Oxidative Stress and Defence Mechanisms of the Freshwater Cladoceran Daphnia Longispina Exposed to UV Radiation

Overview

Journal J Photochem Photobiol B

Specialty Biology

Date 2000 Jun 3

PMID 10836541

Citations 8

Authors

M P Vega

R A Pizarro

Affiliations

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Abstract

The aim of the present study is to evaluate the occurrence of oxidative stress in the cladoceran Daphnia longispina exposed to UV-A and UV-B radiation. The activity of antioxidant enzymes and lipid peroxidation markers is investigated and the protective action of ascorbic acid determined. Results show differences in the lethality radioinduced by UV-A and UV-B. Both UV-A and UV-B exposure cause an important increase in malonaldehyde (MDA) concentration and catalase activity. Ascorbic acid addition reduces the MDA concentration, indicating that the oxidative stress caused by either UV-A or UV-B radiation can be controlled by antioxidants. The increase of the antioxidant enzymes may be a response mechanism to oxidative stress.

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