title: Low‑molecular weight fucoidan inhibits the differentiation of osteoclasts and reduces osteoporosis in ovariectomized rats.
abstract: Fucoidan is a type of sulfated polysaccharide isolated from seaweed. The present study used ovariectomized Sprague‑Dawley rats, which were treated with fucoidan. The effects of fucoidan on bone metabolism, density and microarchitecture were assessed using micro‑computed tomography (CT), histomorphometric analysis, biochemical markers of bone metabolism (Serum procollagen type I N propeptide and C‑terminal telopeptide‑1) and tests of mechanical competence of the femur. In addition, the effects of low‑molecular weight fucoidan (LMWF) on in vitro cultured osteoclasts were examined, in order to determine the mechanisms underlying LMWF‑induced osteoclastic inhibition. In ovariectomized rats, LMWF increased femoral bone density. Micro‑CT scan also revealed that LMWF prevented microarchitectural deterioration and histomorphometric analysis determined that LMWF increased trabecular bone number and reduced the surface of bone resorption. In addition, LMWF reduced the high bone turnover rate, and improved the mechanical properties of the femur in ovariectomized rats. In vitro experiments revealed that LMWF inhibited the receptor activator of nuclear factor κB ligand (RANKL) and macrophage colony‑stimulating factor‑induced differentiation of RAW264.7 cells into tartrate‑resistant acid phosphatase (TRAP)‑positive osteoclasts, and reduced the bone resorption surface of the osteoclasts. Reverse transcription‑quantitative polymerase chain reaction demonstrated that LMWF inhibited mRNA expression of TRAP, matrix metallopeptidase‑9, nuclear activator of activated T‑cells 1, and osteoclast‑associated immunoglobulin‑like receptor, which are components of the signaling pathway for osteoclast differentiation. LMWF had no effect on RANK mRNA expression. In conclusion, the present study confirmed that LMWF inhibited osteoclast differentiation and bone resorption, and may be a potential treatment for osteoporosis in ovariectomized rats.
authors.affiliation: Orthopedics Department, Tianjin Hospital, Tianjin 300050, P.R. China.
authors.forename: Xin
authors.initials: X
authors.lastname: Jin
authors.affiliation: Orthopedics Department, China Academy of Traditional Chinese Medicine, Beijing 100102, P.R. China.
authors.forename: Liguo
authors.initials: L
authors.lastname: Zhu
authors.affiliation: Orthopedics Department, Tianjin Hospital, Tianjin 300050, P.R. China.
authors.forename: Xiulan
authors.initials: X
authors.lastname: Li
authors.affiliation: Orthopedics Department, Tianjin Hospital, Tianjin 300050, P.R. China.
authors.forename: Jian
authors.initials: J
authors.lastname: Jia
authors.affiliation: Orthopedics Department, Tianjin Hospital, Tianjin 300050, P.R. China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Orthopedics Department, Tianjin Hospital, Tianjin 300050, P.R. China.
authors.forename: Xiaolei
authors.initials: X
authors.lastname: Sun
authors.affiliation: Orthopedics Department, Tianjin Hospital, Tianjin 300050, P.R. China.
authors.forename: Jianxiong
authors.initials: J
authors.lastname: Ma
authors.affiliation: Orthopedics Department, Tianjin Hospital, Tianjin 300050, P.R. China.
authors.forename: Zhaojie
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Orthopedics Department, Tianjin Hospital, Tianjin 300050, P.R. China.
authors.forename: Xinlong
authors.initials: X
authors.lastname: Ma
mesh_terms: D000818:Animals; D000925:Anticoagulants / Q000737:chemistry / Q000627:therapeutic use*; D001696:Biomechanical Phenomena / Q000187:drug effects; D050071:Bone Density Conservation Agents / Q000737:chemistry / Q000627:therapeutic use*; D001862:Bone Resorption / Q000097:blood / Q000188:drug therapy / Q000473:pathology; D000071556:Cancellous Bone / Q000187:drug effects / Q000473:pathology; D002454:Cell Differentiation / Q000187:drug effects; D049109:Cell Proliferation / Q000187:drug effects; D005260:Female; D005269:Femur / Q000187:drug effects / Q000473:pathology; D051379:Mice; D010010:Osteoclasts / Q000187:drug effects* / Q000473:pathology; D010024:Osteoporosis / Q000097:blood / Q000188:drug therapy* / Q000473:pathology; D010052:Ovariectomy; D011134:Polysaccharides / Q000737:chemistry / Q000627:therapeutic use*; D000067996:RAW 264.7 Cells; D017207:Rats, Sprague-Dawley; D012624:Seaweed / Q000737:chemistry; D000071681:Tartrate-Resistant Acid Phosphatase / Q000032:analysis
chemical_list: D000925:Anticoagulants; D050071:Bone Density Conservation Agents; D011134:Polysaccharides; C007789:fucoidan; C000605511:Acp5 protein, mouse; D000071681:Tartrate-Resistant Acid Phosphatase