Heterofucans from the brown seaweed Canistrocarpus cervicornis with anticoagulant and antioxidant activities.

Heterofucans from the brown seaweed Canistrocarpus cervicornis with anticoagulant and antioxidant activities.
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来自棕色海藻canistrocarpus塞维卡尼的异源剂,具有抗凝剂和抗氧化活性。

DOI:
10.3390/md9010124
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发表时间:
2011-01-24
期刊:
影响因子:
5.4
通讯作者:
Rocha HA
Rocha HA
中科院分区:
医学2区
文献类型:
--
作者:
Camara RB;Costa LS;Fidelis GP;Nobre LT;Dantas-Santos N;Cordeiro SL;Costa MS;Alves LG;Rocha HA

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岩藻聚糖是一个术语,用于命名富含硫酸化 L-岩藻糖的硫酸化多糖家族。我们通过蛋白水解消化和随后的丙酮沉淀从 Canistrocarpus cervicornis 中提取了六种岩藻聚糖。这些杂岩藻聚糖主要由岩藻糖、葡萄糖醛酸、半乳糖和硫酸盐组成。在所测定的浓度下,没有多糖能够延长凝血酶原时间(PT)。然而,所有多糖都会延长活化部分凝血活酶时间(aPTT)。四种硫酸化多糖 (CC-0.3/CC-0.5/CC-0.7/CC-1.0) 只需 0.1 mg/mL 血浆即可使 aPTT 翻倍,仅比商用低分子量肝素 Clexane® 低 1.25 倍。杂岩藻聚糖表现出总抗氧化能力、较低的羟自由基清除活性、良好的超氧自由基清除效率(CC-1.0除外)和优异的亚铁螯合能力(CC-0.3除外)。这些结果清楚地表明了C. cervicornis多糖作为抗凝血剂和抗氧化剂的有益作用。需要进一步的纯化步骤和对结构特征的额外研究以及体内实验来测试它们作为治疗剂的可行性。
Fucan is a term used to denominate a family of sulfated polysaccharides rich in sulfated l-fucose. We extracted six fucans from Canistrocarpus cervicornis by proteolytic digestion followed by sequential acetone precipitation. These heterofucans are composed mainly of fucose, glucuronic acid, galactose and sulfate. No polysaccharide was capable of prolonging prothrombin time (PT) at the concentration assayed. However, all polysaccharides prolonged activated partial thromboplastin time (aPTT). Four sulfated polysaccharides (CC-0.3/CC-0.5/CC-0.7/CC-1.0) doubled aPTT with only 0.1 mg/mL of plasma, only 1.25-fold less than Clexane®, a commercial low molecular weight heparin. Heterofucans exhibited total antioxidant capacity, low hydroxyl radical scavenging activity, good superoxide radical scavenging efficiency (except CC-1.0), and excellent ferrous chelating ability (except CC-0.3). These results clearly indicate the beneficial effect of C. cervicornis polysaccharides as anticoagulants and antioxidants. Further purification steps and additional studies on structural features as well as in vivo experiments are needed to test the viability of their use as therapeutic agents.
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