Please note that this is an author-produced PDF of an article accepted for publication following peer review. The definitive publisher-authenticated version is available on the publisher Web site Archives of Biochemistry and Biophysics Archimer, archive institutionnelle de l’Ifremer Volume 445, Issue 1 , 1 January 2006, Pages 56-64 http://www.ifremer.fr/docelec/ http://dx.doi.org/10.1016/j.abb.2005.11.001 © 2005 Elsevier Fucoidan a sulfated polysaccharide from brown algae is a potent modulator of connective tissue proteolysis Karim Sennia,*, Farida Guenichea, Alexandrine Foucault-Bertauda, Sylvie Igondjo-Tchena, Florence Fiorettia, Sylvia Colliec-Jouaultb, Patrick Durandb, Jean Guezennecb, Gaston Godeaua,** and Didier Letourneurc a Université Paris Descartes, Faculté de Chirurgie Dentaire, EA2496 Réparations et Remodelages Oro-faciaux, Montrouge, France b IFREMER Nantes/Brest Plouzané, France c INSERM U. 698, Universités Paris VII & Paris XIII, CHU X. Bichat, Paris, France Corresponding authors : * [email protected] ** [email protected] Abstract: Fucoidans are sulfated fucosylated polymers from brown algae cell wall that exhibit some heparin/heparan sulfate properties. We previously demonstrated that these polysaccharides were able in vitro to stimulate dermal fibroblast proliferation and extracellular matrix deposition. Here, we investigated the action of a 16 kDa fucoidan fraction on parameters involved in connective tissue breakdown. This fucoidan is able to inhibit gelatinase A secretion and stromelysin 1 induction by interleukin-1β on dermal fibroblasts in culture. Furthermore, we observed that fucoidan increases the rate of association of MMPs with their specific inhibitors namely TIMPs. Using tissue sections of human skin in ex vivo experiments, we evidenced that this polysaccharide was able to minimize human leukocyte elastase activity resulting in the protection of human skin elastic fiber network against the enzymatic proteolysis due to this serine proteinase. These results suggested that fucoidan could be used for treating some inflammatory pathologies in which uncontrolled extracellular matrix degradation takes place. Keywords: Fucoidan; Glycosaminoglycans; Extracellular metalloproteinases; Leukocyte elastase; Interleukin-1β matrix remodeling; Matrix 1 ! # # F 3 33 3 3 % * " % ? H5 5 I ! H") ?β) ## 3 % ( J F H5 5 @ ?8 5 $1 5 5 IK? .L* 5 5 *$ 3 H5 5 % 3 . 55 H( # I 3 3 55 55 K@L* $"5 3 55 H5 5 55 ?? 3 # # 55 # 3 # 3 * ? 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