Fucans, but not fucomannoglucuronans, determine the biological activities of sulfated polysaccharides from Laminaria saccharina brown seaweed
Diego O Croci, Albana Cumashi, Natalia A Ushakova, Marina E Preobrazhenskaya, Antonio Piccoli, Licia Totani, Nadezhda E Ustyuzhanina, Maria I Bilan, Anatolii I Usov, Alexey A Grachev, Galina E Morozevich, Albert E Berman, Craig J Sanderson, Maeve Kelly, Patrizia Di Gregorio, Cosmo Rossi, Nicola Tinari, Stefano Iacobelli, Gabriel A Rabinovich, Nikolay E Nifantiev, Consorzio Interuniversitario Nazionale per la Bio-Oncologia (CINBO), Italy, Diego O Croci, Albana Cumashi, Natalia A Ushakova, Marina E Preobrazhenskaya, Antonio Piccoli, Licia Totani, Nadezhda E Ustyuzhanina, Maria I Bilan, Anatolii I Usov, Alexey A Grachev, Galina E Morozevich, Albert E Berman, Craig J Sanderson, Maeve Kelly, Patrizia Di Gregorio, Cosmo Rossi, Nicola Tinari, Stefano Iacobelli, Gabriel A Rabinovich, Nikolay E Nifantiev, Consorzio Interuniversitario Nazionale per la Bio-Oncologia (CINBO), Italy
Abstract
Sulfated polysaccharides from Laminaria saccharina (new name: Saccharina latissima) brown seaweed show promising activity for the treatment of inflammation, thrombosis, and cancer; yet the molecular mechanisms underlying these properties remain poorly understood. The aim of this work was to characterize, using in vitro and in vivo strategies, the anti-inflammatory, anti-coagulant, anti-angiogenic, and anti-tumor activities of two main sulfated polysaccharide fractions obtained from L. saccharina: a) L.s.-1.0 fraction mainly consisting of O-sulfated mannoglucuronofucans and b) L.s.-1.25 fraction mainly composed of sulfated fucans. Both fractions inhibited leukocyte recruitment in a model of inflammation in rats, although L.s.-1.25 appeared to be more active than L.s.-1.0. Also, these fractions inhibited neutrophil adhesion to platelets under flow. Only fraction L.s.-1.25, but not L.s.-1.0, displayed anticoagulant activity as measured by the activated partial thromboplastin time. Investigation of these fractions in angiogenesis settings revealed that only L.s.-1.25 strongly inhibited fetal bovine serum (FBS) induced in vitro tubulogenesis. This effect correlated with a reduction in plasminogen activator inhibitor-1 (PAI-1) levels in L.s.-1.25-treated endothelial cells. Furthermore, only parent sulfated polysaccharides from L. saccharina (L.s.-P) and its fraction L.s.-1.25 were powerful inhibitors of basic fibroblast growth factor (bFGF) induced pathways. Consistently, the L.s.-1.25 fraction as well as L.s.-P successfully interfered with fibroblast binding to human bFGF. The incorporation of L.s.-P or L.s.-1.25, but not L.s.-1.0 into Matrigel plugs containing melanoma cells induced a significant reduction in hemoglobin content as well in the frequency of tumor-associated blood vessels. Moreover, i.p. administrations of L.s.-1.25, as well as L.s.-P, but not L.s.-1.0, resulted in a significant reduction of tumor growth when inoculated into syngeneic mice. Finally, L.s.-1.25 markedly inhibited breast cancer cell adhesion to human platelet-coated surfaces. Thus, sulfated fucans are mainly responsible for the anti-inflammatory, anticoagulant, antiangiogenic, and antitumor activities of sulfated polysaccharides from L. saccharina brown seaweed.
Conflict of interest statement
Competing Interests: The authors have declared that no competing interests exist.
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