitro Techniques; D008856:Microscopy, Fluorescence; D008970:Molecular Weight; D060888:Real-Time Polymerase Chain Reaction; D014471:Umbilical Veins / Q000166:cytology*
chemical_list: D003746:Dental Enamel Proteins; C109069:enamel matrix proteins
keywords: Cell culture; Differentiation; EMD; Endothelial cells; Migration