title: Differences in hyaluronic acid-mediated functions and signaling in arterial, microvessel, and vein-derived human endothelial cells.
abstract: Hyaluronic acid (HA), a nonsulfated glycosaminoglycan, regulates cell adhesion and migration. Small HA fragments (3-25 disaccharide units) induce neovascularization. We investigated the effect of HA and a HA fragment (10-15 disaccharide units, F1) on primary human endothelial cells (ECs). Human pulmonary ECs (HPAEC) and lung microvessel ECs (HMVEC-L) bound HA (K(d) approximately 1 and 2.3 nm, respectively) and expressed 17,780 and 16,690 HA binding sites, respectively. Both ECs showed HA-mediated cell adhesion; however, HMVEC-L was 1.5-fold better. Human umbilical vein ECs neither bound HA nor showed HA-mediated adhesion. All three ECs expressed CD44 ( approximately 110 kDa). The expression of receptor for HA-mediated motility (RHAMM) (approximately 80 kDa) was the highest in HMVEC-L, followed by HPAEC and human umbilical vein ECs. RHAMM, not CD44, bound HA in all three ECs. F1 was better than HA and stimulated a 2. 5- and 1.8-fold mitogenic response in HMVEC-L and HPAEC, respectively. Both HA and F1 induced tyrosine phosphorylation of p125(FAK), paxillin, and p42/44 ERK in HMVEC-L and HPAEC, which was blocked by an anti-RHAMM antibody. These results demonstrate that RHAMM is the functional HA receptor in primary human ECs. Heterogeneity exists among primary human ECs of different vascular origins, with respect to functional HA receptor expression and function.
authors.affiliation: Departments of Urology and Cell Biology and Anatomy, University of Miami School of Medicine, Miami, Florida 33101, USA. vlokeshw@med.miami.edu
authors.forename: V B
authors.initials: VB
authors.lastname: Lokeshwar
authors.forename: M G
authors.initials: MG
authors.lastname: Selzer
mesh_terms: D015703:Antigens, CD / Q000502:physiology; D002448:Cell Adhesion / Q000187:drug effects; D015815:Cell Adhesion Molecules / Q000378:metabolism; D002455:Cell Division / Q000187:drug effects; D002478:Cells, Cultured; D003598:Cytoskeletal Proteins / Q000378:metabolism; D004730:Endothelium, Vascular / Q000166:cytology* / Q000187:drug effects / Q000502:physiology*; D051417:Focal Adhesion Kinase 1; D051416:Focal Adhesion Protein-Tyrosine Kinases; D006801:Humans; D018960:Hyaluronan Receptors / Q000502:physiology; D006820:Hyaluronic Acid / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology*; D007700:Kinetics; D008833:Microcirculation; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism; D009844:Oligosaccharides / Q000378:metabolism / Q000494:pharmacology*; D051419:Paxillin; D010750:Phosphoproteins / Q000378:metabolism; D019000:Phosphotyrosine / Q000378:metabolism; D011505:Protein-Tyrosine Kinases / Q000378:metabolism; D011651:Pulmonary Artery; D011652:Pulmonary Circulation; D015398:Signal Transduction / Q000187:drug effects; D014471:Umbilical Veins
chemical_list: D015703:Antigens, CD; D015815:Cell Adhesion Molecules; D003598:Cytoskeletal Proteins; D018960:Hyaluronan Receptors; D009844:Oligosaccharides; C496061:PXN protein, human; D051419:Paxillin; D010750:Phosphoproteins; D019000:Phosphotyrosine; D006820:Hyaluronic Acid; D011505:Protein-Tyrosine Kinases; D051417:Focal Adhesion Kinase 1; D051416:Focal Adhesion Protein-Tyrosine Kinases; C496050:PTK2 protein, human; D020928:Mitogen-Activated Protein Kinases