Antioxidative capacity and enzyme activity in Haematococcus pluvialis cells exposed to superoxide free radicals
文献类型：CNKI期刊论文
| 作者 | Liu JG(刘建国); Zhang XL(张晓丽); Sun YH(孙延红); Lin W(林伟) |
| 发表日期 | 2010-02-15 |
| 出处 | Chinese Journal of Oceanology and Limnology
 |
| 关键词 | astaxanthin Haematococcus pluvialis lipid peroxidation reactive oxygen species (ROS) |
| 英文摘要 | The antioxidative capacity of astaxanthin and enzyme activity of reactive oxygen eliminating enzymes such as superoxide dismutase (SOD),peroxidase (POD),catalase (CAT) and ascorbate peroxidase (APX) were studied in three cell types of Haematococcus pluvialis exposed to high concentrations of a superoxide anion radical (O2ˉ).The results show that defensive enzymes and astaxanthin-related mechanisms were both active in H.pluvialis during exposure to reactive oxygen species (ROS) such as Oˉ2.Astaxanthin reacted with ROS much faster than did the protective enzymes,and had the strongest antioxidative capacity to protect against lipid peroxidation.The defensive mechanisms varied significantly between the three cell types and were related to the level of astaxanthin that had accumulated in those cells.Astaxanthin-enriched red cells had the strongest antioxidative capacity,followed by brown cells,and astaxanthin-deficient green cells.Although there was no significant increase in expression of protective enzymes,the malondialdehyde (MDA) content in red cells was sustained at a low level because of the antioxidative effect of astaxanthin,which quenched Oˉ2 before the protective enzymes could act.In green cells,astaxanthin is very low or absent;therefore,scavenging of ROS is inevitably reliant on antioxidative enzymes.Accordingly,in green cells,these enzymes play the leading role in scavenging ROS,and the expression of these enzymes is rapidly increased to reduce excessive ROS.However,because ROS were constantly increased in this study,the enhance enzyme activity in the green cells was not able to repair the ROS damage,leading to elevated MDA content.Of the four defensive enzymes measured in astaxanthin-deficient green cells,SOD eliminates Oˉ2,POD eliminates H2O2,which is a by-product of SOD activity,and APX and CAT are then initiated to scavenge excessive ROS. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | Supported by the National High Technology Research and Development Program of China (863 Program) (No. 2008AA09Z403) ; the Special Project for Marine Public Welfare Industry (No.200705010) ; the National Natural Science Foundation of China (No. 30771638) |
| 卷 | v.28期:01页:3-11 |
| 语种 | 英文; |
| 分类号 | Q946 |
| ISSN号 | 0254-4059 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/192245]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.ResearchandDevelopmentCenterofMarineBiotechnology,InstituteofOceanology,ChineseAcademyofSciences 2.GraduateUniversityofChineseAcademyofSciences |
| 推荐引用方式 GB/T 7714 | Liu JG,Zhang XL,Sun YH,et al. Antioxidative capacity and enzyme activity in Haematococcus pluvialis cells exposed to superoxide free radicals. 2010. |
入库方式： OAI收割
来源：海洋研究所
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