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1. Research and Development Center of Marine Biotechnology Institute of Oceanology Chinese Academy of Sciences
2. Graduate University of Chinese Academy of Sciences
网络首发:2010-01-27,
纸质出版:2010
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Antioxidative capacity and enzyme activity in Haematococcus pluvialis cells exposed to superoxide free radicals[J]. 海洋湖沼学报(英文), 2010,28(1):1-9.
Liu, J., Zhang, X., Sun, Y. et al. Antioxidative capacity and enzyme activity in Haematococcus pluvialis cells exposed to superoxide free radicals., Chin. J. Ocean. Limnol. 28, 1–9 (2010). https://doi.org/10.1007/s00343-010-9244-6
Antioxidative capacity and enzyme activity in Haematococcus pluvialis cells exposed to superoxide free radicals[J]. 海洋湖沼学报(英文), 2010,28(1):1-9. DOI: 10.1007/s00343-010-9244-6.
Liu, J., Zhang, X., Sun, Y. et al. Antioxidative capacity and enzyme activity in Haematococcus pluvialis cells exposed to superoxide free radicals., Chin. J. Ocean. Limnol. 28, 1–9 (2010). https://doi.org/10.1007/s00343-010-9244-6 DOI:
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 (O 2 − ). 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 O 2 − . 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 O 2 − 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 O 2 −
POD eliminates H2O2
which is a by-product of SOD activity
and APX and CAT are then initiated to scavenge excessive ROS.
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