title: Unbalanced effects of dermatan sulfates with different sulfation patterns on coagulation, thrombosis and bleeding.
abstract: We compared the anticoagulant, antithrombotic and bleeding effects of highly sulfated dermatan sulfates from invertebrates and their mammalian counterpart. An invertebrate dermatan sulfate containing 2-O-sulfated alpha-L-iduronic acid and 4-O-sulfated N-acetyl-beta-D-galactosamine residues is a potent anticoagulant due to a high heparin cofactor II activity. It inhibits thrombin due to the formation of a covalent complex with heparin cofactor II, as in the case of mammalian dermatan sulfate, but the effect occurs at lower concentrations for the invertebrate polysaccharide. Surprisingly, the invertebrate dermatan sulfate has a lower potency to prevent thrombus formation on an experimental model and a lower bleeding effect in rats than the mammalian dermatan sulfate. In contrast, another invertebrate dermatan sulfate, also enriched in 2-O-sulfated alpha-L-iduronic acid, but in this case sulfated at O-6 position of the N-acetyl-beta-D-galactosamine units, has no in vitro or in vivo anticoagulant activity, does not prevent thrombus formation but shows a bleeding effect similar to the mammalian glycosaminoglycan. Overall, these results demonstrate unbalanced effects of dermatan sulfates with different sulfation patterns on coagulation, thrombosis and bleeding, and raise interesting questions concerning the relationship among these three biological actions of sulfated polysaccharides.
authors.affiliation: Laboratório de Tecido Conjuntivo, Hospital Universitário Clementino Fraga Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.
authors.forename: C P
authors.initials: CP
authors.lastname: Vicente
authors.forename: P
authors.initials: P
authors.lastname: Zancan
authors.forename: L L
authors.initials: LL
authors.lastname: Peixoto
authors.forename: R
authors.initials: R
authors.lastname: Alves-Sá
authors.forename: F S
authors.initials: FS
authors.lastname: Araújo
authors.forename: P A
authors.initials: PA
authors.lastname: Mourão
authors.forename: M S
authors.initials: MS
authors.lastname: Pavão
mesh_terms: D000818:Animals; D000925:Anticoagulants / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology*; D001777:Blood Coagulation / Q000187:drug effects*; D002417:Cattle; D003871:Dermatan Sulfate / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology*; D004195:Disease Models, Animal; D004305:Dose-Response Relationship, Drug; D004347:Drug Interactions; D005260:Female; D006470:Hemorrhage / Q000139:chemically induced*; D015844:Heparin Cofactor II / Q000378:metabolism; D008297:Male; D011485:Protein Binding / Q000187:drug effects; D051381:Rats; D017208:Rats, Wistar; D013045:Species Specificity; D013917:Thrombin / Q000037:antagonists & inhibitors / Q000378:metabolism; D013927:Thrombosis / Q000188:drug therapy* / Q000517:prevention & control; D014561:Urochordata
chemical_list: D000925:Anticoagulants; D003871:Dermatan Sulfate; D015844:Heparin Cofactor II; D013917:Thrombin